It took a while, but v4.15-rc6 fails; so we need to move back a bit.
[ 2541.139904] bcache: bcache_device_free() bcache0 stopped
[ 2541.141848] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000d38
[ 2541.143813] IP: search_free+0ex01-b6435-e1/5f0x40 [bcache]
[ 2541.145676] PGD 0 P4D 0
[ 2541.146493] Oops: 0000 [#58] SMP
[ 2541.147509] Modules linked in: bcache nls_utf8 isofs nls_iso8859_1
ppdev kvm_intel kvm irqbypass joydev input_leds parport_pc parport
mac_hid serio_raw sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core
iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi virtio_rng
ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456
async_raid6_recov async_memcpy async_pq async_xor async_tx xor
raid6_pq libcrc32c raid1 raid0 multipath linear psmouse virtio_net
virtio_scsi virtio_blk i2c_piix4 pata_acpi floppy
[ 2541.154248] CPU: 3 PID: 13332 Comm: kworker/3:200 Tainted: G D
4.15.0-041500rc6-generic #201712312330
[ 2541.156921] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[ 2541.159381] Workqueue: bcache bch_data_insert_keys [bcache]
[ 2541.160566] RIP: 0010:search_free+0x31/0x40 [bcache]
[ 2541.161300] RSP: 0018:ffffb04e45b6bdf8 EFLAGS: 00010282
[ 2541.162098] RAX: 0000000000000000 RBX: ffff942c22b3b390 RCX: 0000000180100006
[ 2541.163791] RDX: 0000000180100007 RSI: ffffded4c086a7c0 RDI: ffff942c22b3b390
[ 2541.165486] RBP: ffffb04e45b6be00 R08: ffff942c21a9fc00 R09: 0000000180100006
[ 2541.167191] R10: ffffb04e45b6bd70 R11: ffff942c3ffb4000 R12: ffff942c39610010
[ 2541.168897] R13: ffff942c22b3b518 R14: ffff942c3fda3080 R15: ffff942c26b526c0
[ 2541.170637] FS: 0000000000000000(0000) GS:ffff942c3fd80000(0000)
knlGS:0000000000000000
[ 2541.172574] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2541.174043] CR2: 0000000000000d38 CR3: 0000000011409000 CR4: 00000000000006e0
[ 2541.175847] Call Trace:
[ 2541.176349] cached_dev_cache_miss_done+0x38/0x80 [bcache]
[ 2541.177131] closure_put+0x8b/0xc0 [bcache]
[ 2541.177791] closure_sub+0x6f/0xc0 [bcache]
[ 2541.178924] bch_data_insert_keys+0xd8/0x130 [bcache]
[ 2541.180107] process_one_work+0x1ea/0x410
[ 2541.181176] worker_thread+0x32/0x410
[ 2541.182157] kthread+0x11e/0x140
[ 2541.183043] ? process_one_work+0x410/0x410
[ 2541.184154] ? kthread_create_worker_on_cpu+0x70/0x70
[ 2541.185460] ret_from_fork+0x1f/0x30
[ 2541.186397] Code: 48 89 e5 53 48 89 fb e8 0e ff ff ff 48 8b bb 68
01 00 00 48 85 ff 74 05 e8 cd 0b d0 f5 48 8b 83 e8 00 00 00 48 89 df
48 8b 40 70 <48> 8b b0 38 0d 00 00 e8 c3 18 a9 f5 5b 5d c3 0f 1f 44 00
00 55
[ 2541.189920] RIP: search_free+0x31/0x40 [bcache] RSP: ffffb04e45b6bdf8
[ 2541.191636] CR2: 0000000000000d38
[ 2541.192503] ---[ end trace e2b7818e7472ac25 ]---
On Mon, Nov 26, 2018 at 8:26 PM Joseph Salisbury
<[email protected]> wrote:
>
> Can you confirm that v4.15-rc6 does not exhibit the bug? That will
> ensure I'm reviewing the correct commits:
>
> http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc6/
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1784665
>
> Title:
> mkfs.ext4 over /dev/bcache0 hangs
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784665/+subscriptions
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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/1784665
Title:
mkfs.ext4 over /dev/bcache0 hangs
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
In Progress
Status in linux source package in Cosmic:
In Progress
Bug description:
$ cat /proc/version_signature
Ubuntu 4.15.0-29.31-generic 4.15.18
$ lsb_release -rd
Description: Ubuntu Cosmic Cuttlefish (development branch)
Release: 18.10
$ apt-cache policy linux-image-`uname -r`
linux-image-4.15.0-29-generic:
Installed: 4.15.0-29.31
Candidate: 4.15.0-29.31
Version table:
*** 4.15.0-29.31 500
500 http://archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
100 /var/lib/dpkg/status
3) mkfs.ext4 /dev/bcache0 returns successful creating an ext4 filesystem on
top of a bcache device
4) mkfs.ext4 doesn't return and kernel prints hung process info
[ 58.018099] cloud-init[920]: Running command ['mkfs.ext4', '-F', '-L',
'root-fs', '-U', 'f01aec97-9457-11e8-b8d6-525400123401', '/dev/bcache0'] with
allowed return codes [0] (capture=True)
[ 242.652018] INFO: task kworker/u4:0:5 blocked for more than 120 seconds.
[ 242.653767] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 242.655391] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 242.657397] INFO: task kworker/0:2:410 blocked for more than 120 seconds.
[ 242.659126] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 242.660980] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 242.663000] INFO: task bcache_allocato:2326 blocked for more than 120
seconds.
[ 242.664807] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 242.666516] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 242.668503] INFO: task bcache_writebac:2345 blocked for more than 120
seconds.
[ 242.670301] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 242.671936] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 242.673909] INFO: task mkfs.ext4:2803 blocked for more than 120 seconds.
[ 242.675414] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 242.677038] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 363.483998] INFO: task kworker/u4:0:5 blocked for more than 120 seconds.
[ 363.488441] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 363.489598] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 363.491043] INFO: task kworker/0:2:410 blocked for more than 120 seconds.
[ 363.492252] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 363.494085] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 363.495659] INFO: task bcache_allocato:2326 blocked for more than 120
seconds.
[ 363.496957] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 363.498454] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 363.499866] INFO: task bcache_writebac:2345 blocked for more than 120
seconds.
[ 363.501156] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 363.502597] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 363.504048] INFO: task mkfs.ext4:2803 blocked for more than 120 seconds.
[ 363.505505] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 363.506677] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
System has two virtio block devices. bcache was created like so:
make-bcache -C /dev/vdb
make-bcache -B /dev/vda2
resulting in /dev/bcache0
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.15.0-29-generic 4.15.0-29.31
ProcVersionSignature: User Name 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jul 31 15:52 seq
crw-rw---- 1 root audio 116, 33 Jul 31 15:52 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.10-0ubuntu7
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: Tue Jul 31 15:53:56 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
PciMultimedia:
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-29-generic
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
RelatedPackageVersions:
linux-restricted-modules-4.15.0-29-generic N/A
linux-backports-modules-4.15.0-29-generic N/A
linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: 1.11.1-1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-bionic
dmi.modalias:
dmi:bvnSeaBIOS:bvr1.11.1-1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-bionic:cvnQEMU:ct1:cvrpc-i440fx-bionic:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-bionic
dmi.sys.vendor: QEMU
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