[Bug 1837788] Re: bcache kernel warning when attaching device

2019-09-02 Thread Launchpad Bug Tracker
This bug was fixed in the package linux - 5.0.0-27.28

---
linux (5.0.0-27.28) disco; urgency=medium

  * disco/linux: 5.0.0-27.28 -proposed tracker (LP: #1840816)

  * [Potential Regression] System crashes when running ftrace test in
ubuntu_kernel_selftests (LP: #1840750)
- x86/kprobes: Set instruction page as executable

linux (5.0.0-26.27) disco; urgency=medium

  * disco/linux: 5.0.0-26.27 -proposed tracker (LP: #1839972)

  * Packaging resync (LP: #1786013)
- [Packaging] update helper scripts

  * alsa/hdmi: add icelake hdmi audio support for a Dell machine (LP: #1836916)
- ALSA: hda: hdmi - add Icelake support
- ALSA: hda/hdmi - Remove duplicated define
- ALSA: hda/hdmi - Fix i915 reverse port/pin mapping

  * input/mouse: alps trackpoint-only device doesn't work (LP: #1836752)
- Input: alps - don't handle ALPS cs19 trackpoint-only device
- Input: alps - fix a mismatch between a condition check and its comment

  * [18.04 FEAT] Enhanced hardware support (LP: #1836857)
- s390: report new CPU capabilities
- s390: add alignment hints to vector load and store

  * System does not auto detect disconnection of external monitor (LP: #1835001)
- drm/i915: Add support for retrying hotplug
- drm/i915: Enable hotplug retry

  * [18.04 FEAT] Enhanced CPU-MF hardware counters - kernel part (LP: #1836860)
- s390/cpum_cf: Add support for CPU-MF SVN 6
- s390/cpumf: Add extended counter set definitions for model 8561 and 8562

  * EeePC 1005px laptop backlight is off after system boot up (LP: #1837117)
- platform/x86: asus-wmi: Only Tell EC the OS will handle display hotkeys 
from
  asus_nb_wmi

  * br_netfilter: namespace sysctl operations (LP: #1836910)
- netfilter: bridge: port sysctls to use brnf_net
- netfilter: bridge: namespace bridge netfilter sysctls
- netfilter: bridge: prevent UAF in brnf_exit_net()

  * ideapad_laptop disables WiFi/BT radios on Lenovo Y540 (LP: #1837136)
- platform/x86: ideapad-laptop: Remove no_hw_rfkill_list

  * shiftfs: allow overlayfs (LP: #1838677)
- SAUCE: shiftfs: enable overlayfs on shiftfs

  * bcache: bch_allocator_thread(): hung task timeout (LP: #1784665)
- bcache: never writeback a discard operation
- bcache: improve bcache_reboot()
- SAUCE: bcache: fix deadlock in bcache_allocator

  * Regressions in CMA allocation rework (LP: #1839395)
- dma-contiguous: do not overwrite align in dma_alloc_contiguous()
- dma-contiguous: page-align the size in dma_free_contiguous()

  * CVE-2019-3900
- vhost: introduce vhost_exceeds_weight()
- vhost_net: fix possible infinite loop
- vhost: vsock: add weight support
- vhost: scsi: add weight support

  * Disco update: 5.0.21 upstream stable release (LP: #1837518)
- bonding/802.3ad: fix slave link initialization transition states
- cxgb4: offload VLAN flows regardless of VLAN ethtype
- inet: switch IP ID generator to siphash
- ipv4/igmp: fix another memory leak in igmpv3_del_delrec()
- ipv4/igmp: fix build error if !CONFIG_IP_MULTICAST
- ipv6: Consider sk_bound_dev_if when binding a raw socket to an address
- ipv6: Fix redirect with VRF
- llc: fix skb leak in llc_build_and_send_ui_pkt()
- mlxsw: spectrum_acl: Avoid warning after identical rules insertion
- net: dsa: mv88e6xxx: fix handling of upper half of STATS_TYPE_PORT
- net: fec: fix the clk mismatch in failed_reset path
- net-gro: fix use-after-free read in napi_gro_frags()
- net: mvneta: Fix err code path of probe
- net: mvpp2: fix bad MVPP2_TXQ_SCHED_TOKEN_CNTR_REG queue value
- net: phy: marvell10g: report if the PHY fails to boot firmware
- net: sched: don't use tc_action->order during action dump
- net: stmmac: fix reset gpio free missing
- r8169: fix MAC address being lost in PCI D3
- usbnet: fix kernel crash after disconnect
- net/mlx5: Avoid double free in fs init error unwinding path
- tipc: Avoid copying bytes beyond the supplied data
- net/mlx5: Allocate root ns memory using kzalloc to match kfree
- net/mlx5e: Disable rxhash when CQE compress is enabled
- net: stmmac: fix ethtool flow control not able to get/set
- net: stmmac: dma channel control register need to be init first
- bnxt_en: Fix aggregation buffer leak under OOM condition.
- bnxt_en: Fix possible BUG() condition when calling pci_disable_msix().
- bnxt_en: Reduce memory usage when running in kdump kernel.
- net/tls: fix state removal with feature flags off
- net/tls: don't ignore netdev notifications if no TLS features
- cxgb4: Revert "cxgb4: Remove SGE_HOST_PAGE_SIZE dependency on page size"
- net: correct zerocopy refcnt with udp MSG_MORE
- crypto: vmx - ghash: do nosimd fallback manually
- xen/pciback: Don't disable PCI_COMMAND on PCI device reset.
- Revert "tipc: fix modprobe tipc failed after switch order of device
  registration"
- 

[Bug 1837788] Re: bcache kernel warning when attaching device

2019-08-21 Thread Mauricio Faria de Oliveira
Verification successful with bionic-proposed.
No warning nor oops anymore.

# uname -rv
4.15.0-59-generic #66-Ubuntu SMP Wed Aug 14 10:56:44 UTC 2019

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[  105.696881] bcache: register_bdev() registered backing device loop0
[  105.703809] bcache: run_cache_set() invalidating existing data
[  105.714280] bcache: register_cache() registered cache device loop1
[  109.677765] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on set 
3fd195b5-7334-4759-81d9-0faadc042f59
# 

# reboot
# # comment last line in script.

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[   21.645209] bcache: register_bdev() registered backing device loop0
[   21.697858] bcache: run_cache_set() invalidating existing data
[   21.709142] bcache: register_cache() registered cache device loop1
# sleep 10
# 

** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-08-20 Thread Ubuntu Kernel Bot
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

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-08-15 Thread Mauricio Faria de Oliveira
Verification successful with disco-proposed.
No warning nor oops anymore.

# rmadison -s disco-proposed linux
 linux | 5.0.0-26.27 | disco-proposed | source

# uname -rv
5.0.0-26-generic #27-Ubuntu SMP Tue Aug 13 17:47:39 UTC 2019

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[  171.879953] bcache: register_bdev() registered backing device loop0
[  171.920116] bcache: run_cache_set() invalidating existing data
[  171.931843] bcache: register_cache() registered cache device loop1
[  175.906911] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on set 
18fa9221-da9c-4e69-8b23-6eb093030c30

# reboot
# # comment last line in script.

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[   91.990987] bcache: register_bdev() registered backing device loop0
[   94.001825] bcache: run_cache_set() invalidating existing data
[   94.018920] bcache: register_cache() registered cache device loop1
# sleep 10
#

** Tags removed: verification-needed-disco
** Tags added: verification-done-disco

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-08-15 Thread Ubuntu Kernel Bot
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-
disco' to 'verification-done-disco'. If the problem still exists, change
the tag 'verification-needed-disco' to 'verification-failed-disco'.

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-disco

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-08-11 Thread Khaled El Mously
** Changed in: linux (Ubuntu Disco)
   Status: In Progress => Fix Committed

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-29 Thread Mauricio Faria de Oliveira
Patches sent to the kernel-team mailing list:

[B][PATCH] bcache: only set BCACHE_DEV_WB_RUNNING when cached device attached
https://lists.ubuntu.com/archives/kernel-team/2019-July/102653.html

[D][PATCH] bcache: only set BCACHE_DEV_WB_RUNNING when cached device attached
https://lists.ubuntu.com/archives/kernel-team/2019-July/102654.html

** Description changed:

+ [Impact]
+ 
+  * Users can get a Warning or even Oops the kernel if
+bcache/writeback_percent is set before attaching a
+caching device to the bcache device.
+ 
+  * The fix is trivial, upstream, and consists of just
+checking whether the caching device is attached in
+order to set flags and schedule thread (which oops).
+ 
+ [Test Case]
+ 
+  * See attachment 'setup-bcache-wb_percent-before-attach.sh'
+used in comment #5 and #6 to reproduce the problem(s).
+ 
+  * for 'Warning':
+ 
+# make-bcache -B 
+# make-bcache -C 
+# echo 11 > /sys/block//bcache/writeback_percent
+# sleep 1
+# echo  > /sys/block//bcache/attach
+ 
+  * for 'Oops':
+(steps above, but don't run last command / 'attach').
+ 
+ [Regression Potential]
+ 
+  * Low. The fix is trivial, contained, and exclusive to bcache sysfs
+ handler.
+ 
+  * The modified path has been exercised with synthetic testing (script).
+ 
+ [Original Bug Description]
+ 
  See attached dmesg, each time this server is rebooted it emits a
  concerning bcache warning.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-54-generic 4.15.0-54.58
  ProcVersionSignature: Ubuntu 4.15.0-54.58-generic 4.15.18
  Uname: Linux 4.15.0-54-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
k4.15.0-54-generic.
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/hwC0D2', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D3c', 
'/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', 
'/dev/snd/controlC0', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D3p', 
'/dev/snd/controlC1', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer': 
'amixer'
  Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer': 
'amixer'
  Card1.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer': 
'amixer'
  Card1.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer': 
'amixer'
  Date: Wed Jul 24 12:28:06 2019
  InstallationDate: Installed on 2013-10-04 (2119 days ago)
  InstallationMedia: Ubuntu-Server 13.10 "Saucy Salamander" - Beta amd64 
(20130925.1)
  MachineType: Supermicro X9DAi
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-54-generic 
root=UUID=8577302d-1f37-40a6-afcd-385beb26059f ro nomodeset elevator=deadline 
nvme_core.default_ps_max_latency_us=0 nopti noibrs noibpb
  RelatedPackageVersions:
-  linux-restricted-modules-4.15.0-54-generic N/A
-  linux-backports-modules-4.15.0-54-generic  N/A
-  linux-firmware 1.173.9
+  linux-restricted-modules-4.15.0-54-generic N/A
+  linux-backports-modules-4.15.0-54-generic  N/A
+  linux-firmware 1.173.9
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2018-06-09 (409 days ago)
  dmi.bios.date: 05/09/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3.2
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X9DAi
  dmi.board.vendor: Supermicro
  dmi.board.version: 0123456789
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 0123456789
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3.2:bd05/09/2015:svnSupermicro:pnX9DAi:pvr0123456789:rvnSupermicro:rnX9DAi:rvr0123456789:cvnSupermicro:ct3:cvr0123456789:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: X9DAi
  dmi.product.version: 0123456789
  dmi.sys.vendor: Supermicro

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

** Changed in: linux (Ubuntu Disco)
   Status: Confirmed => In Progress

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-29 Thread Mauricio Faria de Oliveira
Attaching test-case script.

** Attachment added: "setup-bcache-wb_percent-before-attach.sh"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1837788/+attachment/5279850/+files/setup-bcache-wb_percent-before-attach.sh

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-29 Thread Mauricio Faria de Oliveira
Tested with disco-proposed + patch (problem does not happen)
---

# uname -rv
5.0.0-22-generic #23+test20190725b1 SMP Mon Jul 29 14:43:55 -03 2019

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[   69.567775] bcache: register_bdev() registered backing device loop0/null 
2>&1 
[   69.577141] bcache: run_cache_set() invalidating existing data
[   69.591172] bcache: register_cache() registered cache device loop1
[   69.591517] bcache: register_bcache() error /dev/loop0: device already 
registered (emitting change event)
[   73.570620] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on set 
0ed05289-ed85-40da-bcf4-3991f2e18e03
#

(no warning message)

# reboot
# # comment last line in script.

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
#

[   40.045968] bcache: register_bdev() registered backing device loop0ev/null 
2>&
[   40.050914] bcache: run_cache_set() invalidating existing data
[   40.060793] bcache: register_cache() registered cache device loop1
[   40.068735] bcache: register_bcache() error /dev/loop1: device already 
registered

(wait a few seconds)
(ok no oops anymore)

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-25 Thread Mauricio Faria de Oliveira
Tested with bionic-proposed + patch (problem does not happen)
---

Test kernel available in:
  
https://people.canonical.com/~mfo/lp1837788/linux_4.15.0-56.62+test20190725b1_amd64/

# uname -rv
4.15.0-56-generic #62+test20190725b1 SMP Thu Jul 25 12:44:16 -03 2019

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
#
[   61.772497] bcache: register_bdev() registered backing device loop0/null 
2>&1 
[   61.789479] bcache: run_cache_set() invalidating existing data
[   61.799599] bcache: register_cache() registered cache device loop1
[   65.772621] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on set 
2c09c59b-35b1-4da7-8225-d143c1ea81d2

# reboot
# # comment last line in script.

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
#
[   36.853197] bcache: register_bdev() registered backing device loop0/null 
2>&1 
[   36.885302] bcache: run_cache_set() invalidating existing data
[   36.896425] bcache: register_cache() registered cache device loop1
(wait a few seconds)
(ok no oops anymore)

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-25 Thread Mauricio Faria de Oliveira
** Also affects: linux (Ubuntu Eoan)
   Importance: Undecided
 Assignee: Mauricio Faria de Oliveira (mfo)
   Status: Confirmed

** Also affects: linux (Ubuntu Disco)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Eoan)
   Status: Confirmed => Invalid

** Changed in: linux (Ubuntu Disco)
 Assignee: (unassigned) => Mauricio Faria de Oliveira (mfo)

** Changed in: linux (Ubuntu Bionic)
 Assignee: (unassigned) => Mauricio Faria de Oliveira (mfo)

** Changed in: linux (Ubuntu Bionic)
   Status: New => Confirmed

** Changed in: linux (Ubuntu Disco)
   Status: New => Confirmed

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-25 Thread Mauricio Faria de Oliveira
Tested with disco-proposed (problem exists)
-

# uname -rv
5.0.0-22-generic #23-Ubuntu SMP Tue Jul 23 17:23:54 UTC 2019

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[   57.992319] bcache: register_bdev() registered backing device loop0/null 2>&1
[   57.997331] bcache: run_cache_set() invalidating existing data
[   58.009201] bcache: register_cache() registered cache device loop1
[   58.009232] bcache: register_bcache() error /dev/loop0: device already 
registered (emitting change event)
[   62.008954] WARNING: CPU: 2 PID: 1294 at drivers/md/bcache/writeback.c:837 
bch_cached_dev_writeback_start+0x156/0x164 [bcache]
[   62.014280] Modules linked in: bcache crc64 isofs nls_iso8859_1 kvm_intel 
kvm irqbypass input_leds joydev serio_raw sch_fq_codel ib_iser
rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi 
scsi_transport_iscsi ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid$
56 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq 
libcrc32c raid1 raid0 multipath linear psmouse virtio_blk virtio$
net net_failover failover floppy
[   62.027201] CPU: 2 PID: 1294 Comm: setup-bcache-wb Not tainted 
5.0.0-22-generic #23-Ubuntu
[   62.029611] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.10.2-1ubuntu1 04/01/2014
[   62.032236] RIP: 0010:bch_cached_dev_writeback_start+0x156/0x164 [bcache]
[   62.034227] Code: 88 4c 0d 00 00 74 09 8b 83 e0 0c 00 00 5b 5d c3 48 8b 35 
35 ee b6 e0 48 8d 93 08 0c 00 00 bf 00 20 00 00 e8 7c 81 3e d$
 eb dd <0f> 0b e9 55 ff ff ff b8 f4 ff ff ff eb 8c 48 c7 c7 e0 e1 8c c0 e8
[   62.039605] RSP: 0018:ae25012a3d38 EFLAGS: 00010207
[   62.042135] RAX: 8ae1b1e915c0 RBX: 8ae1b20d RCX: 
[   62.045616] RDX:  RSI: 8ae1b7b270a0 RDI: 8ae1b7403800
[   62.049086] RBP: ae25012a3d40 R08: 000270a0 R09: 9fcbc4cb
[   62.052583] R10: d2e708ce0bc0 R11: 0001 R12: 8ae1b20d0010
[   62.056077] R13: 8ae1b20d R14: 8ae1b20d0c30 R15: 8ae1b218
[   62.059568] FS:  7f1d4770e540() GS:8ae1b7b0() 
knlGS:
[   62.063629] CS:  0010 DS:  ES:  CR0: 80050033
[   62.066534] CR2: 557518fb58f0 CR3: 0002333fa000 CR4: 06e0
[   62.070048] Call Trace:
[   62.071530]  bch_cached_dev_attach+0x356/0x480 [bcache]
[   62.074201]  ? bch_keybuf_init+0x70/0x70 [bcache]
[   62.07]  __cached_dev_store+0x59f/0x8b0 [bcache]
[   62.079234]  bch_cached_dev_store+0x39/0xc0 [bcache]
[   62.081786]  sysfs_kf_write+0x3b/0x40
[   62.083785]  kernfs_fop_write+0x12e/0x1b0
[   62.085921]  __vfs_write+0x1b/0x40
[   62.087809]  vfs_write+0xab/0x1b0
[   62.089649]  ksys_write+0x5c/0xd0
[   62.091497]  __x64_sys_write+0x1a/0x20
[   62.093520]  do_syscall_64+0x5a/0x110
[   62.095523]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   62.098106] RIP: 0033:0x7f1d4720e154
[   62.100071] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 
00 66 90 48 8d 05 b1 07 2e 00 8b 00 85 c0 75 13 b8 01 00 00 00
 0f 05 <48> 3d 00 f0 ff ff 77 54 f3 c3 66 90 41 54 55 49 89 d4 53 48 89 f5
[   62.108931] RSP: 002b:7ffddf05ed58 EFLAGS: 0246 ORIG_RAX: 
0001
[   62.112761] RAX: ffda RBX: 557518fb37f0 RCX: 7f1d4720e154
[   62.116233] RDX: 0025 RSI: 557518fb37f0 RDI: 0001
[   62.119751] RBP: 0025 R08: f000 R09: 557518fb594d
[   62.123233] R10: 01b6 R11: 0246 R12: 0001
[   62.126711] R13: 0025 R14: 7fff R15: 7ffddf060f39
[   62.130191] ---[ end trace c47ed79da668a296 ]---
[   62.135336] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on set 
7abc55ca-0c2d-44bb-ae1e-dd51a6028769

# reboot
# # comment last line in script.

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
#

[   30.327906] bcache: register_bdev() registered backing device loop0  

[   30.397705] bcache: run_cache_set() invalidating existing data
[   30.409402] bcache: register_cache() registered cache device loop1
(wait a few seconds)
[   38.603598] BUG: unable to handle kernel NULL pointer dereference at 
0340
[   38.607376] #PF error: [normal kernel read fault]
[   38.609705] PGD 0 P4D 0
[   38.611045] Oops:  [#1] SMP PTI
[   38.612835] CPU: 2 PID: 53 Comm: kworker/2:1 Not tainted 5.0.0-22-generic 
#23-Ubuntu
[   38.616264] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.10.2-1ubuntu1 04/01/2014
[   38.618928] Workqueue: events update_writeback_rate [bcache]
[   38.620658] RIP: 0010:update_writeback_rate+0x36/0x330 [bcache]
[   38.622436] Code: 56 41 55 41 54 53 48 83 ec 08 4c 8b af 10 f4 ff ff f0 80 
8f 30 f4 ff ff 10 f0 83 44 24 fc 00 48 8b 87 30 f4 ff ff a8 0$
 74 59 <49> 8b 85 40 03 00 00 48 c1 e8 03 83 e0 01 49 89 c4 75 46 8b 47 e8
[   38.627822] RSP: 

[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-25 Thread Mauricio Faria de Oliveira
Tested with eoan-proposed (problem does not exist)


root@bionic-bcache:~# uname -rv
5.2.0-9-generic #10-Ubuntu SMP Sat Jul 20 14:05:52 UTC 2019

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[   54.032674] bcache: register_bdev() registered backing device loop0
[   54.036972] bcache: run_cache_set() invalidating existing data
[   54.051598] bcache: register_cache() registered cache device loop1
[   54.065354] bcache: register_bcache() error /dev/loop1: device already 
registered
[   58.038440] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on set 
cae17283-45ee-4aa1-9fb1-00ad889c02e5


# reboot
# # comment last line in script.

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[   28.140043] bcache: register_bdev() registered backing device loop0
[   41.927908] bcache: bcache_device_free() bcache0 stopped
[   77.142936] bcache: register_bdev() registered backing device loop0
[   77.160954] bcache: run_cache_set() invalidating existing data
[   77.172800] bcache: register_cache() registered cache device loop1
[   77.172886] bcache: register_bcache() error /dev/loop0: device already 
registered (emitting change event)

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-25 Thread Mauricio Faria de Oliveira
Tested with bionic-proposed (problem exists)
---

# uname -rv
4.15.0-56-generic #62-Ubuntu SMP Wed Jul 24 20:18:55 UTC 2019

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[   39.096888] bcache: register_bdev() registered backing device loop0/null 2>&1
[   39.109511] bcache: run_cache_set() invalidating existing data
[   39.121256] bcache: register_cache() registered cache device loop1
[   43.083569] WARNING: CPU: 3 PID: 1207 at 
/build/linux-dHA1gi/linux-4.15.0/drivers/md/bcache/writeback.c:624 
bch_cached_dev_writeback_sta$
t+0x13f/0x1b0 [bcache]
[   43.092279] Modules linked in: bcache isofs nls_iso8859_1 kvm_intel kvm 
irqbypass input_leds joydev serio_raw sch_fq_codel ib_iser rdma_$
m iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi 
ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 as$
nc_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c 
raid1 raid0 multipath linear psmouse virtio_blk virtio_net f$
oppy
[   43.107715] CPU: 3 PID: 1207 Comm: setup-bcache-wb Not tainted 
4.15.0-56-generic #62-Ubuntu
[   43.08] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.10.2-1ubuntu1 04/01/2014
[   43.114797] RIP: 0010:bch_cached_dev_writeback_start+0x13f/0x1b0 [bcache]
[   43.117589] RSP: 0018:bcb4c13a3d28 EFLAGS: 00010283
[   43.119762] RAX: 9e8171f74080 RBX: 9e817261 RCX: 
[   43.122664] RDX:  RSI: 9e817fda70a0 RDI: 9e8177003800
[   43.125572] RBP: bcb4c13a3d30 R08: 000270a0 R09: 826afc1d
[   43.128590] R10:  R11: 0224 R12: 9e8172610010
[   43.131574] R13: 9e817261 R14: 9e817206 R15: 9e8172610ac8
[   43.134538] FS:  7f2bb42dc540() GS:9e817fd8() 
knlGS:
[   43.137983] CS:  0010 DS:  ES:  CR0: 80050033
[   43.140430] CR2: 5608572738f0 CR3: 00023502 CR4: 06e0
[   43.143389] Call Trace:
[   43.144575]  bch_cached_dev_attach+0x335/0x4f0 [bcache]
[   43.146835]  __cached_dev_store+0x749/0x7e0 [bcache]
[   43.148950]  ? __cached_dev_store+0x749/0x7e0 [bcache]
[   43.151144]  bch_cached_dev_store+0x39/0xc0 [bcache]
[   43.153266]  sysfs_kf_write+0x3c/0x50
[   43.154892]  kernfs_fop_write+0x125/0x1a0
[   43.156682]  __vfs_write+0x1b/0x40
[   43.158211]  vfs_write+0xb1/0x1a0
[   43.159710]  SyS_write+0x55/0xc0
[   43.161167]  do_syscall_64+0x73/0x130
[   43.162772]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[   43.164891] RIP: 0033:0x7f2bb3ddc154
[   43.166471] RSP: 002b:7fffaa0a1628 EFLAGS: 0246 ORIG_RAX: 
0001
[   43.169675] RAX: ffda RBX: 5608572717f0 RCX: 7f2bb3ddc154
[   43.172573] RDX: 0025 RSI: 5608572717f0 RDI: 0001
[   43.175461] RBP: 0025 R08: f000 R09: 56085727394d
[   43.178356] R10: 01b6 R11: 0246 R12: 0001
[   43.180809] R13: 0025 R14: 7fff R15: 7fffaa0a2f39
[   43.182978] Code: 0a 00 00 0f 88 85 00 00 00 75 18 48 8b 35 22 8f 4d c3 48 
8d 93 a0 0a 00 00 bf 00 20 00 00 e8 49 16 f2 c1 8b 83 80 0b 00
 00 eb a1 <0f> 0b e9 5c ff ff ff b8 f4 ff ff ff eb 93 49 8d 8c 24 88 0a 00
[   43.188541] ---[ end trace 6c8b3c91f79be271 ]---
[   43.191546] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on set 
0bd9f71d-b21f-4b5b-b4e0-dbb4e1126138


# reboot
# # comment last line in script.

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
#
[   62.048472] bcache: register_bdev() registered backing device loop0
[   62.081965] bcache: run_cache_set() invalidating existing data
[   62.101912] bcache: register_cache() registered cache device loop1
(wait a few seconds)
[   70.108124] BUG: unable to handle kernel NULL pointer dereference at 
0340
[   70.112057] IP: update_writeback_rate+0x36/0x2d0 [bcache]
[   70.114648] PGD 0 P4D 0 
[   70.116007] Oops:  [#1] SMP PTI
[   70.117768] Modules linked in: bcache isofs nls_iso8859_1 kvm_intel kvm 
irqbypass joydev input_leds serio_raw sch_fq_codel ib_iser rdma_cm iw_cm ib_cm 
ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi 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_blk virtio_net fl
oppy
[   70.128731] CPU: 3 PID: 52 Comm: kworker/3:1 Not tainted 4.15.0-56-generic 
#62-Ubuntu
[   70.131046] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.10.2-1ubuntu1 04/01/2014
[   70.133671] Workqueue: events update_writeback_rate [bcache]
[   70.135369] RIP: 0010:update_writeback_rate+0x36/0x2d0 [bcache]
[   70.137113] RSP: 0018:b88440e17e48 EFLAGS: 00010202
[   70.138792] RAX: 0018 RBX: 9c50b2650b08 RCX: 9c50bfda2160
[   70.140988] RDX: 9c50bfda2160 RSI: 00c0 RDI: 9c50b2650b08
[   70.143194] RBP: 

[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-25 Thread Mauricio Faria de Oliveira
This is the warning trigger line:

int bch_cached_dev_writeback_start(struct cached_dev *dc)
...
WARN_ON(test_and_set_bit(BCACHE_DEV_WB_RUNNING, >disk.flags));
...

This commit fixes this problem:

commit 1f0ffa67349c56ea54c03ccfd1e073c990e7411e
Author: Coly Li 
Date:   Mon Jun 10 06:13:35 2019 +0800

bcache: only set BCACHE_DEV_WB_RUNNING when cached device
attached


It is included in linux 5.2, so for now only Ubuntu Eoan has the fix;
I could reproduce the problem with Ubuntu Disco (5.0-based) kernel.

The problem can Oops the kernel (worse error) if the cache is not
attached soon (reproduced below).

I'll provide a test kernel with the fix soon.


Steps to reproduce:
--

With attach (last line in script):

$ sudo ./setup-bcache-wb_percent-before-attach.sh
...
[   36.130659] WARNING: CPU: 2 PID: 1288 at 
drivers/md/bcache/writeback.c:837 bch_cached_dev_writeback_start+0x156/0x164 
[bcache]
...
[   36.155742] RIP: 0010:bch_cached_dev_writeback_start+0x156/0x164 [bcache]
...
[   36.182455] Call Trace:
[   36.183387]  bch_cached_dev_attach+0x356/0x480 [bcache]
[   36.185104]  ? bch_keybuf_init+0x70/0x70 [bcache]
[   36.186653]  __cached_dev_store+0x59f/0x8b0 [bcache]
[   36.188274]  bch_cached_dev_store+0x39/0xc0 [bcache]
[   36.189887]  sysfs_kf_write+0x3b/0x40
[   36.191142]  kernfs_fop_write+0x12e/0x1b0
[   36.192502]  __vfs_write+0x1b/0x40
[   36.193686]  vfs_write+0xab/0x1b0
[   36.194842]  ksys_write+0x5c/0xd0
[   36.196026]  __x64_sys_write+0x1a/0x20
[   36.197296]  do_syscall_64+0x5a/0x110
[   36.198532]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   36.200158] RIP: 0033:0x7f69a1d09154
...
[   36.222967] ---[ end trace ec65e906cd03afa6 ]---
[   36.225017] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on 
set 57322d7a-1421-4dfc-a8cb-9c7b4e60c50a

Without attach (last line in script):
in a few seconds:

$ sudo ./setup-bcache-wb_percent-before-attach.sh
...
[   30.623677] BUG: unable to handle kernel NULL pointer dereference at 
0340
[   30.627527] #PF error: [normal kernel read fault]
[   30.629825] PGD 0 P4D 0 
[   30.631194] Oops:  [#1] SMP PTI
...
[   30.638818] Workqueue: events update_writeback_rate [bcache]
[   30.640543] RIP: 0010:update_writeback_rate+0x36/0x330 [bcache]
...
[   30.668496] Call Trace:
[   30.670003]  ? __schedule+0x2d8/0x840
[   30.671998]  process_one_work+0x20f/0x410
[   30.674163]  worker_thread+0x34/0x400
[   30.676160]  kthread+0x120/0x140
[   30.678014]  ? process_one_work+0x410/0x410
[   30.680238]  ? __kthread_parkme+0x70/0x70
[   30.682411]  ret_from_fork+0x35/0x40
...
[   30.704646] ---[ end trace 1bbc1b34c704f1c5 ]---
[   30.707086] RIP: 0010:update_writeback_rate+0x36/0x330 [bcache]

Test script:

$ cat setup-bcache-wb_percent-before-attach.sh
#!/bin/sh

#set -ex

dmesg -C
echo 9 > /proc/sys/kernel/printk

FILE_BACKING=/backing.img
FILE_CACHING=/caching.img

dd if=/dev/zero of=$FILE_BACKING bs=1G seek=1 count=0
dd if=/dev/zero of=$FILE_CACHING bs=1G seek=1 count=0

dd if=/dev/zero of=$FILE_BACKING bs=1M count=1 conv=notrunc
dd if=/dev/zero of=$FILE_CACHING bs=1M count=1 conv=notrunc

LOOP_BACKING=$(losetup -f --show $FILE_BACKING)
LOOP_CACHING=$(losetup -f --show $FILE_CACHING)

make-bcache -B $LOOP_BACKING
make-bcache -C $LOOP_CACHING
sleep 3

CSET_UUID=$(bcache-super-show $LOOP_CACHING | awk '/cset\.uuid/ { print
$2 }')

# Change writeback_percent before attaching
echo 11 > /sys/block/$(basename $LOOP_BACKING)/bcache/writeback_percent
sleep 1

# Comment this line to Oops in a few seconds
echo $CSET_UUID > /sys/block/$(basename $LOOP_BACKING)/bcache/attach

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-25 Thread Mauricio Faria de Oliveira
For reference, this is the Warning in the CurrentDmesg.txt file.

[   71.925684] WARNING: CPU: 8 PID: 2977 at 
/build/linux-jmOa1Y/linux-4.15.0/drivers/md/bcache/writeback.c:603 
bch_cached_dev_writeback_start+0x13f/0x1af [bcache]
[   71.925686] Modules linked in: ebtable_filter ebtables ip6table_filter 
ip6_tables devlink iptable_filter nls_utf8 cifs ccm fscache bridge stp llc 
bonding nls_iso8859_1 intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp 
kvm_intel kvm irqbypass ttm drm_kms_helper crct10dif_pclmul crc32_pclmul 
ghash_clmulni_intel pcbc drm fb_sys_fops syscopyarea sysfillrect sysimgblt 
aesni_intel mxm_wmi aes_x86_64 crypto_simd glue_helper uvcvideo cryptd 
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel 
snd_hda_codec videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core 
snd_hda_core videodev media intel_cstate snd_hwdep snd_pcm snd_timer snd 
intel_rapl_perf input_leds soundcore shpchp serio_raw ioatdma mei_me lpc_ich 
mei mac_hid wmi sch_fq_codel vhost_net vhost tap coretemp
[   71.925727]  lp parport ip_tables x_tables autofs4 raid10 raid456 
async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq 
libcrc32c raid0 multipath linear bcache raid1 hid_generic usbhid hid igb 
i2c_algo_bit dca firewire_ohci isci ahci ptp firewire_core libahci crc_itu_t 
libsas pps_core nvme scsi_transport_sas nvme_core
[   71.925751] CPU: 8 PID: 2977 Comm: bash Not tainted 4.15.0-54-generic 
#58-Ubuntu
[   71.925752] Hardware name: Supermicro X9DAi/X9DAi, BIOS 3.2 05/09/2015
[   71.925759] RIP: 0010:bch_cached_dev_writeback_start+0x13f/0x1af [bcache]
[   71.925760] RSP: 0018:a784c96abd08 EFLAGS: 00010287
[   71.925761] RAX: 967af8bfdb00 RBX: 967af366 RCX: 
[   71.925762] RDX:  RSI: 967aff2a70a0 RDI: 966aff407780
[   71.925763] RBP: a784c96abd10 R08: 000270a0 R09: aecaf22d
[   71.925764] R10:  R11: 024b R12: 967af3660010
[   71.925765] R13: 967af366 R14: 967af432 R15: 967af3660ac8
[   71.925767] FS:  7f7759f51740() GS:967aff28() 
knlGS:
[   71.925768] CS:  0010 DS:  ES:  CR0: 80050033
[   71.925770] CR2: 7fff24052e08 CR3: 001ff4410001 CR4: 000626e0
[   71.925771] Call Trace:
[   71.925781]  bch_cached_dev_attach+0x34b/0x510 [bcache]
[   71.925787]  ? kernfs_fop_write+0xcb/0x1a0
[   71.925793]  __cached_dev_store+0x5c1/0x6d0 [bcache]
[   71.925798]  ? __cached_dev_store+0x5c1/0x6d0 [bcache]
[   71.925804]  bch_cached_dev_store+0x39/0xc0 [bcache]
[   71.925806]  sysfs_kf_write+0x3c/0x50
[   71.925808]  kernfs_fop_write+0x125/0x1a0
[   71.925811]  __vfs_write+0x1b/0x40
[   71.925813]  vfs_write+0xb1/0x1a0
[   71.925814]  SyS_write+0x55/0xc0
[   71.925819]  do_syscall_64+0x73/0x130
[   71.925825]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[   71.925826] RIP: 0033:0x7f775962b154
[   71.925827] RSP: 002b:7fff76f6a788 EFLAGS: 0246 ORIG_RAX: 
0001
[   71.925829] RAX: ffda RBX: 0025 RCX: 7f775962b154
[   71.925830] RDX: 0025 RSI: 55c6907e0140 RDI: 0001
[   71.925831] RBP: 55c6907e0140 R08: 000a R09: 0024
[   71.925832] R10: 000a R11: 0246 R12: 7f7759907760
[   71.925833] R13: 0025 R14: 7f77599032a0 R15: 7f7759902760
[   71.925834] Code: 0a 00 00 0f 88 84 00 00 00 75 18 48 8b 35 c2 13 e2 ef 48 
8d 93 a0 0a 00 00 bf 00 20 00 00 e8 f9 a6 86 ee 8b 83 80 0b 00 00 eb a1 <0f> 0b 
e9 5c ff ff ff b8 f4 ff ff ff eb 93 49 8d 8c 24 88 0a 00 
[   71.925865] ---[ end trace b657ee904e9a8497 ]---
[   71.925880] bcache: bch_cached_dev_attach() Caching md1 as bcache0 on set 
eb92c552-bd01-458a-994e-7f8760fd6342

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Title:
  bcache kernel warning when attaching device

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[Bug 1837788] Re: bcache kernel warning when attaching device

2019-07-25 Thread Mauricio Faria de Oliveira
** Changed in: linux (Ubuntu)
 Assignee: (unassigned) => Mauricio Faria de Oliveira (mfo)

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Title:
  bcache kernel warning when attaching device

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