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[Bug 1486894] Re: btrfs scrub hangs

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: frankster <1486894@xxxxxxxxxxxxxxxxxx>
Date: Thu, 20 Aug 2015 11:09:40 -0000
Reply-to: Bug 1486894 <1486894@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
btrfs-tools  3.14.1-1

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https://bugs.launchpad.net/bugs/1486894

Title:
  btrfs scrub hangs

Status in linux-lts-vivid package in Ubuntu:
  New

Bug description:
  I have a btrfs filesystem comprised of a few discs (metadata raid1,
  data unduplicated). I run btrfs scrub and some checksum errors are
  reported, then the scrub hangs and there are some stack traces in
  syslog. This occurs with kernel 3.19.0-26-generic and is a regression
  from 3.13.0-62-generic, where the scrub reports checksum errors but
  completes successfully.

  
  Aug 19 19:36:45 mythtv kernel: [ 1560.092069] INFO: task btrfs:17303 blocked for more than 120 seconds.
  Aug 19 19:36:45 mythtv kernel: [ 1560.092075]       Tainted: P           OE  3.19.0-26-generic #28~14.04.1-Ubuntu
  Aug 19 19:36:45 mythtv kernel: [ 1560.092076] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Aug 19 19:36:45 mythtv kernel: [ 1560.092079] btrfs           D ffff8800706bb828     0 17303      1 0x00000000
  Aug 19 19:36:45 mythtv kernel: [ 1560.092084]  ffff8800706bb828 ffff880070526bf0 0000000000013e80 ffff8800706bbfd8
  Aug 19 19:36:45 mythtv kernel: [ 1560.092087]  0000000000013e80 ffff88006faa3110 ffff880070526bf0 ffff8800706bb838
  Aug 19 19:36:45 mythtv kernel: [ 1560.092091]  ffff8801d2742000 ffff8801d2742218 ffff8801d2742220 ffff880186bf0b00
  Aug 19 19:36:45 mythtv kernel: [ 1560.092094] Call Trace:
  Aug 19 19:36:45 mythtv kernel: [ 1560.092103]  [<ffffffff817b24f9>] schedule+0x29/0x70
  Aug 19 19:36:45 mythtv kernel: [ 1560.092139]  [<ffffffffc058dfc5>] scrub_add_page_to_rd_bio+0x1c5/0x2b0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092144]  [<ffffffff810b4e10>] ? prepare_to_wait_event+0x110/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092164]  [<ffffffffc058f76c>] scrub_pages+0x1ec/0x290 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092183]  [<ffffffffc0591498>] scrub_stripe+0xa48/0x1040 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092204]  [<ffffffffc0591bab>] scrub_chunk.isra.19+0x11b/0x140 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092224]  [<ffffffffc054e009>] ? btrfs_get_token_64+0x59/0xe0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092244]  [<ffffffffc0591e2a>] scrub_enumerate_chunks+0x25a/0x4b0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092246]  [<ffffffff810b4e00>] ? prepare_to_wait_event+0x100/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092259]  [<ffffffffc05937a8>] btrfs_scrub_dev+0x1a8/0x550 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092263]  [<ffffffff8120cfb5>] ? __mnt_want_write_file+0x25/0x30
  Aug 19 19:36:45 mythtv kernel: [ 1560.092276]  [<ffffffffc056ddaf>] btrfs_ioctl+0x138f/0x2ac0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092279]  [<ffffffff811cf7d5>] ? kmem_cache_alloc_node+0x115/0x250
  Aug 19 19:36:45 mythtv kernel: [ 1560.092282]  [<ffffffff8137beb7>] ? create_task_io_context+0x27/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092285]  [<ffffffff811ffbf8>] do_vfs_ioctl+0x2f8/0x510
  Aug 19 19:36:45 mythtv kernel: [ 1560.092288]  [<ffffffff8138a324>] ? set_task_ioprio+0x94/0xb0
  Aug 19 19:36:45 mythtv kernel: [ 1560.092290]  [<ffffffff811ffe91>] SyS_ioctl+0x81/0xa0
  Aug 19 19:36:45 mythtv kernel: [ 1560.092292]  [<ffffffff817b688d>] system_call_fastpath+0x16/0x1b
  Aug 19 19:36:45 mythtv kernel: [ 1560.092295] INFO: task btrfs:17304 blocked for more than 120 seconds.
  Aug 19 19:36:45 mythtv kernel: [ 1560.092296]       Tainted: P           OE  3.19.0-26-generic #28~14.04.1-Ubuntu
  Aug 19 19:36:45 mythtv kernel: [ 1560.092297] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Aug 19 19:36:45 mythtv kernel: [ 1560.092298] btrfs           D ffff8800706ab8b8     0 17304      1 0x00000000
  Aug 19 19:36:45 mythtv kernel: [ 1560.092300]  ffff8800706ab8b8 ffff8800705275c0 0000000000013e80 ffff8800706abfd8
  Aug 19 19:36:45 mythtv kernel: [ 1560.092303]  0000000000013e80 ffff88006faa3110 ffff8800705275c0 ffff8800706ab8c8
  Aug 19 19:36:45 mythtv kernel: [ 1560.092305]  ffff8800705821e0 ffff880070582218 ffff8800706ab8f8 ffff8801d2740800
  Aug 19 19:36:45 mythtv kernel: [ 1560.092307] Call Trace:
  Aug 19 19:36:45 mythtv kernel: [ 1560.092309]  [<ffffffff817b24f9>] schedule+0x29/0x70
  Aug 19 19:36:45 mythtv kernel: [ 1560.092322]  [<ffffffffc059560d>] btrfs_reada_wait+0x6d/0xb0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092324]  [<ffffffff810b4e10>] ? prepare_to_wait_event+0x110/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092337]  [<ffffffffc0590cb7>] scrub_stripe+0x267/0x1040 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092346]  [<ffffffffc050ed2d>] ? generic_bin_search.constprop.35+0x8d/0x1b0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092359]  [<ffffffffc0591bab>] scrub_chunk.isra.19+0x11b/0x140 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092371]  [<ffffffffc054e009>] ? btrfs_get_token_64+0x59/0xe0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092384]  [<ffffffffc0591e2a>] scrub_enumerate_chunks+0x25a/0x4b0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092386]  [<ffffffff810b4e00>] ? prepare_to_wait_event+0x100/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092399]  [<ffffffffc05937a8>] btrfs_scrub_dev+0x1a8/0x550 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092413]  [<ffffffff8120cfb5>] ? __mnt_want_write_file+0x25/0x30
  Aug 19 19:36:45 mythtv kernel: [ 1560.092425]  [<ffffffffc056ddaf>] btrfs_ioctl+0x138f/0x2ac0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092428]  [<ffffffff811cf7d5>] ? kmem_cache_alloc_node+0x115/0x250
  Aug 19 19:36:45 mythtv kernel: [ 1560.092430]  [<ffffffff8137beb7>] ? create_task_io_context+0x27/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092432]  [<ffffffff811ffbf8>] do_vfs_ioctl+0x2f8/0x510
  Aug 19 19:36:45 mythtv kernel: [ 1560.092434]  [<ffffffff8138a324>] ? set_task_ioprio+0x94/0xb0
  Aug 19 19:36:45 mythtv kernel: [ 1560.092436]  [<ffffffff811ffe91>] SyS_ioctl+0x81/0xa0
  Aug 19 19:36:45 mythtv kernel: [ 1560.092438]  [<ffffffff817b688d>] system_call_fastpath+0x16/0x1b
  Aug 19 19:36:45 mythtv kernel: [ 1560.092440] INFO: task btrfs:17305 blocked for more than 120 seconds.
  Aug 19 19:36:45 mythtv kernel: [ 1560.092442]       Tainted: P           OE  3.19.0-26-generic #28~14.04.1-Ubuntu
  Aug 19 19:36:45 mythtv kernel: [ 1560.092443] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Aug 19 19:36:45 mythtv kernel: [ 1560.092444] btrfs           D ffff8800706af8b8     0 17305      1 0x00000000
  Aug 19 19:36:45 mythtv kernel: [ 1560.092446]  ffff8800706af8b8 ffff8802161c1d70 0000000000013e80 ffff8800706affd8
  Aug 19 19:36:45 mythtv kernel: [ 1560.092448]  0000000000013e80 ffff880188a64e80 ffff8802161c1d70 ffff8800706af8c8
  Aug 19 19:36:45 mythtv kernel: [ 1560.092450]  ffff88007058fd20 ffff88007058fd58 ffff8800706af8f8 ffff8801d2742c00
  Aug 19 19:36:45 mythtv kernel: [ 1560.092452] Call Trace:
  Aug 19 19:36:45 mythtv kernel: [ 1560.092455]  [<ffffffff817b24f9>] schedule+0x29/0x70
  Aug 19 19:36:45 mythtv kernel: [ 1560.092467]  [<ffffffffc059560d>] btrfs_reada_wait+0x6d/0xb0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092469]  [<ffffffff810b4e10>] ? prepare_to_wait_event+0x110/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092482]  [<ffffffffc0590cc8>] scrub_stripe+0x278/0x1040 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092484]  [<ffffffff810b4e50>] ? autoremove_wake_function+0x40/0x40
  Aug 19 19:36:45 mythtv kernel: [ 1560.092498]  [<ffffffffc0558e2a>] ? read_extent_buffer_pages+0x2ca/0x300 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092507]  [<ffffffffc050ed2d>] ? generic_bin_search.constprop.35+0x8d/0x1b0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092520]  [<ffffffffc0591bab>] scrub_chunk.isra.19+0x11b/0x140 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092532]  [<ffffffffc054e009>] ? btrfs_get_token_64+0x59/0xe0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092545]  [<ffffffffc0591e2a>] scrub_enumerate_chunks+0x25a/0x4b0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092547]  [<ffffffff810b4e00>] ? prepare_to_wait_event+0x100/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092560]  [<ffffffffc05937a8>] btrfs_scrub_dev+0x1a8/0x550 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092562]  [<ffffffff8120cfb5>] ? __mnt_want_write_file+0x25/0x30
  Aug 19 19:36:45 mythtv kernel: [ 1560.092574]  [<ffffffffc056ddaf>] btrfs_ioctl+0x138f/0x2ac0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092577]  [<ffffffff811cf7d5>] ? kmem_cache_alloc_node+0x115/0x250
  Aug 19 19:36:45 mythtv kernel: [ 1560.092579]  [<ffffffff8137beb7>] ? create_task_io_context+0x27/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092581]  [<ffffffff811ffbf8>] do_vfs_ioctl+0x2f8/0x510
  Aug 19 19:36:45 mythtv kernel: [ 1560.092583]  [<ffffffff8138a324>] ? set_task_ioprio+0x94/0xb0
  Aug 19 19:36:45 mythtv kernel: [ 1560.092585]  [<ffffffff811ffe91>] SyS_ioctl+0x81/0xa0
  Aug 19 19:36:45 mythtv kernel: [ 1560.092587]  [<ffffffff817b688d>] system_call_fastpath+0x16/0x1b
  Aug 19 19:36:45 mythtv kernel: [ 1560.092589] INFO: task btrfs:17306 blocked for more than 120 seconds.
  Aug 19 19:36:45 mythtv kernel: [ 1560.092591]       Tainted: P           OE  3.19.0-26-generic #28~14.04.1-Ubuntu
  Aug 19 19:36:45 mythtv kernel: [ 1560.092592] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Aug 19 19:36:45 mythtv kernel: [ 1560.092593] btrfs           D ffff8800706b38b8     0 17306      1 0x00000000
  Aug 19 19:36:45 mythtv kernel: [ 1560.092595]  ffff8800706b38b8 ffff8801da956bf0 0000000000013e80 ffff8800706b3fd8
  Aug 19 19:36:45 mythtv kernel: [ 1560.092597]  0000000000013e80 ffff88006faa3110 ffff8801da956bf0 ffff8800706b38c8
  Aug 19 19:36:45 mythtv kernel: [ 1560.092599]  ffff880070582480 ffff8800705824b8 ffff8800706b38f8 ffff8801d2741c00
  Aug 19 19:36:45 mythtv kernel: [ 1560.092601] Call Trace:
  Aug 19 19:36:45 mythtv kernel: [ 1560.092603]  [<ffffffff817b24f9>] schedule+0x29/0x70
  Aug 19 19:36:45 mythtv kernel: [ 1560.092616]  [<ffffffffc059560d>] btrfs_reada_wait+0x6d/0xb0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092618]  [<ffffffff810b4e10>] ? prepare_to_wait_event+0x110/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092630]  [<ffffffffc0590cb7>] scrub_stripe+0x267/0x1040 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092640]  [<ffffffffc050ed2d>] ? generic_bin_search.constprop.35+0x8d/0x1b0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092653]  [<ffffffffc0591bab>] scrub_chunk.isra.19+0x11b/0x140 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092665]  [<ffffffffc054e009>] ? btrfs_get_token_64+0x59/0xe0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092678]  [<ffffffffc0591e2a>] scrub_enumerate_chunks+0x25a/0x4b0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092680]  [<ffffffff810b4e00>] ? prepare_to_wait_event+0x100/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092693]  [<ffffffffc05937a8>] btrfs_scrub_dev+0x1a8/0x550 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092695]  [<ffffffff8120cfb5>] ? __mnt_want_write_file+0x25/0x30
  Aug 19 19:36:45 mythtv kernel: [ 1560.092707]  [<ffffffffc056ddaf>] btrfs_ioctl+0x138f/0x2ac0 [btrfs]
  Aug 19 19:36:45 mythtv kernel: [ 1560.092710]  [<ffffffff811cf7d5>] ? kmem_cache_alloc_node+0x115/0x250
  Aug 19 19:36:45 mythtv kernel: [ 1560.092712]  [<ffffffff8137beb7>] ? create_task_io_context+0x27/0x110
  Aug 19 19:36:45 mythtv kernel: [ 1560.092714]  [<ffffffff811ffbf8>] do_vfs_ioctl+0x2f8/0x510
  Aug 19 19:36:45 mythtv kernel: [ 1560.092716]  [<ffffffff8138a324>] ? set_task_ioprio+0x94/0xb0
  Aug 19 19:36:45 mythtv kernel: [ 1560.092718]  [<ffffffff811ffe91>] SyS_ioctl+0x81/0xa0
  Aug 19 19:36:45 mythtv kernel: [ 1560.092720]  [<ffffffff817b688d>] system_call_fastpath+0x16/0x1b

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-extra-3.19.0-26-generic 3.19.0-26.28~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-26.28~14.04.1-generic 3.19.8-ckt4
  Uname: Linux 3.19.0-26-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  Date: Thu Aug 20 09:31:52 2015
  InstallationDate: Installed on 2012-03-26 (1241 days ago)
  InstallationMedia: Mythbuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  SourcePackage: linux-lts-vivid
  UpgradeStatus: Upgraded to trusty on 2014-07-20 (395 days ago)

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References

[Bug 1486894] [NEW] btrfs scrub hangs
From: frankster, 2015-08-20