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[Kamal Mostafa <kamal@xxxxxxxxxxxxx>]

Only affects Ubuntu Trusty.

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

** Changed in: linux (Ubuntu Trusty)
       Status: New => In Progress

** Changed in: linux (Ubuntu Trusty)
     Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)

** Changed in: linux (Ubuntu Trusty)
   Importance: Undecided => High

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

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https://bugs.launchpad.net/bugs/1551327

Title:
  [regression] task bcache_register blocked

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  In Progress

Bug description:
  On boot with bcache-tools installed and bcache configured.

  OK: 3.13.0-78.122
  BAD: 3.13.0-80.124
  BAD: 3.13.11-031311ckt35.201602161330

  [  492.780491] INFO: task bcache-register:1677 blocked for more than 120 seconds.
  [  492.780648]       Not tainted 3.13.11-031311ckt35-generic #201602161330
  [  492.780782] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  492.780943] bcache-register D 0000000000000000     0  1677      1 0x00000004
  [  492.780951]  ffff8800882a7d70 0000000000000286 ffff880002cb3000 0000000000013180
  [  492.780960]  ffff8800882a7fd8 0000000000013180 ffff880002cb3000 ffffffffa00cd840
  [  492.780970]  ffffffffa00cd844 ffff880002cb3000 00000000ffffffff ffffffffa00cd848
  [  492.780980] Call Trace:
  [  492.780994]  [<ffffffff8171a1f9>] schedule_preempt_disabled+0x29/0x70
  [  492.781003]  [<ffffffff8171c065>] __mutex_lock_slowpath+0x135/0x1b0
  [  492.781015]  [<ffffffff8171c0ff>] mutex_lock+0x1f/0x2f
  [  492.781040]  [<ffffffffa00bb912>] register_bcache+0x52/0x1350 [bcache]
  [  492.781048]  [<ffffffff81721a64>] ? __do_page_fault+0x204/0x560
  [  492.781058]  [<ffffffff8117f80e>] ? do_mmap_pgoff+0x34e/0x3d0
  [  492.781067]  [<ffffffff8135a9ef>] kobj_attr_store+0xf/0x20
  [  492.781075]  [<ffffffff81231f18>] sysfs_write_file+0x128/0x1c0
  [  492.781084]  [<ffffffff811bbb54>] vfs_write+0xb4/0x1f0
  [  492.781093]  [<ffffffff811bc589>] SyS_write+0x49/0xa0
  [  492.781102]  [<ffffffff8172641d>] system_call_fastpath+0x1a/0x1f
  [  612.779211] INFO: task bcache_writebac:532 blocked for more than 120 seconds.
  [  612.779309]       Not tainted 3.13.11-031311ckt35-generic #201602161330
  [  612.779384] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  612.779495] bcache_writebac D 0000000000000000     0   532      2 0x00000000
  [  612.779508]  ffff8800865d9eb8 0000000000000246 ffff880086608000 0000000000013180
  [  612.779521]  ffff8800865d9fd8 0000000000013180 ffff880086608000 ffff880002899440
  [  612.779532]  ffff880086790000 ffffffffa00b2840 0000000000000000 0000000000000000
  [  612.779543] Call Trace:
  [  612.779594]  [<ffffffffa00b2840>] ? read_dirty+0x400/0x400 [bcache]
  [  612.779611]  [<ffffffff81719ce9>] schedule+0x29/0x70
  [  612.779624]  [<ffffffff8108a134>] kthread+0xa4/0xe0
  [  612.779633]  [<ffffffff8108a090>] ? kthread_create_on_node+0x180/0x180
  [  612.779644]  [<ffffffff81726368>] ret_from_fork+0x58/0x90
  [  612.779653]  [<ffffffff8108a090>] ? kthread_create_on_node+0x180/0x180

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