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[Frank Banul <frank.banul@xxxxxxx>]

This issue happened on the 3.13.0-43 (original install) kernel as well
as on the current 3.13.0-44. I have not previously tested other kernel
versions.

I have installed kernel 3.19.0-031900rc4-generic x86_64. The problem
does not manifest immediately on 3.13.0-44 or 3.19. I will test and
report the results back.

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https://bugs.launchpad.net/bugs/1411734

Title:
  bcache crash

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Using bcache with a 512GB SSD as cache, 4TB HDD as backing, doing a
  backup of the bcache device sometimes results in a kernel crash. Below
  is an OCR of the crash log.

  lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  Linux goliad 3.13.0-44-generic #73-Ubuntu SMP Tue Dec 16 00:22:43 UTC
  2014 x86_64 x86_64 x86_64 GNU/Linux

  I have a picture of the screen as well if needed.

  [127032.260022] R13: 0000000000000002 R14: ffff8800d5e27ff0 R15: ffff8800d5e28000
  [127032.260952] FS: 0000000000000000(0000) GS:ffff88021fc80000(0000) knlGS:0000000000000000
  [127032.261880] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [127032.262813] CR2: 0000000000000028 CR3: 000000021ec0e000 CR4: 00000000000007e0
  [127032.263755] Stack:
  [127032.264683] ffff8800d724f830 ffffffff81084f51 ffffBB00d5e28000 ffff8800d724f890
  [127032.265629] ffffffff81724f39 ffff8800d5e28000 ffff8800d724ffd8 0000000000013480
  [127032.266577] 0000000000013480 ffff8800d5e28000 ffffBB00d5e28650 ffff8800d5e27ff0
  [127032.267523] Call Trace:
  [127032.268453] [<ffffffff81084f51>] wq_worker_sleeping+0x11/0x90
  [127032.269386] [<ffffffff81724f39>] __schedule+0x589/0x7d0
  [127032.270323] [<ffffffff817251a9>] schedule+0x29/0x70
  [127032.271260] [<ffffffff8106a15f>] do_exit+0x6df/0xa50 
  [127032.272194] [<ffffffffB172a329>] oops_end+0xa9/0x150
  [127032.273115] [<ffffffff8171996d>] no_context+0x27e/0x28b
  [127032.274038] [<ffffffff817199ed>] __bad_area_nose,aphore+0x73/0x1ca
  [127032.274960] [<ffffffff81719b57>] bad_area_nosemaphore+0x13/0x15
  [127032.275878] [<ffffffff8172ccf7>] __do_page_fault+0xa7/0x560
  [127032.276791] [<ffffffff81197793>] ? alloc_pages_current+0xa3/0x160
  [127032.277708] [<ffffffff81153Bfe>] ? __get_free_pages+0xe/0x50
  [127032.278630] [<ffffffff8117083e>] ? kmalloc_order_trace+0x2e/0xa0 
  [127032.279553] [<ffffffff8172d1ca>] do_page_fault+0x1a/0x70
  [127032.280474] [<ffffffff811a2941>] ? __kmalloc+0x211/0x230
  [127032.281390] [<ffffffff81729628>] page_fault+0xZ8/0x30
  [127032.282275] [<ffffffffa009a976>] ? bch_htree_node_read+0x176/0x550 [bcache1
  [127032.283108] [<ffffffffa009bf45>] bch_btree_node_get+0x165/0x290 [bcache]
  [127032.283933] [<ffffffffa009c108>] bch_btree_map_nodes_recurse+0x98/0x140 [bcache]
  [127032.284760] [<ffffffffa009eb90>] ? bch_btree_insert_check_key+0x190/0x190 [bcache]
  [127032.285593] [<ffffffff81151947>] ? mempool_free_slab+0x17/0x20
  [127032.286418] [<ffffffff81151bb9>] ? mempool_free+0x49/0x90
  [127032.287233] [<ffffffffa009f3c9>] __bch_btree_map_nodes+0x139/0x1c0 [bcache]
  [127032.288053] [<ffffffffa009eb90>] ? bch_btree_insert_check_key+0x190/0x190 [bcache]
  [127032.288873] [<ffffffff81151bb9>] ? mempool_free+0x49/0x90
  [127032.289678] [<ffffffffa009f504>] bch_btree_insert+0xb4/0x120 [bcache]
  [127032.290476] [<ffffffffa00a97ba>] bch_data_insert_keys+0x3a/0x160 [bcache]
  [127032.291258] [<ffffffff81083a52>] process_one_work+0x182/0x450
  [127032.292029] [<ffffffff81084841>] worker_thread+0x121/0x410
  [127032.292786] [<ffffffffB1e84720>] ? rescuer_thread+0x430/0x430
  [127032.293523] [<ffffffff8108b572>] kthread+0xd2/0xf0
  [127032.294246] [<ffffffff8108b4a0>] ? kthread_create_on_node+0x1c0/0x1c0 
  [127032.294961] [<ffffffff817317bc>] ret_from_fork+0x7c/0xb0
  [127032.295672] [<ffffffff8108b4a0>] ? kthread_create_on_node+0xlc0/0xlc0
  [127032.296374] Code: 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 48 8b 87 c0 03 00 00 55 48 89 e5 <48> 8b 40 d8 5d c3 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90
  [127032.298061] RIP [<ffffffff8108bc10>] kthread_data+0x10/0x20
  [127032.298853]  RSP <ffff8800d724f818>
  [127032.299630] CR2: ffffffffffffffd8

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-44-generic 3.13.0-44.73
  ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
  Uname: Linux 3.13.0-44-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/hwC0D3', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
  Date: Fri Jan 16 10:04:07 2015
  InstallationDate: Installed on 2011-08-25 (1240 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 003: ID 0557:2220 ATEN International Co., Ltd
  MachineType: Dell Inc. OptiPlex 980
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-44-generic root=UUID=63c581a7-3055-4192-88c2-af192e84130d ro quiet splash crashkernel=384M-:128M vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-12-24 (23 days ago)
  WifiSyslog:
   
  dmi.bios.date: 01/21/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0D441T
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A03
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd01/21/2011:svnDellInc.:pnOptiPlex980:pvr:rvnDellInc.:rn0D441T:rvrA03:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 980
  dmi.sys.vendor: Dell Inc.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/hwC0D3', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDmesg:
   Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
   dmesg: write failed: Broken pipe
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2011-08-25 (1240 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 003: ID 0557:2220 ATEN International Co., Ltd
  MachineType: Dell Inc. OptiPlex 980
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-44-generic root=UUID=63c581a7-3055-4192-88c2-af192e84130d ro quiet splash crashkernel=384M-:128M vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
  RfKill:
   
  Tags:  trusty
  Uname: Linux 3.13.0-44-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-12-24 (23 days ago)
  UserGroups:
   
  WifiSyslog:
   
  _MarkForUpload: True
  dmi.bios.date: 01/21/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0D441T
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A03
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd01/21/2011:svnDellInc.:pnOptiPlex980:pvr:rvnDellInc.:rn0D441T:rvrA03:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 980
  dmi.sys.vendor: Dell Inc.

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