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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1411734

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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

Title:
  bcache crash

Status in linux package in Ubuntu:
  Incomplete

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.

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