[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Rafael David Tinoco]

Anyone interested in this bug, please take a look at:

https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1861941

Good summary of the issue:

https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1861941/comments/27
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1861941/comments/47
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1861941/comments/56
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1861941/comments/62

And the fix made at bcache-tools for that bug (kernel patch made to fix
this bug will asked to be removed soon, as that fix solves this issue).

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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Colin Ian King]

Perhaps we need some udev plumbing expertise to resolve this.

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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-16-generic N/A
   linux-backports-modules-4.13.0-16-generic  N/A
   linux-firmware   

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Colin Ian King]

Ignore my above 2 comments, posted these to the wrong bug.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-16-generic N/A
   linux-backports-modules-4.13.0-16-generic  N/A
   linux-firmware  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Colin Ian King]

For older releases such as bionic we have one event:

UDEV  [1304.304437] change   /devices/virtual/block/bcache0 (block)
.ID_FS_TYPE_NEW=
ACTION=change
CACHED_LABEL=
CACHED_UUID=0192e0a7-9d8e-4771-9bb1-d730a2f66a9d
DEVLINKS=/dev/bcache/by-uuid/0192e0a7-9d8e-4771-9bb1-d730a2f66a9d
DEVNAME=/dev/bcache0
DEVPATH=/devices/virtual/block/bcache0
DEVTYPE=disk
DRIVER=bcache
ID_FS_TYPE=
MAJOR=251
MINOR=0
SEQNUM=4384
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=1304237024

that creates the expected symlink.

-

For focal, instead we get two events:

UDEV  [2763.370729] change   /devices/virtual/block/bcache0 (block)
ACTION=change
DEVPATH=/devices/virtual/block/bcache0
SUBSYSTEM=block
DRIVER=bcache
CACHED_UUID=1522715e-a390-40db-8d47-06fb728014e5
CACHED_LABEL=
DEVNAME=/dev/bcache0
DEVTYPE=disk
SEQNUM=5523
USEC_INITIALIZED=2763323504
.ID_FS_TYPE_NEW=
ID_FS_TYPE=
MAJOR=251
MINOR=0
DEVLINKS=/dev/bcache/by-uuid/1522715e-a390-40db-8d47-06fb728014e5
TAGS=:systemd:

KERNEL[2784.362374] change   /devices/virtual/block/bcache0 (block)
ACTION=change
DEVPATH=/devices/virtual/block/bcache0
SUBSYSTEM=block
SYNTH_UUID=0
DEVNAME=/dev/bcache0
DEVTYPE=disk
SEQNUM=5524
MAJOR=251
MINOR=0

UDEV  [2784.433618] change   /devices/virtual/block/bcache0 (block)
ACTION=change
DEVPATH=/devices/virtual/block/bcache0
SUBSYSTEM=block
SYNTH_UUID=0
DEVNAME=/dev/bcache0
DEVTYPE=disk
SEQNUM=5524
USEC_INITIALIZED=2763323504
ID_FS_UUID=30b28bee-6a1e-423d-9d53-32c78ba5454a
ID_FS_UUID_ENC=30b28bee-6a1e-423d-9d53-32c78ba5454a
ID_FS_VERSION=1.0
ID_FS_TYPE=ext4
ID_FS_USAGE=filesystem
.ID_FS_TYPE_NEW=ext4
MAJOR=251
MINOR=0
DEVLINKS=/dev/disk/by-uuid/30b28bee-6a1e-423d-9d53-32c78ba5454a
TAGS=:systemd:

This performs:

pr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: Processing device 
(SEQNUM=5523, ACTION=change)
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: Removing watch
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: value '[dmi/id]sys_vendor' is 
'QEMU'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: value '[dmi/id]sys_vendor' is 
'QEMU'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: 
/usr/lib/udev/rules.d/60-persistent-storage.rules:109 Importing properties from 
results of builtin command 'blkid'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: Probe /dev/bcache0 
with raid and offset=0
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: 
/usr/lib/udev/rules.d/69-bcache.rules:16 Importing properties from results of 
'probe-bcache -o udev /dev/bcache0'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: Starting 
'probe-bcache -o udev /dev/bcache0'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: Successfully forked off 
'(spawn)' as PID 1912.
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: Process 
'probe-bcache -o udev /dev/bcache0' succeeded.
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: 
/usr/lib/udev/rules.d/69-bcache.rules:27 LINK 
'bcache/by-uuid/1522715e-a390-40db-8d47-06fb728014e5'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: Handling device node 
'/dev/bcache0', devnum=b251:0
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: Preserve already 
existing symlink '/dev/block/251:0' to '../bcache0'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: Creating symlink 
'/dev/bcache/by-uuid/1522715e-a390-40db-8d47-06fb728014e5' to '../../bcache0'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: sd-device: Created 
db file '/run/udev/data/b251:0' for '/devices/virtual/block/bcache0'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: Adding watch on 
'/dev/bcache0'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: sd-device: Created 
db file '/run/udev/data/b251:0' for '/devices/virtual/block/bcache0'
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: Device (SEQNUM=5523, 
ACTION=change) processed
Apr 21 14:15:22 ubuntu-focal systemd-udevd[1870]: bcache0: sd-device-monitor: 
Passed 388 byte to netlink monitor

followed by the extra action:

Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: bcache0: Processing device 
(SEQNUM=5524, ACTION=change)
Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: bcache0: Removing watch
Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: value '[dmi/id]sys_vendor' is 
'QEMU'
Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: value '[dmi/id]sys_vendor' is 
'QEMU'
Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: bcache0: 
/usr/lib/udev/rules.d/60-persistent-storage.rules:109 Importing properties from 
results of builtin command 'blkid'
Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: bcache0: Probe /dev/bcache0 
with raid and offset=0
Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: bcache0: 
/usr/lib/udev/rules.d/60-persistent-storage.rules:112 LINK 
'disk/by-uuid/30b28bee-6a1e-423d-9d53-32c78ba5454a'
Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: bcache0: Updating old name, 
'/dev/bcache/by-uuid/1522715e-a390-40db-8d47-06fb728014e5' no longer belonging 
to 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Brad Figg]

** Tags added: cscc

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-16-generic N/A
   linux-backports-modules-4.13.0-16-generic  N/A
   linux-firmware N/A
  RfKill: Error: [Errno 2] 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Andy Whitcroft]

This bug was erroneously marked for verification in bionic; verification
is not required and verification-needed-bionic is being removed.

** Tags removed: verification-needed-bionic

** Tags added: verification-done-bionic

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Brad Figg]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verification-needed-bionic' to 'verification-failed-
bionic'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-bionic

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Andy Whitcroft]

** Tags removed: verification-needed-bionic
** Tags added: kernel-fixup-verification-needed-bionic

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-16-generic N/A
   linux-backports-modules-4.13.0-16-generic  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Brad Figg]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verification-needed-bionic' to 'verification-failed-
bionic'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-bionic

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.15.0-15.16

---
linux (4.15.0-15.16) bionic; urgency=medium

  * linux: 4.15.0-15.16 -proposed tracker (LP: #1761177)

  * FFe: Enable configuring resume offset via sysfs (LP: #1760106)
- PM / hibernate: Make passing hibernate offsets more friendly

  * /dev/bcache/by-uuid links not created after reboot (LP: #1729145)
- SAUCE: (no-up) bcache: decouple emitting a cached_dev CHANGE uevent

  * Ubuntu18.04:POWER9:DD2.2 - Unable to start a KVM guest with default machine
type(pseries-bionic) complaining "KVM implementation does not support
Transactional Memory, try cap-htm=off" (kvm) (LP: #1752026)
- powerpc: Use feature bit for RTC presence rather than timebase presence
- powerpc: Book E: Remove unused CPU_FTR_L2CSR bit
- powerpc: Free up CPU feature bits on 64-bit machines
- powerpc: Add CPU feature bits for TM bug workarounds on POWER9 v2.2
- powerpc/powernv: Provide a way to force a core into SMT4 mode
- KVM: PPC: Book3S HV: Work around transactional memory bugs in POWER9
- KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode
- KVM: PPC: Book3S HV: Work around TEXASR bug in fake suspend state

  * Important Kernel fixes to be backported for Power9 (kvm) (LP: #1758910)
- powerpc/mm: Fixup tlbie vs store ordering issue on POWER9

  * Ubuntu 18.04 - IO Hang on some namespaces when running HTX with 16
namespaces  (Bolt / NVMe) (LP: #1757497)
- powerpc/64s: Fix lost pending interrupt due to race causing lost update to
  irq_happened

  * fwts-efi-runtime-dkms 18.03.00-0ubuntu1: fwts-efi-runtime-dkms kernel module
failed to build (LP: #1760876)
- [Packaging] include the retpoline extractor in the headers

linux (4.15.0-14.15) bionic; urgency=medium

  * linux: 4.15.0-14.15 -proposed tracker (LP: #1760678)

  * [Bionic] mlx4 ETH - mlnx_qos failed when set some TC to vendor
(LP: #1758662)
- net/mlx4_en: Change default QoS settings

  * AT_BASE_PLATFORM in AUXV is absent on kernels available on Ubuntu 17.10
(LP: #1759312)
- powerpc/64s: Fix NULL AT_BASE_PLATFORM when using DT CPU features

  * Bionic update to 4.15.15 stable release (LP: #1760585)
- net: dsa: Fix dsa_is_user_port() test inversion
- openvswitch: meter: fix the incorrect calculation of max delta_t
- qed: Fix MPA unalign flow in case header is split across two packets.
- tcp: purge write queue upon aborting the connection
- qed: Fix non TCP packets should be dropped on iWARP ll2 connection
- sysfs: symlink: export sysfs_create_link_nowarn()
- net: phy: relax error checking when creating sysfs link netdev->phydev
- devlink: Remove redundant free on error path
- macvlan: filter out unsupported feature flags
- net: ipv6: keep sk status consistent after datagram connect failure
- ipv6: old_dport should be a __be16 in __ip6_datagram_connect()
- ipv6: sr: fix NULL pointer dereference when setting encap source address
- ipv6: sr: fix scheduling in RCU when creating seg6 lwtunnel state
- mlxsw: spectrum_buffers: Set a minimum quota for CPU port traffic
- net: phy: Tell caller result of phy_change()
- ipv6: Reflect MTU changes on PMTU of exceptions for MTU-less routes
- net sched actions: return explicit error when tunnel_key mode is not
  specified
- ppp: avoid loop in xmit recursion detection code
- rhashtable: Fix rhlist duplicates insertion
- test_rhashtable: add test case for rhltable with duplicate objects
- kcm: lock lower socket in kcm_attach
- sch_netem: fix skb leak in netem_enqueue()
- ieee802154: 6lowpan: fix possible NULL deref in lowpan_device_event()
- net: use skb_to_full_sk() in skb_update_prio()
- net: Fix hlist corruptions in inet_evict_bucket()
- s390/qeth: free netdevice when removing a card
- s390/qeth: when thread completes, wake up all waiters
- s390/qeth: lock read device while queueing next buffer
- s390/qeth: on channel error, reject further cmd requests
- soc/fsl/qbman: fix issue in qman_delete_cgr_safe()
- dpaa_eth: fix error in dpaa_remove()
- dpaa_eth: remove duplicate initialization
- dpaa_eth: increment the RX dropped counter when needed
- dpaa_eth: remove duplicate increment of the tx_errors counter
- dccp: check sk for closed state in dccp_sendmsg()
- ipv6: fix access to non-linear packet in ndisc_fill_redirect_hdr_option()
- l2tp: do not accept arbitrary sockets
- net: ethernet: arc: Fix a potential memory leak if an optional regulator 
is
  deferred
- net: ethernet: ti: cpsw: add check for in-band mode setting with RGMII PHY
  interface
- net: fec: Fix unbalanced PM runtime calls
- net/iucv: Free memory obtained by kzalloc
- netlink: avoid a double skb free in genlmsg_mcast()
- net: Only honor ifindex in IP_PKTINFO if non-0
- net: systemport: Rewrite __bcm_sysport_tx_reclaim()
- 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.4.0-119.143

---
linux (4.4.0-119.143) xenial; urgency=medium

  * linux: 4.4.0-119.143 -proposed tracker (LP: #1760327)

  * Dell XPS 13 9360 bluetooth scan can not detect any device (LP: #1759821)
- Revert "Bluetooth: btusb: fix QCA Rome suspend/resume"

linux (4.4.0-118.142) xenial; urgency=medium

  * linux: 4.4.0-118.142 -proposed tracker (LP: #1759607)

  * Kernel panic with AWS 4.4.0-1053 / 4.4.0-1015 (Trusty) (LP: #1758869)
- x86/microcode/AMD: Do not load when running on a hypervisor

  * CVE-2018-8043
- net: phy: mdio-bcm-unimac: fix potential NULL dereference in
  unimac_mdio_probe()

linux (4.4.0-117.141) xenial; urgency=medium

  * linux: 4.4.0-117.141 -proposed tracker (LP: #1755208)

  * Xenial update to 4.4.114 stable release (LP: #1754592)
- x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels
- usbip: prevent vhci_hcd driver from leaking a socket pointer address
- usbip: Fix implicit fallthrough warning
- usbip: Fix potential format overflow in userspace tools
- x86/microcode/intel: Fix BDW late-loading revision check
- x86/retpoline: Fill RSB on context switch for affected CPUs
- sched/deadline: Use the revised wakeup rule for suspending constrained dl
  tasks
- can: af_can: can_rcv(): replace WARN_ONCE by pr_warn_once
- can: af_can: canfd_rcv(): replace WARN_ONCE by pr_warn_once
- PM / sleep: declare __tracedata symbols as char[] rather than char
- time: Avoid undefined behaviour in ktime_add_safe()
- timers: Plug locking race vs. timer migration
- Prevent timer value 0 for MWAITX
- drivers: base: cacheinfo: fix x86 with CONFIG_OF enabled
- drivers: base: cacheinfo: fix boot error message when acpi is enabled
- PCI: layerscape: Add "fsl,ls2085a-pcie" compatible ID
- PCI: layerscape: Fix MSG TLP drop setting
- mmc: sdhci-of-esdhc: add/remove some quirks according to vendor version
- fs/select: add vmalloc fallback for select(2)
- hwpoison, memcg: forcibly uncharge LRU pages
- cma: fix calculation of aligned offset
- mm, page_alloc: fix potential false positive in __zone_watermark_ok
- ipc: msg, make msgrcv work with LONG_MIN
- x86/ioapic: Fix incorrect pointers in ioapic_setup_resources()
- ACPI / processor: Avoid reserving IO regions too early
- ACPI / scan: Prefer devices without _HID/_CID for _ADR matching
- ACPICA: Namespace: fix operand cache leak
- netfilter: x_tables: speed up jump target validation
- netfilter: arp_tables: fix invoking 32bit "iptable -P INPUT ACCEPT" failed
  in 64bit kernel
- netfilter: nf_dup_ipv6: set again FLOWI_FLAG_KNOWN_NH at flowi6_flags
- netfilter: nf_ct_expect: remove the redundant slash when policy name is
  empty
- netfilter: nfnetlink_queue: reject verdict request from different portid
- netfilter: restart search if moved to other chain
- netfilter: nf_conntrack_sip: extend request line validation
- netfilter: use fwmark_reflect in nf_send_reset
- ext2: Don't clear SGID when inheriting ACLs
- reiserfs: fix race in prealloc discard
- reiserfs: don't preallocate blocks for extended attributes
- reiserfs: Don't clear SGID when inheriting ACLs
- fs/fcntl: f_setown, avoid undefined behaviour
- scsi: libiscsi: fix shifting of DID_REQUEUE host byte
- Input: trackpoint - force 3 buttons if 0 button is reported
- usb: usbip: Fix possible deadlocks reported by lockdep
- usbip: fix stub_rx: get_pipe() to validate endpoint number
- usbip: fix stub_rx: harden CMD_SUBMIT path to handle malicious input
- usbip: prevent leaking socket pointer address in messages
- um: link vmlinux with -no-pie
- vsyscall: Fix permissions for emulate mode with KAISER/PTI
- eventpoll.h: add missing epoll event masks
- x86/microcode/intel: Extend BDW late-loading further with LLC size check
- hrtimer: Reset hrtimer cpu base proper on CPU hotplug
- dccp: don't restart ccid2_hc_tx_rto_expire() if sk in closed state
- ipv6: Fix getsockopt() for sockets with default IPV6_AUTOFLOWLABEL
- ipv6: fix udpv6 sendmsg crash caused by too small MTU
- ipv6: ip6_make_skb() needs to clear cork.base.dst
- lan78xx: Fix failure in USB Full Speed
- net: igmp: fix source address check for IGMPv3 reports
- tcp: __tcp_hdrlen() helper
- net: qdisc_pkt_len_init() should be more robust
- pppoe: take ->needed_headroom of lower device into account on xmit
- r8169: fix memory corruption on retrieval of hardware statistics.
- sctp: do not allow the v4 socket to bind a v4mapped v6 address
- sctp: return error if the asoc has been peeled off in sctp_wait_for_sndbuf
- vmxnet3: repair memory leak
- net: Allow neigh contructor functions ability to modify the primary_key
- ipv4: Make neigh lookup keys for loopback/point-to-point devices be
  INADDR_ANY
   

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Seth Forshee]

** Changed in: linux (Ubuntu Bionic)
   Status: In Progress => Fix Committed

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-16-generic N/A
   linux-backports-modules-4.13.0-16-generic  N/A
   

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Is this also fixed in bionic yet?

On Tue, Apr 3, 2018 at 9:10 AM, Launchpad Bug Tracker
<1729...@bugs.launchpad.net> wrote:
> This bug was fixed in the package linux - 4.13.0-38.43
>
> ---
> linux (4.13.0-38.43) artful; urgency=medium
>
>   * linux: 4.13.0-38.43 -proposed tracker (LP: #1755762)
>
>   * Servers going OOM after updating kernel from 4.10 to 4.13 (LP: #1748408)
> - i40e: Fix memory leak related filter programming status
> - i40e: Add programming descriptors to cleaned_count
>
>   * [SRU] Lenovo E41 Mic mute hotkey is not responding (LP: #1753347)
> - platform/x86: ideapad-laptop: Increase timeout to wait for EC answer
>
>   * fails to dump with latest kpti fixes (LP: #1750021)
> - kdump: write correct address of mem_section into vmcoreinfo
>
>   * headset mic can't be detected on two Dell machines (LP: #1748807)
> - ALSA: hda/realtek - Support headset mode for ALC215/ALC285/ALC289
> - ALSA: hda - Fix headset mic detection problem for two Dell machines
> - ALSA: hda - Fix a wrong FIXUP for alc289 on Dell machines
>
>   * CIFS SMB2/SMB3 does not work for domain based DFS (LP: #1747572)
> - CIFS: make IPC a regular tcon
> - CIFS: use tcon_ipc instead of use_ipc parameter of SMB2_ioctl
> - CIFS: dump IPC tcon in debug proc file
>
>   * i2c-thunderx: erroneous error message "unhandled state: 0" (LP: #1754076)
> - i2c: octeon: Prevent error message on bus error
>
>   * hisi_sas: Add disk LED support (LP: #1752695)
> - scsi: hisi_sas: directly attached disk LED feature for v2 hw
>
>   * EDAC, sb_edac: Backport 1 patch to Ubuntu 17.10 (Fix missing DIMM sysfs
> entries with KNL SNC2/SNC4 mode) (LP: #1743856)
> - EDAC, sb_edac: Fix missing DIMM sysfs entries with KNL SNC2/SNC4 mode
>
>   * [regression] Colour banding and artefacts appear system-wide on an Asus
> Zenbook UX303LA with Intel HD 4400 graphics (LP: #1749420)
> - drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA
>
>   * DVB Card with SAA7146 chipset not working (LP: #1742316)
> - vmalloc: fix __GFP_HIGHMEM usage for vmalloc_32 on 32b systems
>
>   * [Asus UX360UA] battery status in unity-panel is not changing when battery 
> is
> being charged (LP: #1661876) // AC adapter status not detected on Asus
> ZenBook UX410UAK (LP: #1745032)
> - ACPI / battery: Add quirk for Asus UX360UA and UX410UAK
>
>   * ASUS UX305LA - Battery state not detected correctly (LP: #1482390)
> - ACPI / battery: Add quirk for Asus GL502VSK and UX305LA
>
>   * support thunderx2 vendor pmu events (LP: #1747523)
> - perf pmu: Extract function to get JSON alias map
> - perf pmu: Pass pmu as a parameter to get_cpuid_str()
> - perf tools arm64: Add support for get_cpuid_str function.
> - perf pmu: Add helper function is_pmu_core to detect PMU CORE devices
> - perf vendor events arm64: Add ThunderX2 implementation defined pmu core
>   events
> - perf pmu: Add check for valid cpuid in perf_pmu__find_map()
>
>   * lpfc.ko module doesn't work (LP: #1746970)
> - scsi: lpfc: Fix loop mode target discovery
>
>   * Ubuntu 17.10 crashes on vmalloc.c (LP: #1739498)
> - powerpc/mm/book3s64: Make KERN_IO_START a variable
> - powerpc/mm/slb: Move comment next to the code it's referring to
> - powerpc/mm/hash64: Make vmalloc 56T on hash
>
>   * ethtool -p fails to light NIC LED on HiSilicon D05 systems (LP: #1748567)
> - net: hns: add ACPI mode support for ethtool -p
>
>   * CVE-2017-17807
> - KEYS: add missing permission check for request_key() destination
>
>   * [Artful SRU] Fix capsule update regression (LP: #1746019)
> - efi/capsule-loader: Reinstate virtual capsule mapping
>
>   * [Artful/Bionic] [Config] enable EDAC_GHES for ARM64 (LP: #1747746)
> - Ubuntu: [Config] enable EDAC_GHES for ARM64
>
>   * linux-tools: perf incorrectly linking libbfd (LP: #1748922)
> - SAUCE: tools -- add ability to disable libbfd
> - [Packaging] correct disablement of libbfd
>
>   * Cherry pick c96f5471ce7d for delayacct fix (LP: #1747769)
> - delayacct: Account blkio completion on the correct task
>
>   * Error in CPU frequency reporting when nominal and min pstates are same
> (cpufreq) (LP: #1746174)
> - cpufreq: powernv: Dont assume distinct pstate values for nominal and 
> pmin
>
>   * retpoline abi files are empty on i386 (LP: #1751021)
> - [Packaging] retpoline-extract -- instantiate retpoline files for i386
> - [Packaging] final-checks -- sanity checking ABI contents
> - [Packaging] final-checks -- check for empty retpoline files
>
>   * [P9,Power NV][WSP][Ubuntu 1804] : "Kernel access of bad area " when 
> grouping
> different pmu events using perf fuzzer . (perf:) (LP: #1746225)
> - powerpc/perf: Fix oops when grouping different pmu events
>
>   * bnx2x_attn_int_deasserted3:4323 MC assert! (LP: #1715519) //
> CVE-2018-126
> - net: create skb_gso_validate_mac_len()
> - bnx2x: 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.13.0-38.43

---
linux (4.13.0-38.43) artful; urgency=medium

  * linux: 4.13.0-38.43 -proposed tracker (LP: #1755762)

  * Servers going OOM after updating kernel from 4.10 to 4.13 (LP: #1748408)
- i40e: Fix memory leak related filter programming status
- i40e: Add programming descriptors to cleaned_count

  * [SRU] Lenovo E41 Mic mute hotkey is not responding (LP: #1753347)
- platform/x86: ideapad-laptop: Increase timeout to wait for EC answer

  * fails to dump with latest kpti fixes (LP: #1750021)
- kdump: write correct address of mem_section into vmcoreinfo

  * headset mic can't be detected on two Dell machines (LP: #1748807)
- ALSA: hda/realtek - Support headset mode for ALC215/ALC285/ALC289
- ALSA: hda - Fix headset mic detection problem for two Dell machines
- ALSA: hda - Fix a wrong FIXUP for alc289 on Dell machines

  * CIFS SMB2/SMB3 does not work for domain based DFS (LP: #1747572)
- CIFS: make IPC a regular tcon
- CIFS: use tcon_ipc instead of use_ipc parameter of SMB2_ioctl
- CIFS: dump IPC tcon in debug proc file

  * i2c-thunderx: erroneous error message "unhandled state: 0" (LP: #1754076)
- i2c: octeon: Prevent error message on bus error

  * hisi_sas: Add disk LED support (LP: #1752695)
- scsi: hisi_sas: directly attached disk LED feature for v2 hw

  * EDAC, sb_edac: Backport 1 patch to Ubuntu 17.10 (Fix missing DIMM sysfs
entries with KNL SNC2/SNC4 mode) (LP: #1743856)
- EDAC, sb_edac: Fix missing DIMM sysfs entries with KNL SNC2/SNC4 mode

  * [regression] Colour banding and artefacts appear system-wide on an Asus
Zenbook UX303LA with Intel HD 4400 graphics (LP: #1749420)
- drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA

  * DVB Card with SAA7146 chipset not working (LP: #1742316)
- vmalloc: fix __GFP_HIGHMEM usage for vmalloc_32 on 32b systems

  * [Asus UX360UA] battery status in unity-panel is not changing when battery is
being charged (LP: #1661876) // AC adapter status not detected on Asus
ZenBook UX410UAK (LP: #1745032)
- ACPI / battery: Add quirk for Asus UX360UA and UX410UAK

  * ASUS UX305LA - Battery state not detected correctly (LP: #1482390)
- ACPI / battery: Add quirk for Asus GL502VSK and UX305LA

  * support thunderx2 vendor pmu events (LP: #1747523)
- perf pmu: Extract function to get JSON alias map
- perf pmu: Pass pmu as a parameter to get_cpuid_str()
- perf tools arm64: Add support for get_cpuid_str function.
- perf pmu: Add helper function is_pmu_core to detect PMU CORE devices
- perf vendor events arm64: Add ThunderX2 implementation defined pmu core
  events
- perf pmu: Add check for valid cpuid in perf_pmu__find_map()

  * lpfc.ko module doesn't work (LP: #1746970)
- scsi: lpfc: Fix loop mode target discovery

  * Ubuntu 17.10 crashes on vmalloc.c (LP: #1739498)
- powerpc/mm/book3s64: Make KERN_IO_START a variable
- powerpc/mm/slb: Move comment next to the code it's referring to
- powerpc/mm/hash64: Make vmalloc 56T on hash

  * ethtool -p fails to light NIC LED on HiSilicon D05 systems (LP: #1748567)
- net: hns: add ACPI mode support for ethtool -p

  * CVE-2017-17807
- KEYS: add missing permission check for request_key() destination

  * [Artful SRU] Fix capsule update regression (LP: #1746019)
- efi/capsule-loader: Reinstate virtual capsule mapping

  * [Artful/Bionic] [Config] enable EDAC_GHES for ARM64 (LP: #1747746)
- Ubuntu: [Config] enable EDAC_GHES for ARM64

  * linux-tools: perf incorrectly linking libbfd (LP: #1748922)
- SAUCE: tools -- add ability to disable libbfd
- [Packaging] correct disablement of libbfd

  * Cherry pick c96f5471ce7d for delayacct fix (LP: #1747769)
- delayacct: Account blkio completion on the correct task

  * Error in CPU frequency reporting when nominal and min pstates are same
(cpufreq) (LP: #1746174)
- cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin

  * retpoline abi files are empty on i386 (LP: #1751021)
- [Packaging] retpoline-extract -- instantiate retpoline files for i386
- [Packaging] final-checks -- sanity checking ABI contents
- [Packaging] final-checks -- check for empty retpoline files

  * [P9,Power NV][WSP][Ubuntu 1804] : "Kernel access of bad area " when grouping
different pmu events using perf fuzzer . (perf:) (LP: #1746225)
- powerpc/perf: Fix oops when grouping different pmu events

  * bnx2x_attn_int_deasserted3:4323 MC assert! (LP: #1715519) //
CVE-2018-126
- net: create skb_gso_validate_mac_len()
- bnx2x: disable GSO where gso_size is too big for hardware

  * Ubuntu16.04.03: ISAv3 initialize MMU registers before setting partition
table (LP: #1736145)
- powerpc/64s: Initialize ISAv3 MMU registers before setting partition table

  * powerpc/powernv: Flush console before platform error reboot (LP: #1735159)
- 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Xenial verified.

root@ubuntu:~# lsb_release -rd
Description:Ubuntu 16.04.4 LTS
Release:16.04
root@ubuntu:~# uname -a
Linux ubuntu 4.4.0-117-generic #141-Ubuntu SMP Tue Mar 13 11:58:07 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux
root@ubuntu:~# apt-cache policy linux-image-virtual
linux-image-virtual:
  Installed: 4.4.0.117.123
  Candidate: 4.4.0.117.123
  Version table:
 *** 4.4.0.117.123 500
500 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages
100 /var/lib/dpkg/status
 4.4.0.116.122 500
500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
 4.4.0.21.22 500
500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
root@ubuntu:~# ls -al /dev/bcache/*
/dev/bcache/by-label:
total 0
drwxr-xr-x 2 root root 120 Mar 19 19:07 .
drwxr-xr-x 4 root root  80 Mar 19 19:07 ..
lrwxrwxrwx 1 root root  13 Mar 19 19:07 backing-sdb -> ../../bcache0
lrwxrwxrwx 1 root root  13 Mar 19 19:07 backing-sdd -> ../../bcache3
lrwxrwxrwx 1 root root  13 Mar 19 19:07 backing-sde -> ../../bcache2
lrwxrwxrwx 1 root root  13 Mar 19 19:07 backing-sdf -> ../../bcache1

/dev/bcache/by-uuid:
total 0
drwxr-xr-x 2 root root 120 Mar 19 19:07 .
drwxr-xr-x 4 root root  80 Mar 19 19:07 ..
lrwxrwxrwx 1 root root  13 Mar 19 19:07 1f531b44-437f-49cc-b7db-16db6d699c41 -> 
../../bcache1
lrwxrwxrwx 1 root root  13 Mar 19 19:07 31474eb7-687d-4bb7-8c6b-b4efd472e860 -> 
../../bcache0
lrwxrwxrwx 1 root root  13 Mar 19 19:07 3653ce1f-b6aa-43ad-9a91-506530db2d50 -> 
../../bcache3
lrwxrwxrwx 1 root root  13 Mar 19 19:07 94041d44-4bb2-4e4d-8641-21d4ae410595 -> 
../../bcache2
root@ubuntu:~# ls -al /dev/bcache/by-label/backing-sdb 
lrwxrwxrwx 1 root root 13 Mar 19 19:07 /dev/bcache/by-label/backing-sdb -> 
../../bcache0
root@ubuntu:~# ls -al /sys/class/block/bcache0/slaves
total 0
drwxr-xr-x 2 root root 0 Mar 19 19:08 .
drwxr-xr-x 8 root root 0 Mar 19 19:07 ..
lrwxrwxrwx 1 root root 0 Mar 19 19:08 sda -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:0/2:0:0:0/block/sda
lrwxrwxrwx 1 root root 0 Mar 19 19:08 sdb -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:1/2:0:1:0/block/sdb
root@ubuntu:~# ls -al /dev/bcache/by-label/backing-sdd
lrwxrwxrwx 1 root root 13 Mar 19 19:07 /dev/bcache/by-label/backing-sdd -> 
../../bcache3
root@ubuntu:~# ls -al /sys/class/block/bcache3/slaves
total 0
drwxr-xr-x 2 root root 0 Mar 19 19:09 .
drwxr-xr-x 8 root root 0 Mar 19 19:07 ..
lrwxrwxrwx 1 root root 0 Mar 19 19:09 sda -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:0/2:0:0:0/block/sda
lrwxrwxrwx 1 root root 0 Mar 19 19:09 sdd -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:3/2:0:3:0/block/sdd
root@ubuntu:~# ls -al /dev/bcache/by-label/backing-sde
lrwxrwxrwx 1 root root 13 Mar 19 19:07 /dev/bcache/by-label/backing-sde -> 
../../bcache2
root@ubuntu:~# ls -al /sys/class/block/bcache2/slaves
total 0
drwxr-xr-x 2 root root 0 Mar 19 19:09 .
drwxr-xr-x 8 root root 0 Mar 19 19:07 ..
lrwxrwxrwx 1 root root 0 Mar 19 19:09 sdc -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:2/2:0:2:0/block/sdc
lrwxrwxrwx 1 root root 0 Mar 19 19:09 sde -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:4/2:0:4:0/block/sde
root@ubuntu:~# ls -al /dev/bcache/by-label/backing-sdf
lrwxrwxrwx 1 root root 13 Mar 19 19:07 /dev/bcache/by-label/backing-sdf -> 
../../bcache1
root@ubuntu:~# ls -al /sys/class/block/bcache1/slaves
total 0
drwxr-xr-x 2 root root 0 Mar 19 19:09 .
drwxr-xr-x 8 root root 0 Mar 19 19:07 ..
lrwxrwxrwx 1 root root 0 Mar 19 19:09 sdc -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:2/2:0:2:0/block/sdc
lrwxrwxrwx 1 root root 0 Mar 19 19:09 sdf -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:5/2:0:5:0/block/sdf
root@ubuntu:~# dmesg | grep bcache
[1.271827] bcache: register_bdev() registered backing device sdb
[1.276685] bcache: register_bdev() registered backing device sdf
[1.286218] bcache: bch_journal_replay() journal replay done, 0 keys in 2 
entries, seq 13
[1.309504] bcache: bch_cached_dev_attach() Caching sdb as bcache0 on set 
0dbdcc17-7af0-4318-bd57-bbdf5c7f1bfa
[1.313789] bcache: register_cache() registered cache device sda
[1.365415] bcache: bch_journal_replay() journal replay done, 0 keys in 2 
entries, seq 13
[1.380090] bcache: bch_cached_dev_attach() Caching sdf as bcache1 on set 
d36b419d-a49d-42e2-95af-710138a20700
[1.382049] bcache: register_cache() registered cache device sdc
[1.383332] bcache: register_bdev() registered backing device sde
[1.391625] bcache: bch_cached_dev_attach() Caching sde as bcache2 on set 
d36b419d-a49d-42e2-95af-710138a20700
[1.395701] bcache: register_bdev() registered backing device sdd
[1.405870] bcache: bch_cached_dev_attach() Caching sdd as bcache3 on set 
0dbdcc17-7af0-4318-bd57-bbdf5c7f1bfa
[4.533291] bcache: 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Artful verified:

ubuntu@ubuntu:~$ lsb_release -rd
Description:Ubuntu 17.10
Release:17.10
ubuntu@ubuntu:~$ uname -a
Linux ubuntu 4.13.0-38-generic #43-Ubuntu SMP Wed Mar 14 15:20:44 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux
ubuntu@ubuntu:~$ apt-cache policy linux-image-virtual
linux-image-virtual:
  Installed: 4.13.0.38.41
  Candidate: 4.13.0.38.41
  Version table:
 *** 4.13.0.38.41 500
500 http://archive.ubuntu.com/ubuntu artful-proposed/main amd64 Packages
100 /var/lib/dpkg/status
 4.13.0.37.40 500
500 http://archive.ubuntu.com/ubuntu artful-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu artful-security/main amd64 
Packages
 4.13.0.16.17 500
500 http://archive.ubuntu.com/ubuntu artful/main amd64 Packages

ubuntu@ubuntu:~$ ls -al /dev/bcache/by-*
/dev/bcache/by-label:
total 0
drwxr-xr-x 2 root root 120 Mar 19 18:32 .
drwxr-xr-x 4 root root  80 Mar 19 18:32 ..
lrwxrwxrwx 1 root root  13 Mar 19 18:32 backing-sdb -> ../../bcache1
lrwxrwxrwx 1 root root  13 Mar 19 18:32 backing-sdd -> ../../bcache0
lrwxrwxrwx 1 root root  13 Mar 19 18:32 backing-sde -> ../../bcache3
lrwxrwxrwx 1 root root  13 Mar 19 18:32 backing-sdf -> ../../bcache2

/dev/bcache/by-uuid:
total 0
drwxr-xr-x 2 root root 120 Mar 19 18:32 .
drwxr-xr-x 4 root root  80 Mar 19 18:32 ..
lrwxrwxrwx 1 root root  13 Mar 19 18:32 1f531b44-437f-49cc-b7db-16db6d699c41 -> 
../../bcache2
lrwxrwxrwx 1 root root  13 Mar 19 18:32 31474eb7-687d-4bb7-8c6b-b4efd472e860 -> 
../../bcache1
lrwxrwxrwx 1 root root  13 Mar 19 18:32 3653ce1f-b6aa-43ad-9a91-506530db2d50 -> 
../../bcache0
lrwxrwxrwx 1 root root  13 Mar 19 18:32 94041d44-4bb2-4e4d-8641-21d4ae410595 -> 
../../bcache3


ubuntu@ubuntu:~$ ls -al /dev/bcache/by-label/
total 0
drwxr-xr-x 2 root root 120 Mar 19 18:32 .
drwxr-xr-x 4 root root  80 Mar 19 18:32 ..
lrwxrwxrwx 1 root root  13 Mar 19 18:32 backing-sdb -> ../../bcache1
lrwxrwxrwx 1 root root  13 Mar 19 18:32 backing-sdd -> ../../bcache0
lrwxrwxrwx 1 root root  13 Mar 19 18:32 backing-sde -> ../../bcache3
lrwxrwxrwx 1 root root  13 Mar 19 18:32 backing-sdf -> ../../bcache2

ubuntu@ubuntu:~$ ls -al /dev/bcache/by-label/backing-sdb 
lrwxrwxrwx 1 root root 13 Mar 19 18:32 /dev/bcache/by-label/backing-sdb -> 
../../bcache1
ubuntu@ubuntu:~$ ls -al /sys/class/block/bcache1/slaves/
total 0
drwxr-xr-x 2 root root 0 Mar 19 18:36 .
drwxr-xr-x 8 root root 0 Mar 19 18:36 ..
lrwxrwxrwx 1 root root 0 Mar 19 18:36 sda -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:0/2:0:0:0/block/sda
lrwxrwxrwx 1 root root 0 Mar 19 18:36 sdb -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:1/2:0:1:0/block/sdb
ubuntu@ubuntu:~$ ls -al /dev/bcache/by-label/backing-sdd
lrwxrwxrwx 1 root root 13 Mar 19 18:32 /dev/bcache/by-label/backing-sdd -> 
../../bcache0
ubuntu@ubuntu:~$ ls -al /sys/class/block/bcache0/slaves/
total 0
drwxr-xr-x 2 root root 0 Mar 19 18:36 .
drwxr-xr-x 8 root root 0 Mar 19 18:36 ..
lrwxrwxrwx 1 root root 0 Mar 19 18:36 sda -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:0/2:0:0:0/block/sda
lrwxrwxrwx 1 root root 0 Mar 19 18:36 sdd -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:3/2:0:3:0/block/sdd
ubuntu@ubuntu:~$ ls -al /dev/bcache/by-label/backing-sde
lrwxrwxrwx 1 root root 13 Mar 19 18:32 /dev/bcache/by-label/backing-sde -> 
../../bcache3
ubuntu@ubuntu:~$ ls -al /sys/class/block/bcache3/slaves/
total 0
drwxr-xr-x 2 root root 0 Mar 19 18:36 .
drwxr-xr-x 8 root root 0 Mar 19 18:36 ..
lrwxrwxrwx 1 root root 0 Mar 19 18:36 sdc -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:2/2:0:2:0/block/sdc
lrwxrwxrwx 1 root root 0 Mar 19 18:36 sde -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:4/2:0:4:0/block/sde
ubuntu@ubuntu:~$ ls -al /dev/bcache/by-label/backing-sdf
lrwxrwxrwx 1 root root 13 Mar 19 18:32 /dev/bcache/by-label/backing-sdf -> 
../../bcache2
ubuntu@ubuntu:~$ ls -al /sys/class/block/bcache2/slaves/
total 0
drwxr-xr-x 2 root root 0 Mar 19 18:37 .
drwxr-xr-x 8 root root 0 Mar 19 18:32 ..
lrwxrwxrwx 1 root root 0 Mar 19 18:37 sdc -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:2/2:0:2:0/block/sdc
lrwxrwxrwx 1 root root 0 Mar 19 18:37 sdf -> 
../../../../pci:00/:00:04.0/virtio1/host2/target2:0:5/2:0:5:0/block/sdf

$ dmesg | grep bcache
[1.210989] bcache: register_bdev() registered backing device sdd
[1.214956] bcache: bch_journal_replay() journal replay done, 0 keys in 2 
entries, seq 9
[1.216142] bcache: register_cache() registered cache device sdc
[1.216436] bcache: register_bdev() registered backing device sdb
[1.220348] bcache: bch_journal_replay() journal replay done, 0 keys in 2 
entries, seq 9
[1.233925] bcache: bch_cached_dev_attach() Caching sdb as bcache1 on set 
0dbdcc17-7af0-4318-bd57-bbdf5c7f1bfa
[1.270172] bcache: bch_cached_dev_attach() Caching sdd as bcache0 on set 
0dbdcc17-7af0-4318-bd57-bbdf5c7f1bfa
[1.272236] bcache: 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Not sure if this was supposed to also be fixed in bionic-proposed yet,
but I assumed so and
it's not working there;  I'll test -proposed in artful and xenial next.

ubuntu@ubuntu:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu Bionic Beaver (development branch)"
ubuntu@ubuntu:~$ uname -a
Linux ubuntu 4.15.0-13-generic #14-Ubuntu SMP Sat Mar 17 13:44:27 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux

ubuntu@ubuntu:~$ apt-cache policy linux-image-virtual
linux-image-virtual:
  Installed: 4.15.0.13.14
  Candidate: 4.15.0.13.14
  Version table:
 *** 4.15.0.13.14 500
500 http://archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages
100 /var/lib/dpkg/status
 4.15.0.12.13 500
500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
ubuntu@ubuntu:~$ uname -a
Linux ubuntu 4.15.0-13-generic #14-Ubuntu SMP Sat Mar 17 13:44:27 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux

ubuntu@ubuntu:~$ ls -al /dev/bcache*
brw-rw 1 root disk 251,   0 Mar 19 18:09 /dev/bcache0
brw-rw 1 root disk 251, 128 Mar 19 18:09 /dev/bcache1
brw-rw 1 root disk 251, 256 Mar 19 18:09 /dev/bcache2
brw-rw 1 root disk 251, 384 Mar 19 18:09 /dev/bcache3
ubuntu@ubuntu:~$ dmesg | grep bcache
[1.005037] bcache: register_bdev() registered backing device sdb
[1.011078] bcache: bch_journal_replay() journal replay done, 0
keys in 1 entries, seq 5
[1.023834] bcache: bch_cached_dev_attach() Caching sdb as bcache0
on set 0dbdcc17-7af0-4318-bd57-bbdf5c7f1bfa
[1.029237] bcache: register_cache() registered cache device sda
[1.029555] bcache: register_bdev() registered backing device sdd
[1.050543] bcache: bch_cached_dev_attach() Caching sdd as bcache1
on set 0dbdcc17-7af0-4318-bd57-bbdf5c7f1bfa
[1.052124] bcache: register_bdev() registered backing device sde
[1.054044] bcache: register_bdev() registered backing device sdf
[1.058398] bcache: bch_journal_replay() journal replay done, 0
keys in 1 entries, seq 5
[1.068618] bcache: bch_cached_dev_attach() Caching sdf as bcache3
on set d36b419d-a49d-42e2-95af-710138a20700
[1.070652] bcache: bch_cached_dev_attach() Caching sde as bcache2
on set d36b419d-a49d-42e2-95af-710138a20700
[1.076326] bcache: register_cache() registered cache device sdc
[4.090280] bcache: register_bcache() error /dev/sdc: device
already registered
[4.091070] bcache: register_bcache() error /dev/sdd: device
already registered
[4.094397] bcache: register_bcache() error /dev/sde: device
already registered
[4.095253] bcache: register_bcache() error /dev/sda: device
already registered
[4.103178] bcache: register_bcache() error /dev/sdb: device
already registered
[4.115378] bcache: register_bcache() error /dev/sdf: device
already registered

On Mon, Mar 19, 2018 at 5:56 AM, Stefan Bader
 wrote:
> This bug is awaiting verification that the kernel in -proposed solves
> the problem. Please test the kernel and update this bug with the
> results. If the problem is solved, change the tag 'verification-needed-
> artful' to 'verification-done-artful'. If the problem still exists,
> change the tag 'verification-needed-artful' to 'verification-failed-
> artful'.
>
> If verification is not done by 5 working days from today, this fix will
> be dropped from the source code, and this bug will be closed.
>
> See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
> to enable and use -proposed. Thank you!
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145/+subscriptions

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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  In Progress

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Stefan Bader]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag 'verification-needed-xenial' to 'verification-failed-
xenial'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-xenial

** Tags added: verification-needed-artful

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  In Progress

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Stefan Bader]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
artful' to 'verification-done-artful'. If the problem still exists,
change the tag 'verification-needed-artful' to 'verification-failed-
artful'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  In Progress

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Scott Moser]

Joseph forwarded this upstream.  LKML mailing list post
https://lkml.org/lkml/2018/3/1/812 .

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  In Progress

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-16-generic N/A
   linux-backports-modules-4.13.0-16-generic  N/A
   

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

On Fri, Feb 16, 2018 at 12:14 PM, Joseph Salisbury <
joseph.salisb...@canonical.com> wrote:

> @raharper,  I got side tracked and it got pushed down on my list.  I can
> still send it upstream if you want.  It's currently in Ubuntu as a SAUCE
> patch.
>

That would be great!
Thanks,


>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  In Progress

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

@raharper,  I got side tracked and it got pushed down on my list.  I can
still send it upstream if you want.  It's currently in Ubuntu as a SAUCE
patch.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  In Progress

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

@jsalisbury Did you get a chance to forward the patch upstream?  We've a
userspace fix in the bcache-tools package for now; I've sent that
upstream here:

https://github.com/koverstreet/bcache-tools/pull/1

Kent was asking about the kernel fix, to which I pointed to the patch
here.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  In Progress

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
    Installed: 4.13.0-16.19
    Candidate: 4.13.0-16.19
    Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  It appears that since the initramfs loads the bcache module which
  probes and finds all of the cache devices and backing devices then
  once the rootfs is mounted and udev gets to run, the bcache kernel
  module does not emit the CACHED_UUID value into the environment if the
  underlying devices are already registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
    register_bdev()
  bch_cached_dev_run()
    kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes:
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Scott Moser]

** Description changed:

  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10
  
  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
-   Installed: 4.13.0-16.19
-   Candidate: 4.13.0-16.19
-   Version table:
-  *** 4.13.0-16.19 500
- 500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
- 100 /var/lib/dpkg/status
+   Installed: 4.13.0-16.19
+   Candidate: 4.13.0-16.19
+   Version table:
+  *** 4.13.0-16.19 500
+ 500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
+ 100 /var/lib/dpkg/status
  
  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.
  
  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath
  
- 
- It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.
+ It appears that since the initramfs loads the bcache module which probes
+ and finds all of the cache devices and backing devices then once the
+ rootfs is mounted and udev gets to run, the bcache kernel module does
+ not emit the CACHED_UUID value into the environment if the underlying
+ devices are already registered.
  
  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:
  
  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1
  
  then rootfs ismounted and systemd starts systemd-udev
  
  [9.350889] systemd[1]: Listening on udev Kernel Socket.
  
  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails
  
  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered
  
  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:
  
  bcache_register()
-   register_bdev()
- bch_cached_dev_run()
-   kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);
-   
- where env includes: 
- "DRIVER=bcache",
- kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
- NULL,
- NULL,
- };
+   register_bdev()
+ bch_cached_dev_run()
+   kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);
+ 
+ where env includes:
+ "DRIVER=bcache",
+ kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
+ NULL,
+ NULL,
+ };
  
  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
-  total 0
-  crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
-  crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
+  total 0
+  crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
+  crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
-  Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
-  Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Khaled El Mously]

** Changed in: linux (Ubuntu Xenial)
   Status: In Progress => Fix Committed

** Changed in: linux (Ubuntu Artful)
   Status: In Progress => Fix Committed

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in systemd package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  Fix Committed
Status in systemd source package in Xenial:
  Won't Fix
Status in linux source package in Zesty:
  Won't Fix
Status in systemd source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Committed
Status in systemd source package in Artful:
  Won't Fix
Status in linux source package in Bionic:
  In Progress
Status in systemd source package in Bionic:
  Won't Fix

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~raharper/curtin/+git/curtin/+merge/336871

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in systemd package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  In Progress
Status in systemd source package in Xenial:
  Won't Fix
Status in linux source package in Zesty:
  Won't Fix
Status in systemd source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  In Progress
Status in systemd source package in Artful:
  Won't Fix
Status in linux source package in Bionic:
  In Progress
Status in systemd source package in Bionic:
  Won't Fix

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Stefan Bader]

** Changed in: linux (Ubuntu Zesty)
   Status: In Progress => Won't Fix

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in systemd package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  In Progress
Status in systemd source package in Xenial:
  Won't Fix
Status in linux source package in Zesty:
  Won't Fix
Status in systemd source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  In Progress
Status in systemd source package in Artful:
  Won't Fix
Status in linux source package in Bionic:
  In Progress
Status in systemd source package in Bionic:
  Won't Fix

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Steve Langasek]

** Changed in: systemd (Ubuntu Xenial)
   Status: New => Won't Fix

** Changed in: systemd (Ubuntu Zesty)
   Status: New => Won't Fix

** Changed in: systemd (Ubuntu Artful)
   Status: New => Won't Fix

** Changed in: systemd (Ubuntu Bionic)
   Status: Incomplete => Won't Fix

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in systemd package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  In Progress
Status in systemd source package in Xenial:
  Won't Fix
Status in linux source package in Zesty:
  In Progress
Status in systemd source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  In Progress
Status in systemd source package in Artful:
  Won't Fix
Status in linux source package in Bionic:
  In Progress
Status in systemd source package in Bionic:
  Won't Fix

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

On Tue, Dec 12, 2017 at 5:52 AM, Dimitri John Ledkov  wrote:

> Once the kernel is fixed, are there any changes that are required to
> systemd/udev?
>

No changes needed.


>
> ** Changed in: systemd (Ubuntu Bionic)
>Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in systemd package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  In Progress
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  In Progress
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  In Progress
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  In Progress
Status in systemd source package in Bionic:
  Incomplete

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dimitri John Ledkov]

Once the kernel is fixed, are there any changes that are required to
systemd/udev?

** Changed in: systemd (Ubuntu Bionic)
   Status: New => Incomplete

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in systemd package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  In Progress
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  In Progress
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  In Progress
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  In Progress
Status in systemd source package in Bionic:
  Incomplete

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

** Changed in: linux (Ubuntu Xenial)
   Status: Triaged => In Progress

** Changed in: linux (Ubuntu Xenial)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Zesty)
   Status: Triaged => In Progress

** Changed in: linux (Ubuntu Zesty)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Artful)
   Status: Triaged => In Progress

** Changed in: linux (Ubuntu Artful)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Bionic)
   Status: Triaged => In Progress

** Changed in: linux (Ubuntu Bionic)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Tags removed: kernel-key

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  In Progress
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  In Progress
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  In Progress
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  In Progress
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  In Progress
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Confirmed bionic works as expected.

I suspect you can send that upstream with my SoB faster than I can.
Definitely interested in seeing if they'll take something like that.

On Thu, Dec 7, 2017 at 1:21 PM, Joseph Salisbury <
joseph.salisb...@canonical.com> wrote:

> Thanks for testing and the patch, Ryan.  I can submit and SRU request.
>
> We should also send this upstream for inclusion in the mainline kernel.
> Is that something you think you can do?  If not, I can do it for you.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

Submitted SRU requests:
https://lists.ubuntu.com/archives/kernel-team/2017-December/088680.html
https://lists.ubuntu.com/archives/kernel-team/2017-December/088682.html

-- 
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

Thanks for testing and the patch, Ryan.  I can submit and SRU request.

We should also send this upstream for inclusion in the mainline kernel.
Is that something you think you can do?  If not, I can do it for you.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Tested the xenial update.  I had one boot where the links didn't get
created, but I cannot recreate that issue now.

On Thu, Dec 7, 2017 at 9:56 AM, Ryan Harper 
wrote:

> Here's the Zesty test; all looks good.
>
> ubuntu@ubuntu:~$ cat /etc/cloud/build.info
> build_name: server
> serial: 20171207
> ubuntu@ubuntu:~$ uname -a
> Linux ubuntu 4.10.0-40-generic #44~lp1729145 SMP Wed Dec 6 16:21:45 UTC
> 2017 x86_64 x86_64 x86_64 GNU/Linux
> ubuntu@ubuntu:~$ tree /dev/bcache
> /dev/bcache [error opening dir]
>
> 0 directories, 0 files
>
> $ sudo dpkg --install linux-image-4.10.0-40-generic_
> 4.10.0-40.44~lp1729145_amd64.deb
> dpkg: warning: downgrading linux-image-4.10.0-40-generic from 4.10.0-40.44
> to 4.10.0-40.44~lp1729145
> (Reading database ... 56846 files and directories currently installed.)
> Preparing to unpack linux-image-4.10.0-40-generic_
> 4.10.0-40.44~lp1729145_amd64.deb ...
> Done.
> Unpacking linux-image-4.10.0-40-generic (4.10.0-40.44~lp1729145) over
> (4.10.0-40.44) ...
> Examining /etc/kernel/postrm.d .
> run-parts: executing /etc/kernel/postrm.d/initramfs-tools
> 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
> run-parts: executing /etc/kernel/postrm.d/x-grub-legacy-ec2
> 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
> run-parts: executing /etc/kernel/postrm.d/zz-update-grub
> 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
> Setting up linux-image-4.10.0-40-generic (4.10.0-40.44~lp1729145) ...
> Running depmod.
> update-initramfs: deferring update (hook will be called later)
> Not updating initrd symbolic links since we are being updated/reinstalled
> (4.10.0-40.44 was configured last, according to dpkg)
> Not updating image symbolic links since we are being updated/reinstalled
> (4.10.0-40.44 was configured last, according to dpkg)
> Examining /etc/kernel/postinst.d.
> run-parts: executing /etc/kernel/postinst.d/apt-auto-removal
> 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
> run-parts: executing /etc/kernel/postinst.d/initramfs-tools
> 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
> update-initramfs: Generating /boot/initrd.img-4.10.0-40-generic
> W: mdadm: /etc/mdadm/mdadm.conf defines no arrays.
> run-parts: executing /etc/kernel/postinst.d/unattended-upgrades
> 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
> run-parts: executing /etc/kernel/postinst.d/update-notifier
> 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
> run-parts: executing /etc/kernel/postinst.d/x-grub-legacy-ec2
> 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
> Searching for GRUB installation directory ... found: /boot/grub
> Searching for default file ... found: /boot/grub/default
> Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
> Searching for splash image ... none found, skipping ...
> Found kernel: /boot/vmlinuz-4.10.0-40-generic
> Found kernel: /boot/vmlinuz-4.10.0-40-generic
> Updating /boot/grub/menu.lst ... done
>
> run-parts: executing /etc/kernel/postinst.d/zz-update-grub
> 4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
> Generating grub configuration file ...
> Found linux image: /boot/vmlinuz-4.10.0-40-generic
> Found initrd image: /boot/initrd.img-4.10.0-40-generic
> done
> ubuntu@ubuntu:~$ sudo reboot
> ...
>
> ubuntu@ubuntu:~$ dpkg --list | grep linux-image
> ii  linux-image-4.10.0-40-generic  4.10.0-40.44~lp1729145
>  amd64Linux kernel image for version 4.10.0 on 64
> bit x86 SMP
> ii  linux-image-virtual4.10.0.40.40
>  amd64Virtual Linux kernel image
> ubuntu@ubuntu:~$ sudo tree /dev/bcache
> /dev/bcache
> ├── by-label
> │   ├── backing0 -> ../../bcache2
> │   └── backing1 -> ../../bcache0
> └── by-uuid
> ├── 1375d23f-4780-46d7-9fca-c397f8333685 -> ../../bcache3
> ├── 57e009b1-6bf4-42ea-abe0-334b10941a0b -> ../../bcache0
> ├── 7ce7dc32-7da9-42a8-899a-5d21ed7ea714 -> ../../bcache1
> └── 92d882d8-38cd-4537-847b-6f9c40ba67b4 -> ../../bcache2
>
> 2 directories, 6 files
>
>
> On Wed, Dec 6, 2017 at 11:00 AM, Joseph Salisbury <
> joseph.salisb...@canonical.com> wrote:
>
>> I built Xenial, Zesty and Bionic test kernels with your patch.  They can
>> also be downloaded from:
>>
>> http://kernel.ubuntu.com/~jsalisbury/lp1729145/
>>
>> Can those that can reproduce this bug give this test kernel a try?
>>
>>
>> Zesty required upstream commit 4b758df21 as a prereq.  Zesty never got
>> it, since upstream 4.10 is EOL.  Zesty would be the more important test
>> kernel to try due to this difference.
>>
>> Thanks again.
>>
>> --
>> You received this bug notification because you are subscribed to the bug
>> report.
>> https://bugs.launchpad.net/bugs/1729145
>>
>> Title:
>>   /dev/bcache/by-uuid links not created after reboot
>>
>> To manage notifications about this bug go to:
>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145
>> /+subscriptions
>>
>
>

-- 
You received this bug notification because you are a member of 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Here's the Zesty test; all looks good.

ubuntu@ubuntu:~$ cat /etc/cloud/build.info
build_name: server
serial: 20171207
ubuntu@ubuntu:~$ uname -a
Linux ubuntu 4.10.0-40-generic #44~lp1729145 SMP Wed Dec 6 16:21:45 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux
ubuntu@ubuntu:~$ tree /dev/bcache
/dev/bcache [error opening dir]

0 directories, 0 files

$ sudo dpkg --install
linux-image-4.10.0-40-generic_4.10.0-40.44~lp1729145_amd64.deb
dpkg: warning: downgrading linux-image-4.10.0-40-generic from 4.10.0-40.44
to 4.10.0-40.44~lp1729145
(Reading database ... 56846 files and directories currently installed.)
Preparing to unpack
linux-image-4.10.0-40-generic_4.10.0-40.44~lp1729145_amd64.deb ...
Done.
Unpacking linux-image-4.10.0-40-generic (4.10.0-40.44~lp1729145) over
(4.10.0-40.44) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.10.0-40-generic
/boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postrm.d/x-grub-legacy-ec2
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.10.0-40-generic
/boot/vmlinuz-4.10.0-40-generic
Setting up linux-image-4.10.0-40-generic (4.10.0-40.44~lp1729145) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Not updating initrd symbolic links since we are being updated/reinstalled
(4.10.0-40.44 was configured last, according to dpkg)
Not updating image symbolic links since we are being updated/reinstalled
(4.10.0-40.44 was configured last, according to dpkg)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
update-initramfs: Generating /boot/initrd.img-4.10.0-40-generic
W: mdadm: /etc/mdadm/mdadm.conf defines no arrays.
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postinst.d/x-grub-legacy-ec2
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-4.10.0-40-generic
Found kernel: /boot/vmlinuz-4.10.0-40-generic
Updating /boot/grub/menu.lst ... done

run-parts: executing /etc/kernel/postinst.d/zz-update-grub
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.10.0-40-generic
Found initrd image: /boot/initrd.img-4.10.0-40-generic
done
ubuntu@ubuntu:~$ sudo reboot
...

ubuntu@ubuntu:~$ dpkg --list | grep linux-image
ii  linux-image-4.10.0-40-generic  4.10.0-40.44~lp1729145
 amd64Linux kernel image for version 4.10.0 on 64
bit x86 SMP
ii  linux-image-virtual4.10.0.40.40
 amd64Virtual Linux kernel image
ubuntu@ubuntu:~$ sudo tree /dev/bcache
/dev/bcache
├── by-label
│   ├── backing0 -> ../../bcache2
│   └── backing1 -> ../../bcache0
└── by-uuid
├── 1375d23f-4780-46d7-9fca-c397f8333685 -> ../../bcache3
├── 57e009b1-6bf4-42ea-abe0-334b10941a0b -> ../../bcache0
├── 7ce7dc32-7da9-42a8-899a-5d21ed7ea714 -> ../../bcache1
└── 92d882d8-38cd-4537-847b-6f9c40ba67b4 -> ../../bcache2

2 directories, 6 files


On Wed, Dec 6, 2017 at 11:00 AM, Joseph Salisbury <
joseph.salisb...@canonical.com> wrote:

> I built Xenial, Zesty and Bionic test kernels with your patch.  They can
> also be downloaded from:
>
> http://kernel.ubuntu.com/~jsalisbury/lp1729145/
>
> Can those that can reproduce this bug give this test kernel a try?
>
>
> Zesty required upstream commit 4b758df21 as a prereq.  Zesty never got it,
> since upstream 4.10 is EOL.  Zesty would be the more important test kernel
> to try due to this difference.
>
> Thanks again.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

I built Xenial, Zesty and Bionic test kernels with your patch.  They can
also be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1729145/

Can those that can reproduce this bug give this test kernel a try?


Zesty required upstream commit 4b758df21 as a prereq.  Zesty never got it, 
since upstream 4.10 is EOL.  Zesty would be the more important test kernel to 
try due to this difference.

Thanks again.

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Thanks for doing the cleanup;  Patch looks good and I approve.

Signed-off-by: Ryan Harper 

On Tue, Dec 5, 2017 at 4:59 PM, Joseph Salisbury <
joseph.salisb...@canonical.com> wrote:

> In the final patch we submit for SRU, it will also include your Signed-
> off-by, I just forgot to add it in the attached one.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

In the final patch we submit for SRU, it will also include your Signed-
off-by, I just forgot to add it in the attached one.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

I attached an update to your patch, Ryan.

I added a subject, commit log and couple of missing semi colons /
parenthesis.

Can you look it over and see if you approve of the log and subject?
I'll see if it applies to the other Ubuntu releases and builds on them
as well.

** Patch added: "0001-bcache-decouple-emitting-a-cached_dev-CHANGE-uevent.patch"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145/+attachment/5018981/+files/0001-bcache-decouple-emitting-a-cached_dev-CHANGE-uevent.patch

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Woot!

I think that did the trick.

ubuntu@ubuntu:~$ cat /etc/cloud/build.info
build_name: server
serial: 20171122
ubuntu@ubuntu:~$ lsb_release -rd
Description: Ubuntu 17.10
Release: 17.10
ubuntu@ubuntu:~$ set -o vi
ubuntu@ubuntu:~$ dpkg --list | grep linux-image
ii  linux-image-4.13.0-17-generic  4.13.0-17.20~lp1739145
 amd64Linux kernel image for version 4.13.0 on 64
bit x86 SMP
ii  linux-image-virtual4.13.0.17.18
 amd64Virtual Linux kernel image
ubuntu@ubuntu:~$ dpkg --list | grep bcache-tools
ii  bcache-tools   1.0.8-2build1
amd64bcache userspace tools

ubuntu@ubuntu:~$ sudo tree /dev/bcache
/dev/bcache
├── by-label
│   ├── backing0 -> ../../bcache1
│   └── backing1 -> ../../bcache0
└── by-uuid
├── 1375d23f-4780-46d7-9fca-c397f8333685 -> ../../bcache2
├── 57e009b1-6bf4-42ea-abe0-334b10941a0b -> ../../bcache0
├── 7ce7dc32-7da9-42a8-899a-5d21ed7ea714 -> ../../bcache3
└── 92d882d8-38cd-4537-847b-6f9c40ba67b4 -> ../../bcache1

2 directories, 6 files


On Tue, Dec 5, 2017 at 4:00 PM, Ryan Harper 
wrote:

> Thanks!  I'll give it a try today.
>
> On Tue, Dec 5, 2017 at 3:43 PM, Joseph Salisbury <
> joseph.salisb...@canonical.com> wrote:
>
>> I built an Artful test kernel with the path provided by Ryan.  The test
>> kernel can be downloaded from:
>>
>> http://kernel.ubuntu.com/~jsalisbury/lp1729145/
>>
>> Can those that can reproduce this bug give this test kernel a try?
>>
>> --
>> You received this bug notification because you are subscribed to the bug
>> report.
>> https://bugs.launchpad.net/bugs/1729145
>>
>> Title:
>>   /dev/bcache/by-uuid links not created after reboot
>>
>> To manage notifications about this bug go to:
>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145
>> /+subscriptions
>>
>
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Thanks!  I'll give it a try today.

On Tue, Dec 5, 2017 at 3:43 PM, Joseph Salisbury <
joseph.salisb...@canonical.com> wrote:

> I built an Artful test kernel with the path provided by Ryan.  The test
> kernel can be downloaded from:
>
> http://kernel.ubuntu.com/~jsalisbury/lp1729145/
>
> Can those that can reproduce this bug give this test kernel a try?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

I built an Artful test kernel with the path provided by Ryan.  The test
kernel can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1729145/

Can those that can reproduce this bug give this test kernel a try?

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Revised patch, should fix error with kfree on env

** Patch added: "bcache_always_emit_backing_dev_change_uevent_v2.diff"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145/+attachment/5018329/+files/bcache_always_emit_backing_dev_change_uevent_v2.diff

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Looks like those two kfree's in dev_run can be dropped since that was an
exit after kmalloc'ing env entries which are now only done in

bch_cached_dev_emit_change()

which is only called by dev_run after it knows that the device is not
yet running.


On Mon, Dec 4, 2017 at 11:35 AM, Ryan Harper 
wrote:

> Hi Joseph,
>
> Sorry, I didn't give that a compile either; I just wanted to show what the
> change could look like;
> Let me see if I can get that to at least compile.
>
>
> On Mon, Dec 4, 2017 at 11:18 AM, Joseph Salisbury <
> joseph.salisb...@canonical.com> wrote:
>
>> It looks like env[] was declared in bch_cached_dev_emit_change(), but
>> not in bch_cached_dev_run().
>>
>> --
>> You received this bug notification because you are subscribed to the bug
>> report.
>> https://bugs.launchpad.net/bugs/1729145
>>
>> Title:
>>   /dev/bcache/by-uuid links not created after reboot
>>
>> To manage notifications about this bug go to:
>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145
>> /+subscriptions
>>
>
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Hi Joseph,

Sorry, I didn't give that a compile either; I just wanted to show what the
change could look like;
Let me see if I can get that to at least compile.


On Mon, Dec 4, 2017 at 11:18 AM, Joseph Salisbury <
joseph.salisb...@canonical.com> wrote:

> It looks like env[] was declared in bch_cached_dev_emit_change(), but
> not in bch_cached_dev_run().
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

It looks like env[] was declared in bch_cached_dev_emit_change(), but
not in bch_cached_dev_run().

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

@Ryan

I tried to build an Artful test kernel with your patch.  However, there
were compilation errors:

ubuntu-artful/drivers/md/bcache/super.c:868:9: error: 'env' undeclared (first 
use in this function); did you mean '_end'?
   kfree(env[1]);
 ^~~
 _end

Did you have any issues compiling?

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

** Tags removed: kernel-da-key
** Tags added: kernel-key

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ubuntu Foundations Team Bug Bot]

The attachment "bcache_always_emit_backing_dev_change_uevent.diff" seems
to be a patch.  If it isn't, please remove the "patch" flag from the
attachment, remove the "patch" tag, and if you are a member of the
~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issues please contact him.]

** Tags added: patch

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Untested patch. Hoping to convey the change that's needed.

- decouple emitting a cached_dev CHANGE uevent which includes dev.uuid and 
dev.label
   from bch_cached_dev_run() which only happens when a bcacheX device is bound 
to the
   actual backing block device (bcache0 -> vdb)
   
- update bch_cached_dev_run() to invoke bch_cached_dev_emit_change() as needed; 
no functional
  code path changes here
  
- Modify register_bcache to detect a re-registering of a bcache cached_dev, and 
in that case
  call bcache_cached_dev_emit_change() to emit the uevent needed to trigger 
SYMLINK generation
  

** Patch added: "bcache_always_emit_backing_dev_change_uevent.diff"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145/+attachment/5017146/+files/bcache_always_emit_backing_dev_change_uevent.diff

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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Dec 01 05:07:25.679368 ubuntu systemd-udevd[474]: LINK
'disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869'
/lib/udev/rules.d/60-persistent-storage.rules:79
Dec 01 05:07:25.683008 ubuntu systemd-udevd[474]: WARK:
dev_old_name=/dev/bcache/by-uuid/92d882d8-38cd-4537-847b-6f9c40ba67b4
dev_old_path=/devices/virtual/block/bcache0
Dec 01 05:07:25.683042 ubuntu systemd-udevd[474]: WARK:
dev_name=/dev/disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869
dev_path=/devices/virtual/block/bcache0
Dec 01 05:07:25.683066 ubuntu systemd-udevd[474]: WARK:
streq(name=/dev/bcache/by-uuid/92d882d8-38cd-4537-847b-6f9c40ba67b4,
name_current=/dev/disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869)
Dec 01 05:07:25.683076 ubuntu systemd-udevd[474]: update old name,
'/dev/bcache/by-uuid/92d882d8-38cd-4537-847b-6f9c40ba67b4' no longer
belonging to '/devices/virtual/block/bcache0'
Dec 01 05:07:25.683085 ubuntu systemd-udevd[474]: WARK:
link_update(name=/dev/bcache/by-uuid/92d882d8-38cd-4537-847b-6f9c40ba67b4,
false
Dec 01 05:07:25.683094 ubuntu systemd-udevd[474]: no reference left, remove
'/dev/bcache/by-uuid/92d882d8-38cd-4537-847b-6f9c40ba67b4'
Dec 01 05:07:25.683104 ubuntu systemd-udevd[474]: WARK:
dev_old_name=/dev/disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869
dev_old_path=/devices/virtual/block/bcache0
Dec 01 05:07:25.683113 ubuntu systemd-udevd[474]: WARK:
dev_name=/dev/disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869
dev_path=/devices/virtual/block/bcache0
Dec 01 05:07:25.683122 ubuntu systemd-udevd[474]: WARK:
streq(name=/dev/disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869,
name_current=/dev/disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869)
Dec 01 05:07:25.683131 ubuntu systemd-udevd[474]: WARK: found match!
continue
Dec 01 05:07:25.683146 ubuntu systemd-udevd[474]: handling device node
'/dev/bcache0', devnum=b250:0, mode=0660, uid=0, gid=6
Dec 01 05:07:25.683155 ubuntu systemd-udevd[474]: set permissions
/dev/bcache0, 060660, uid=0, gid=6
Dec 01 05:07:25.683165 ubuntu systemd-udevd[474]: preserve already existing
symlink '/dev/block/250:0' to '../bcache0'
Dec 01 05:07:25.683174 ubuntu systemd-udevd[474]: found 'b250:0' claiming
'/run/udev/links/\x2fdisk\x2fby-uuid\x2f0a270acb-56b8-4498-8bad-b3bb149fe869'
Dec 01 05:07:25.683183 ubuntu systemd-udevd[474]: creating link
'/dev/disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869' to '/dev/bcache0'
Dec 01 05:07:25.683193 ubuntu systemd-udevd[474]: preserve already existing
symlink '/dev/disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869' to
'../../bcache0'
Dec 01 05:07:25.683201 ubuntu systemd-udevd[474]: created db file
'/run/udev/data/b250:0' for '/devices/virtual/block/bcache0'
Dec 01 05:07:25.683211 ubuntu systemd[1]:
dev-disk-by\x2duuid-0a270acb\x2d56b8\x2d4498\x2d8bad\x2db3bb149fe869.device:
Changed dead -> plugged
Dec 01 05:07:25.683226 ubuntu systemd[1]: dev-bcache0.device: Changed dead
-> plugged
Dec 01 05:07:25.683234 ubuntu systemd[1]:
sys-devices-virtual-block-bcache0.device: Changed dead -> plugged


The new dev (from /deb/bcache0) only has a by-uuid devlink as the UEVENT
that generates the CACHED_UUID devlink is not recorded/discovered
after the original binding of the cache device and backing store.  This
forces udev to remove the link.

I hacked in a change which allows the old link to stay if the old_name, or
old_path match; this
keeps the symlinks around.

This is required (or the kernel fix to emit the CACHED_UUID on cold plug);
but not sufficient.
What else is needed is a change to the bcache rules file such that when a
bcacheN device is
replugged, it will query the backing device's superblock to find out the
dev.uuid, and import that
value as CACHED_UUID so that the dname rule can match the path
/dev/bcache/by-uuid/ and dname
will point to that, which abstracts away whether it points to bcache0, 1 ,
or N.

/dev/disk/by-dname/foo -> ../../../bcache/by-uuid/  ->
../../bcacheN



On Thu, Nov 30, 2017 at 7:16 PM, Ryan Harper 
wrote:

> It looks like there is some ordering issues:
>
> This is a grep through /run/udev/links ; these are checked by udev-dev
>
> # find . -name 'b250*'
> ./\x2fdisk\x2fby-uuid\x2f0a270acb-56b8-4498-8bad-b3bb149fe869/b250:1
> ./\x2fdisk\x2fby-uuid\x2f92b0868d-7e56-4956-8e55-2c90ebee4a72/b250:0
> ./\x2fbcache\x2fby-uuid\x2f92d882d8-38cd-4537-847b-6f9c40ba67b4/b250:1
> ./\x2fbcache\x2fby-uuid\x2f57e009b1-6bf4-42ea-abe0-334b10941a0b/b250:0
>
> So both /dev/bcache/by-uuid and /dev/disk/by-uuid both point to the bcache
> device (b250:0)
>
> udevd shows this:
>
> Nov 30 23:39:10.738290 ubuntu systemd-udevd[465]: LINK
> 'disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869' /lib/udev/rules.d/60-
> persistent-storage.rules:79
> Nov 30 23:39:10.738304 ubuntu systemd-udevd[465]: update old name,
> '/dev/bcache/by-uuid/92d882d8-38cd-4537-847b-6f9c40ba67b4' no longer
> belonging to '/devices/virtual/block/bcache1'
> Nov 30 23:39:10.738321 ubuntu systemd-udevd[465]: no reference left,
> remove 

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

It looks like there is some ordering issues:

This is a grep through /run/udev/links ; these are checked by udev-dev

# find . -name 'b250*'
./\x2fdisk\x2fby-uuid\x2f0a270acb-56b8-4498-8bad-b3bb149fe869/b250:1
./\x2fdisk\x2fby-uuid\x2f92b0868d-7e56-4956-8e55-2c90ebee4a72/b250:0
./\x2fbcache\x2fby-uuid\x2f92d882d8-38cd-4537-847b-6f9c40ba67b4/b250:1
./\x2fbcache\x2fby-uuid\x2f57e009b1-6bf4-42ea-abe0-334b10941a0b/b250:0

So both /dev/bcache/by-uuid and /dev/disk/by-uuid both point to the bcache
device (b250:0)

udevd shows this:

Nov 30 23:39:10.738290 ubuntu systemd-udevd[465]: LINK
'disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869'
/lib/udev/rules.d/60-persistent-storage.rules:79
Nov 30 23:39:10.738304 ubuntu systemd-udevd[465]: update old name,
'/dev/bcache/by-uuid/92d882d8-38cd-4537-847b-6f9c40ba67b4' no longer
belonging to '/devices/virtual/block/bcache1'
Nov 30 23:39:10.738321 ubuntu systemd-udevd[465]: no reference left, remove
'/dev/bcache/by-uuid/92d882d8-38cd-4537-847b-6f9c40ba67b4'
Nov 30 23:39:10.738361 ubuntu systemd-udevd[465]: found 'b250:1' claiming
'/run/udev/links/\x2fdisk\x2fby-uuid\x2f0a270acb-56b8-4498-8bad-b3bb149fe869'
Nov 30 23:39:10.738370 ubuntu systemd-udevd[465]: creating link
'/dev/disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869' to '/dev/bcache1'
Nov 30 23:39:10.738380 ubuntu systemd-udevd[465]: preserve already existing
symlink '/dev/disk/by-uuid/0a270acb-56b8-4498-8bad-b3bb149fe869' to
'../../bcache1'
Nov 30 23:39:10.743215 ubuntu systemd-udevd[487]: LINK
'disk/by-uuid/92b0868d-7e56-4956-8e55-2c90ebee4a72'
/lib/udev/rules.d/60-persistent-storage.rules:79
Nov 30 23:39:10.743228 ubuntu systemd-udevd[487]: update old name,
'/dev/bcache/by-uuid/57e009b1-6bf4-42ea-abe0-334b10941a0b' no longer
belonging to '/devices/virtual/block/bcache0'
Nov 30 23:39:10.743247 ubuntu systemd-udevd[487]: no reference left, remove
'/dev/bcache/by-uuid/57e009b1-6bf4-42ea-abe0-334b10941a0b'
Nov 30 23:39:10.743291 ubuntu systemd-udevd[487]: found 'b250:0' claiming
'/run/udev/links/\x2fdisk\x2fby-uuid\x2f92b0868d-7e56-4956-8e55-2c90ebee4a72'
Nov 30 23:39:10.743302 ubuntu systemd-udevd[487]: creating link
'/dev/disk/by-uuid/92b0868d-7e56-4956-8e55-2c90ebee4a72' to '/dev/bcache0'
Nov 30 23:39:10.743312 ubuntu systemd-udevd[487]: preserve already existing
symlink '/dev/disk/by-uuid/92b0868d-7e56-4956-8e55-2c90ebee4a72' to
'../../bcache0'

It would seem that the 'no longer belonging to ...bcache1' is the trigger
for the removal
however, 250:1 is indeed bcache1 device.


# ls -al /dev/bcache1
brw-rw 1 root disk 250, 1 Nov 30 23:39 /dev/bcache1

Looking at the systemd/udev/udev-event.c it appears that for entries in
the current udev database that don't have a new event associated with them
get the call to remove the old link

void udev_event_execute_rules()
  ...
  if (major(udev_device_get_devnum(dev)) > 0) {
bool apply;

/* remove/update possible left-over symlinks from
old database entry */
if (event->dev_db != NULL)
udev_node_update_old_links(dev,
event->dev_db);


Will need to crawl through the db to see what the the event->dev_db entry
is and where that get's set.


On Thu, Nov 30, 2017 at 2:41 PM, Dmitrii Shcherbakov <
1729...@bugs.launchpad.net> wrote:

> Looks like masking systemd-udevd removes this behavior. Need to figure
> out where it actually clears everything out.
>
> ubuntu@maas-xenial4:~$ sudo systemctl mask systemd-udevd
> 11:32 PM Created symlink from /etc/systemd/system/systemd-udevd.service
> to /dev/null.
>
> # reboot
>
> ubuntu@maas-xenial4:~$ ls /dev/bcache/by-uuid/
> 2963855b-3d2b-4387-abd1-3ae788919de4  727212eb-0f0b-4d20-9191-f0577a38454e
> 835afacf-6213-48a9-864c-43733822668b  aa04ab39-a42c-446f-aff5-addbd9c80e06
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dmitrii Shcherbakov]

Looks like masking systemd-udevd removes this behavior. Need to figure
out where it actually clears everything out.

ubuntu@maas-xenial4:~$ sudo systemctl mask systemd-udevd
11:32 PM Created symlink from /etc/systemd/system/systemd-udevd.service to 
/dev/null.

# reboot

ubuntu@maas-xenial4:~$ ls /dev/bcache/by-uuid/
2963855b-3d2b-4387-abd1-3ae788919de4  727212eb-0f0b-4d20-9191-f0577a38454e  
835afacf-6213-48a9-864c-43733822668b  aa04ab39-a42c-446f-aff5-addbd9c80e06

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dmitrii Shcherbakov]

Ryan,

As discussed in IRC, I tweaked locations for testing in #11 and added
all paths in #14.

Looks like after `mount -n -o move /dev ${rootmnt}/dev` ${rootmnt}/dev
has the proper content (see the bcache rule as well)

https://paste.ubuntu.com/26082611/
== before ==
lrwxrwxrwx113 
/dev/bcache/by-uuid/aa04ab39-a42c-446f-aff5-addbd9c80e06 -> ../../bcache0
lrwxrwxrwx113 
/dev/bcache/by-uuid/835afacf-6213-48a9-864c-43733822668b -> ../../bcache3
lrwxrwxrwx113 
/dev/bcache/by-uuid/727212eb-0f0b-4d20-9191-f0577a38454e -> ../../bcache1
lrwxrwxrwx113 
/dev/bcache/by-uuid/2963855b-3d2b-4387-abd1-3ae788919de4 -> ../../bcache2

== after ==
lrwxrwxrwx113 
/root/dev/bcache/by-uuid/aa04ab39-a42c-446f-aff5-addbd9c80e06 -> ../../bcache0
lrwxrwxrwx113 
/root/dev/bcache/by-uuid/835afacf-6213-48a9-864c-43733822668b -> ../../bcache3
lrwxrwxrwx113 
/root/dev/bcache/by-uuid/727212eb-0f0b-4d20-9191-f0577a38454e -> ../../bcache1
lrwxrwxrwx113 
/root/dev/bcache/by-uuid/2963855b-3d2b-4387-abd1-3ae788919de4 -> ../../bcache2

So the problem must be further down.

And about the only thing I see in the init script is run-init from
klibc:

# Chain to real filesystem
exec run-init ${drop_caps} ${rootmnt} ${init} "$@" 
${recovery:+--startup-event=recovery} <${rootmnt}/dev/console 
>${rootmnt}/dev/console 2>&1

So it's either somewhere in run-init code

https://git.launchpad.net/~usd-import-
team/ubuntu/+source/klibc/tree/usr/kinit/run-
init/runinitlib.c?h=applied/ubuntu/xenial-updates#n158

or in systemd.

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Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

** Bug watch added: Debian Bug tracker #844775
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=844775

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Investigating why /dev doesn't have the correct links even if they're
present led me to look at
/usr/share/initramfs-tools/scripts/init-bottom/udev (provided via the udev
dpkg from systemd)

In there, the mount -n -o move is used to migrate the /dev from initramfs
to the rootfs/dev

This bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=844775

Indicated that the initramfs may have util-linux version of mount which
needs to use
mount --move  instead.  This is addressed in newer systemd packages (in
bionic for sure)

And the mount line now looks like this:


# move the /dev tmpfs to the rootfs; fall back to util-linux mount that does
# not understand -o move
mount -n -o move /dev ${rootmnt}/dev || mount -n --move /dev ${rootmnt}/dev

Let's see if that helps resolve the "missing" symlinks.


On Thu, Nov 30, 2017 at 10:27 AM, Ryan Harper 
wrote:

> So, /dev/bcache/by-uuid is not getting created.
>
> That's the same kernel bug I filed.
>
> And, if they were, I think they'd get moved properly.
>
> init-bottom/udev script does the following:
>
> # Stop udevd, we'll miss a few events while we run init, but we catch up
> udevadm control --exit
>
> # move the /dev tmpfs to the rootfs
> mount -n -o move /dev ${rootmnt}/dev
>
> That "move" operation migrates the entire mounted directory to a new
> location
> so, if /dev/bcache/by-uuid  existed, it would be present when systemd init
> runs.
>
> AFAICT, there's not fix here without the kernel side.
>
> On Thu, Nov 30, 2017 at 10:09 AM, Dmitrii Shcherbakov <
> 1729...@bugs.launchpad.net> wrote:
>
>> Just in case also checked with this rule that creates links at /dev
>> /dev/disk/by-uuid /dev/bcache/by-uuid https://paste.ubuntu.com/26081756/
>>
>> They are all there originally (see the screenshot).
>>
>> But not there afterwards. So it's not just a problem with a different
>> path.
>>
>> https://paste.ubuntu.com/26081775/
>>
>> ubuntu@maas-xenial4:~$ tree /dev/ | grep bcache
>> ├── bcache0
>> ├── bcache1
>> ├── bcache2
>> ├── bcache3
>> │   ├── 251:0 -> ../bcache0
>> │   ├── 251:1 -> ../bcache1
>> │   ├── 251:2 -> ../bcache2
>> │   ├── 251:3 -> ../bcache3
>> │   │   ├── bcache0 -> ../../bcache0
>> │   │   ├── bcache1 -> ../../bcache1
>> │   │   ├── bcache2 -> ../../bcache2
>> │   │   ├── bcache3 -> ../../bcache3
>>
>>
>> ** Attachment added: "bcache-multiple-links.png"
>>https://bugs.launchpad.net/ubuntu/+source/linux/+bug/172914
>> 5/+attachment/5016592/+files/bcache-multiple-links.png
>>
>> --
>> You received this bug notification because you are subscribed to the bug
>> report.
>> https://bugs.launchpad.net/bugs/1729145
>>
>> Title:
>>   /dev/bcache/by-uuid links not created after reboot
>>
>> To manage notifications about this bug go to:
>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145
>> /+subscriptions
>>
>
>

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [

Re: [Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

So, /dev/bcache/by-uuid is not getting created.

That's the same kernel bug I filed.

And, if they were, I think they'd get moved properly.

init-bottom/udev script does the following:

# Stop udevd, we'll miss a few events while we run init, but we catch up
udevadm control --exit

# move the /dev tmpfs to the rootfs
mount -n -o move /dev ${rootmnt}/dev

That "move" operation migrates the entire mounted directory to a new
location
so, if /dev/bcache/by-uuid  existed, it would be present when systemd init
runs.

AFAICT, there's not fix here without the kernel side.

On Thu, Nov 30, 2017 at 10:09 AM, Dmitrii Shcherbakov <
1729...@bugs.launchpad.net> wrote:

> Just in case also checked with this rule that creates links at /dev
> /dev/disk/by-uuid /dev/bcache/by-uuid https://paste.ubuntu.com/26081756/
>
> They are all there originally (see the screenshot).
>
> But not there afterwards. So it's not just a problem with a different
> path.
>
> https://paste.ubuntu.com/26081775/
>
> ubuntu@maas-xenial4:~$ tree /dev/ | grep bcache
> ├── bcache0
> ├── bcache1
> ├── bcache2
> ├── bcache3
> │   ├── 251:0 -> ../bcache0
> │   ├── 251:1 -> ../bcache1
> │   ├── 251:2 -> ../bcache2
> │   ├── 251:3 -> ../bcache3
> │   │   ├── bcache0 -> ../../bcache0
> │   │   ├── bcache1 -> ../../bcache1
> │   │   ├── bcache2 -> ../../bcache2
> │   │   ├── bcache3 -> ../../bcache3
>
>
> ** Attachment added: "bcache-multiple-links.png"
>https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+attachment/5016592/+files/bcache-multiple-links.png
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dmitrii Shcherbakov]

Just in case also checked with this rule that creates links at /dev
/dev/disk/by-uuid /dev/bcache/by-uuid https://paste.ubuntu.com/26081756/

They are all there originally (see the screenshot).

But not there afterwards. So it's not just a problem with a different
path.

https://paste.ubuntu.com/26081775/

ubuntu@maas-xenial4:~$ tree /dev/ | grep bcache
├── bcache0
├── bcache1
├── bcache2
├── bcache3
│   ├── 251:0 -> ../bcache0
│   ├── 251:1 -> ../bcache1
│   ├── 251:2 -> ../bcache2
│   ├── 251:3 -> ../bcache3
│   │   ├── bcache0 -> ../../bcache0
│   │   ├── bcache1 -> ../../bcache1
│   │   ├── bcache2 -> ../../bcache2
│   │   ├── bcache3 -> ../../bcache3


** Attachment added: "bcache-multiple-links.png"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145/+attachment/5016592/+files/bcache-multiple-links.png

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dmitrii Shcherbakov]

After booting with break=bottom kernel parameter I can see that symlinks
are in fact present at the initramfs stage.

They are gone afterwards post pivot_root & systemd start (the bcache dir
isn't even present while it was there)

ubuntu@maas-xenial4:~$ ls /dev/disk/
by-dname  by-id  by-label  by-path  by-uuid


** Attachment added: "bcache-symlinks-initramfs.png"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145/+attachment/5016556/+files/bcache-symlinks-initramfs.png

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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dimitri John Ledkov]

Let's assume there is a systemd fault here too, thus marking systemd as
affected. I will try to play around with this, but may get to this by
December 14th the earliest.

** Also affects: systemd (Ubuntu)
   Importance: Undecided
   Status: New

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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Triaged
Status in systemd source package in Xenial:
  New
Status in linux source package in Zesty:
  Triaged
Status in systemd source package in Zesty:
  New
Status in linux source package in Artful:
  Triaged
Status in systemd source package in Artful:
  New
Status in linux source package in Bionic:
  Triaged
Status in systemd source package in Bionic:
  New

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dmitrii Shcherbakov]

We do run udevd at the initramfs stage in init-top and stop it in init-
bottom:

➜  scripts git:(ubuntu/xenial-updates) ✗ grep -RiP udev
init-bottom/udev:# Stop udevd, we'll miss a few events while we run init, but 
we catch up
init-bottom/udev:udevadm control --exit

init-top/udev:SYSTEMD_LOG_LEVEL=$log_level /lib/systemd/systemd-udevd --daemon 
--resolve-names=never
init-top/udev:udevadm trigger --type=subsystems --action=add
init-top/udev:udevadm trigger --type=devices --action=add
init-top/udev:udevadm settle || true


And, from what I can see after adding some logging to the udev rule and 
updating initramfs, KOBJ_CHANGE events generated by the bcache driver are 
processed by 69-bcache.rules:

http://paste.ubuntu.com/26080228/ (rule)


https://paste.ubuntu.com/26080236/ (dmesg)
[1.789254] AFTER DRIVER BCACHE: devpath: /devices/virtual/block/bcache0 
UUID: dd563676-f731-420c-a65d-93992321eb14, LABEL:
[1.790563] AFTER DRIVER BCACHE: devpath: /devices/virtual/block/bcache1 
UUID: 3aec199f-d1d7-452f-a56d-9c946c72cae1, LABEL:
[1.794265] PROBING BCACHE /devices/virtual/block/bcache3
[1.795957] BEFORE DRIVER BCACHE /devices/virtual/block/bcache3
[1.798215] AFTER DRIVER BCACHE: devpath: /devices/virtual/block/bcache3 
UUID: 2c8f2de3-a1a5-4f53-ad00-09294eb19512, LABEL:
[1.801311] PROBING BCACHE /devices/virtual/block/bcache2
[1.803180] BEFORE DRIVER BCACHE /devices/virtual/block/bcache2
[1.804731] AFTER DRIVER BCACHE: devpath: /devices/virtual/block/bcache2 
UUID: dcdb4830-78f2-494a-905b-efa549b484fc, LABEL:

So the UUID is present in the environment of the CHANGE uevent but the
symlink is not present when I ssh into the system after the boot
process.


I wonder why that happens as devtmpfs mounted at /dev is moved to the new 
rootfs before init script exits and systemd is started - so if it's created on 
that devtmpfs, it should be there at the end:

https://git.launchpad.net/~usd-import-
team/ubuntu/+source/systemd/tree/debian/extra/initramfs-tools/scripts
/init-bottom/udev?h=applied/ubuntu/xenial-updates

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Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged
Status in linux source package in Zesty:
  Triaged
Status in linux source package in Artful:
  Triaged
Status in linux source package in Bionic:
  Triaged

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dmitrii Shcherbakov]

So, the kernel fix could look like this:

* instead of just failing with "device already registered"
* the kernel would emit another uevent with CACHED_UUID which would be 
processed another time to set up a symlink

It seems like this approach with "synthetic uevents" may be used for
other purposes as well with changes that landed in 4.13

http://elixir.free-electrons.com/linux/v4.14.2/source/Documentation/ABI/testing/sysfs-uevent
"Enable passing additional variables for synthetic uevents that are generated 
by writing /sys/.../uevent file

Recognized extended format is ACTION [UUID [KEY=VALUE ...]

Users: udev, userspace tools generating synthetic uevents"

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged
Status in linux source package in Zesty:
  Triaged
Status in linux source package in Artful:
  Triaged
Status in linux source package in Bionic:
  Triaged

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dmitrii Shcherbakov]

I reviewed this once again:

1. persistent /dev/bcache - not possible or needed due to how kernel 
enumeration works
2. our userspace handles /dev/by-dname/ properly so we just need 
CACHED_UUID given to us during coldplug in some way to properly create 
/dev/bcache/by-uuid/ symlinks and consequently by-dname symlinks. 

3. bcache, like almost all block device drivers, gets "struct
device_type disk_type" by using alloc_disk from genhd.c which gives us
standard contents for the uevent file. Partitions are a notable
exception and use "struct device_type part_type" which has a .uevent
field (http://elixir.free-electrons.com/linux/v4.14.2/source/block
/partition-generic.c#L223) that allows customization of uevent file
contents in a bus-, class- and type-specific manner (http://elixir.free-
electrons.com/linux/v4.14.2/source/drivers/base/core.c#L903).

cat /sys/class/block/nvme0n1/uevent  
MAJOR=259
MINOR=0
DEVNAME=nvme0n1
DEVTYPE=disk


as opposed to the following with partitions

cat /sys/class/block/nvme0n1p1/uevent 
MAJOR=259
MINOR=1
DEVNAME=nvme0n1p1
DEVTYPE=partition
PARTN=1
PARTNAME=Basic data partition


While we could have a new block device type of "bcache" with a custom uevent 
content that had CACHED_UUID of a superblock this would be a userspace breakage 
which is hardly upstreamable.

-- 
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged
Status in linux source package in Zesty:
  Triaged
Status in linux source package in Artful:
  Triaged
Status in linux source package in Bionic:
  Triaged

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dmitrii Shcherbakov]

** Tags added: cpe-onsite

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged
Status in linux source package in Zesty:
  Triaged
Status in linux source package in Artful:
  Triaged
Status in linux source package in Bionic:
  Triaged

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-16-generic N/A
   linux-backports-modules-4.13.0-16-generic  N/A
   linux-firmware N/A
  RfKill: Error: [Errno 2] 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dmitrii Shcherbakov]

There is a scenario where a real rootfs is located on a bcache device,
however, for that we need to register a bcache device at the initrd
stage which already happens now. Then we'd locate a file system on it
and do pivot_root and so on.

The bcache naming, I believe, is not guaranteed at this point unless
we have a rule that says so.

Side-tracking to our field use-cases, we need persistence in
/dev/bcache names based on superblock UUIDs. So, I expect
/dev/bcache/ names to be persisted by UUID on first discovery (which
corresponds to MAAS deploy stage, not commissioning as in case of disk
serial numbers).

However, we also expect bcache names to match names in MAAS which may
not happen in this scenario because  : bcache
mapping is not enforced.

Going back to https://bugs.launchpad.net/curtin/+bug/1728742, I think we
can break it down into two problems:

1. bcache device numbers are not static across reboots and we need a
static mapping of superblock UUID to bcache for a given device. This
requires CACHED_UUID to be present in uevent environment which is only
possible during a successful registration where this code path is
triggered. As a result of rootfs on bcache requirement, this makes sense
to do at the initrd stage before we have to do pivot_root to the real
rootfs.

Doing something like that when systemd is running post pivot_root and
/dev devtmpfs transfer to the real rootfs doesn't sound right to me as
we have this problem with double registration. In summary, I think
/dev/bcache/by-uuid/ symlinks for bcache devices that exist on initial
boot should be created via udev rules in initrd.

This is what this bug is about.

2. bcache device names may not match the ones in MAAS. This has
implications for our use of Juju Storage functionality when we need
device special files with static names without file systems or partition
tables present. After commissioning in MAAS there's already metadata
present about a given machine - disk serial numbers are gathered (if
present, this is not guaranteed and block driver-specific AFAIK but a
sane assumption to make) and device names that were assigned during
ephemeral image boot are presented and stored in a database with
associated serial numbers available for querying to set up dname
symlinks on deployment.

In order to make  : bcache mapping static we need
to essentially have a mapping of disk serial numbers to bcache
superblock UUIDs which are in turn mapped to bcache names.

I would say that https://bugs.launchpad.net/curtin/+bug/1728742 is about
p.2.



The rationale for p. 1 is that the init script sets up devtmpfs
initially which then gets moved over to the real rootfs (init-bottom
script) before pivot_root is performed. systemd then runs its mount
point set up code which checks if a given entry in its hard-coded table
of mount points is already a mount point and skips its setup if this is
the case. So anything set up during initrd stage will stay there after
systemd runs as devtmpfs is moved and reused.

https://git.launchpad.net/~usd-import-team/ubuntu/+source/systemd/tree/src/core/mount-setup.c?h=applied/ubuntu/xenial-updates#n77
  { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME,

path_is_mount_point -> fd_is_mount_point
https://git.launchpad.net/~usd-import-team/ubuntu/+source/systemd/tree/src/core/mount-setup.c?h=applied/ubuntu/xenial-updates#n161

static int mount_one(const MountPoint *p, bool relabel) {
...
r = path_is_mount_point(p->where, AT_SYMLINK_FOLLOW);
if (r < 0 && r != -ENOENT) {
log_full_errno((p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG, r, 
"Failed to determine whether %s is a mount point: %m", p->where);
return (p->mode & MNT_FATAL) ? r : 0;
}
if (r > 0)
return 0;


init script:
https://git.launchpad.net/~usd-import-team/ubuntu/+source/initramfs-tools/tree/init?h=applied/ubuntu/xenial-updates
[ -d /dev ] || mkdir -m 0755 /dev
...

# Note that this only becomes /dev on the real filesystem if udev's scripts
# are used; which they will be, but it's worth pointing out
if ! mount -t devtmpfs -o nosuid,mode=0755 udev /dev; then
 echo "W: devtmpfs not available, falling back to tmpfs for /dev"
 mount -t tmpfs -o nosuid,mode=0755 udev /dev
 [ -e /dev/console ] || mknod -m 0600 /dev/console c 5 1
 [ -e /dev/null ] || mknod /dev/null c 1 3
fi
...


init-bottom:
https://git.launchpad.net/~usd-import-team/ubuntu/+source/systemd/tree/debian/extra/initramfs-tools/scripts/init-bottom/udev?h=applied/ubuntu/xenial-updates

...
# move the /dev tmpfs to the rootfs
mount -n -o move /dev ${rootmnt}/dev

# create a temporary symlink to the final /dev for other initramfs scripts
if command -v nuke >/dev/null; then
  nuke /dev
else
  rm -rf /dev
fi
ln -s ${rootmnt}/dev /dev

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https://bugs.launchpad.net/bugs/1729145

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Dmitrii Shcherbakov]

Just to clarify on UUIDs - there are 3 types of UUIDs in question:

1. cache set UUIDs (upstream docs mention that multiple cache devices per cache 
set are not supported but a configuration with M:N as in 
: has been taken into account)
2. cache device superblock UUIDs;
3. backing device superblock UUIDs.

We are interested in uevents containing backing device superblock UUIDs
to reliably create by-uuid symlinks and, ideally, have persistent
/dev/bcache names based on those UUIDs (although the latter is out of
scope for this particular bug).

The following code in bcache-tools provides more clarity on how
suberblock UUIDs are generated in userspace:

https://github.com/g2p/bcache-tools/blob/v1.0.8/make-bcache.c#L448-L458 loops 
over cache devices and backing devices calling write_sb for each device
https://github.com/g2p/bcache-tools/blob/v1.0.8/make-bcache.c#L170-L174 
(write_sb which takes device type into account)
https://github.com/g2p/bcache-tools/blob/v1.0.8/make-bcache.c#L211-L221 - 
selects a type of suberblock which is either cache or backing device (cdev or 
bdev), writes bcache magic, generates a ***suberblock UUID***, writes a passed 
cache set UUID into in-memory suberblock representation along with block size 
and bucket size
https://github.com/g2p/bcache-tools/blob/v1.0.8/make-bcache.c#L284-L288 
(pwrites the in-memory representation to a given block device)

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged
Status in linux source package in Zesty:
  Triaged
Status in linux source package in Artful:
  Triaged
Status in linux source package in Bionic:
  Triaged

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Status: Confirmed => Triaged

** Changed in: linux (Ubuntu Artful)
   Status: Confirmed => Triaged

** Also affects: linux (Ubuntu Bionic)
   Importance: Medium
   Status: Triaged

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Zesty)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Zesty)
   Status: New => Triaged

** Changed in: linux (Ubuntu Xenial)
   Status: New => Triaged

** Changed in: linux (Ubuntu Zesty)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Medium

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged
Status in linux source package in Zesty:
  Triaged
Status in linux source package in Artful:
  Triaged
Status in linux source package in Bionic:
  Triaged

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

Mainline kernel does not help; it fails the same way and also has a bug
that's fixed in the Ubuntu kernel:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667078

Here's the details from the mainline test:

ubuntu@a-unsolar-melonie:~$ dpkg --list | grep linux-image
ii  linux-image-4.13.0-16-generic  4.13.0-16.19 
amd64Linux kernel image for version 4.13.0 on 64 bit x86 SMP
ii  linux-image-4.14.0-041400rc7-generic   4.14.0-041400rc7.201710292231
amd64Linux kernel image for version 4.14.0 on 64 bit x86 SMP
ii  linux-image-virtual4.13.0.16.17 
amd64Virtual Linux kernel image
ubuntu@a-unsolar-melonie:~$ uname -r
4.14.0-041400rc7-generic
ubuntu@a-unsolar-melonie:~$ uname -a
Linux a-unsolar-melonie 4.14.0-041400rc7-generic #201710292231 SMP Sun Oct 29 
22:32:07 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
ubuntu@a-unsolar-melonie:~$ ls -al /dev/bcache*
brw-rw 1 root disk 251,  0 Nov  1 14:45 /dev/bcache0
brw-rw 1 root disk 251, 16 Nov  1 14:45 /dev/bcache16
brw-rw 1 root disk 251, 32 Nov  1 14:45 /dev/bcache32
ubuntu@a-unsolar-melonie:~$ dmesg | grep bcache
[3.099823] bcache: register_bdev() registered backing device vdb4
[3.159769] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 2
[3.170818] bcache: register_cache() registered cache device vdb1
[3.173682] bcache: register_bdev() registered backing device vdb3
[3.183034] bcache: register_bdev() registered backing device vdb2
[8.271351] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
[8.296933] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
[8.345949] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
[8.353927] bcache: register_bcache() error opening /dev/vdb4: device 
already registered


** Tags added: kernel-bug-exists-upstream

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Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Artful:
  Confirmed

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

This fails on Xenial -> Artful.  I've not yet tested Trusty, but I
suspect it's just a latent bug in the bcache driver.

I'll grab the upstream kernel and provide results.

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Artful:
  Confirmed

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-16-generic N/A
   linux-backports-modules-4.13.0-16-generic  N/A
   linux-firmware N/A
  RfKill: Error: [Errno 2] No 

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Joseph Salisbury]

Did this issue start happening after an update/upgrade?  Was there a
prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.14 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14-rc7

** Tags added: kernel-da-key

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Also affects: linux (Ubuntu Artful)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Artful)
   Status: New => Confirmed

** Changed in: linux (Ubuntu Artful)
   Importance: Undecided => Medium

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Artful:
  Confirmed

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  

[Kernel-packages] [Bug 1729145] Re: /dev/bcache/by-uuid links not created after reboot

[Ryan Harper]

To recreate:

Add a second disk (any size will do) and split the disk into 4 equal
partitions.  Then

make-bcache -C /dev/vdb1
make-bcache -B /dev/vdb2
make-bcache -B /dev/vdb3
make-bcache -B /dev/vdb4

Note, you can see the proper symlinks created at this time:

ls -al /dev/bcache/by-uuid/

Reboot

ls -al /dev/bcache/by-uuid does not exist only /dev/bcache{0,1,2}

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145

Title:
  /dev/bcache/by-uuid links not created after reboot

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  1. $ lsb_release -rd
  Description:  Ubuntu 17.10
  Release:  17.10

  2. $ apt-cache policy linux-image-`uname -r`
  linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
   *** 4.13.0-16.19 500
  500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64 
Packages
  100 /var/lib/dpkg/status

  3. After creating some bcache devices and rebooting 
/dev/bcache/by-uuid/ -> ../../bcacheN
  symlinks point to the current bcache device which is caching the dev.uuid 
found after creating a backing device.

  4. /dev/bcache/by-uuid does not exist and there are not symlinks
  underneath

  
  It appears that since the initramfs loads the bcache module which probes and 
finds all of the cache devices and backing devices then once the rootfs is 
mounted and udev gets to run, the bcache kernel module does not emit the 
CACHED_UUID value into the environment if the underlying devices are already 
registered.

  In dmesg, one can see that prior to mounting the rootfs, we see bcache
  register events:

  [5.333973] bcache: register_bdev() registered backing device vdb2
  [5.354138] bcache: register_bdev() registered backing device vdb4
  [5.365665] bcache: register_bdev() registered backing device vdb3
  [5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1 
entries, seq 1
  [5.428683] bcache: register_cache() registered cache device vdb1

  then rootfs ismounted and systemd starts systemd-udev

  [9.350889] systemd[1]: Listening on udev Kernel Socket.

  And then the coldplug replay of kernel events triggers 
/lib/udev/rules.d/69-bcache.rules
  which invokes /lib/udev/bcache-register which writes the device name 
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the 
bcache kernel driver attempting to register the block device.  However, there 
is already a bcache device associated already and registration fails

  [   11.173141] bcache: register_bcache() error opening /dev/vdb2: device 
already registered
  [   11.184617] bcache: register_bcache() error opening /dev/vdb3: device 
already registered
  [   11.199130] bcache: register_bcache() error opening /dev/vdb1: device 
already registered
  [   11.271694] bcache: register_bcache() error opening /dev/vdb4: device 
already registered

  The problem then is that only a kernel call to bch_cached_dev_run()
  which happens like this:

  bcache_register()
register_bdev()
  bch_cached_dev_run()
kobject_uevent_env(_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);

  where env includes: 
  "DRIVER=bcache",
  kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
  NULL,
  NULL,
  };

  Since that event is not emitted for any previously registered device,
  then the symlink will not be created.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-generic 4.13.0-16.19
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw 1 root audio 116,  1 Oct 31 22:09 seq
   crw-rw 1 root audio 116, 33 Oct 31 22:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Wed Nov  1 01:39:01 2017
  Ec2AMI: ami-030b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions: