Public bug reported:
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
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1551327
Title:
[regression] task bcache_register blocked
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