[dm-devel] Fix "dm kcopyd: Fix bug causing workqueue stalls" causes dead lock
Guruswamy Basavaiah
guru2018 at gmail.com
Sun Sep 29 14:36:42 UTC 2019
Hello Nikos,
Thanks for pointing out the lvcreate write lock.
Guru
On Sat, 28 Sep 2019 at 01:03, Nikos Tsironis <ntsironis at arrikto.com> wrote:
>
> On 9/27/19 4:19 PM, Guruswamy Basavaiah wrote:
> > Hello,
> > We have drbd partition on top of lvm partition. when node having
> > secondary drbd partition is coming up, large amount of data will be
> > synced between primary to secondary drbd partitions.
> >
> > During this time, we see the drbd Sync(Resync) stops at some point.
> > After 120 seconds we see hung-task-timeout warnings in the logs.(see
> > at the end of this email)
> >
> > If i increase the cow_count semaphore value from 2048 to 8192 or
> > remove the below patch, drbd sync works seamlessly.
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/patch/?id=721b1d98fb517ae99ab3b757021cf81db41e67be
> >
> > I am not familiar with dm code, from hung task back traces what i
> > understand is, when thread is trying to queue work to kcopyd, holding
> > "&_origins_lock" and blocked on cow_count lock,
> > jobs from kcopyd is trying to queue work to same kcopyd and blocked on
> > "&_origins_lock" and dead lock.
> >
>
> Hello Guruswamy,
>
> I am Cc-ing the maintainers, so they can be in the loop.
>
> I examined the attached logs and I believe the following happens:
>
> 1. DRBD issues a number of writes to the snapshot origin device. These
> writes cause COW, which is performed by kcopyd.
>
> 2. At some point DRBD reaches the cow_count semaphore limit (2048) and
> blocks in down(&s->cow_count), holding a read lock on _origins_lock.
>
> 3. Someone tries to create a new snapshot. This involves taking a write
> lock on _origins_lock, which blocks because DRBD at step (2) already
> holds a read lock on it. That's the blocked lvcreate at the end of
> the trace.
>
> 4. A COW operation, issued by step (1), completes and kcopyd runs
> dm-snapshot's completion callback, which tries to take a read lock on
> _origins_lock, before signaling the cow_count semaphore. This read
> lock blocks, the semaphore is never signaled and we have the deadlock
> you experienced.
>
> At first glance this seemed strange, because DRBD at step (2) holds a
> read lock on _origins_lock, so taking another read lock should be
> possible.
>
> But, if I am not missing something, the read-write semaphore
> implementation gives priority to writers, meaning that as soon as a
> writer tries to enter the critical section, the lvcreate in our case, no
> readers will be allowed in until all writers have completed their work.
>
> That's what I believe is causing the deadlock you are experiencing.
>
> I will send a patch fixing this and I will let you now.
>
> Thanks,
> Nikos
>
> > Below is the hung task back traces.
> > Sep 24 12:08:48.974658 err CFPU-1 kernel: [ 279.991760] INFO: task
> > kworker/1:1:170 blocked for more than 120 seconds.
> > Sep 24 12:08:48.974658 err CFPU-1 kernel: [ 279.998569]
> > Tainted: P O 4.4.184-octeon-distro.git-v2.96-4-rc-wnd #1
> > Sep 24 12:08:48.974658 err CFPU-1 kernel: [ 280.006593] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > Sep 24 12:08:48.974658 info CFPU-1 kernel: [ 280.014435] kworker/1:1
> > D ffffffff80e1db78 0 170 2 0x00100000
> > Sep 24 12:08:48.974658 info CFPU-1 kernel: [ 280.014482] Workqueue:
> > kcopyd do_work [dm_mod]
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487] Stack :
> > 0000000000000000 0000000000000001 0003000300000000 80000007fde8bac8
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487]
> > 80000007fe759b00 0000000000000002 ffffffffc0285294 80000007f8d1ca00
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487]
> > ffffffffc027eda8 0000000000000001 ffffffff80b30000 0000000000000100
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487]
> > 8000000784c098c8 ffffffff80e1db78 80000007fe759b00 ffffffff80e204b8
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487]
> > 8000000788ef79c0 800000078505ba70 80000007fe759b00 00000001852b4620
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487]
> > ffffffffc0280000 80000007852b4620 80000007eebf5758 ffffffffc027edec
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487]
> > 0000000000000000 80000007852b4620 80000007835d8e80 ffffffffc027f38c
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487]
> > 8000000787ac0580 0000000000000001 80000007f8d1ca60 8000000785aeb080
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487]
> > 0000000000000000 0000000000000000 0000000000000200 ffffffffc0282488
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487]
> > 0000000000000200 80000007f8d1ca00 ffffffffc0280000 ffffffffc027db90
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014487] ...
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014558] Call Trace:
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014570]
> > [<ffffffff80e1d4a8>] __schedule+0x3c0/0xa58
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014580]
> > [<ffffffff80e1db78>] schedule+0x38/0x98
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014590]
> > [<ffffffff80e204b8>] __down_read+0xa8/0xf0
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014609]
> > [<ffffffffc027edec>] do_origin.isra.13+0x44/0x110 [dm_snapshot]
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014625]
> > [<ffffffffc027f38c>] pending_complete+0x1ac/0x378 [dm_snapshot]
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014642]
> > [<ffffffffc0282488>] persistent_commit_exception+0x140/0x218
> > [dm_snapshot]
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014659]
> > [<ffffffffc027db90>] copy_callback+0x108/0x1a0 [dm_snapshot]
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014688]
> > [<ffffffffc01eb6a4>] run_complete_job+0x8c/0x148 [dm_mod]
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014724]
> > [<ffffffffc01eaae8>] process_jobs+0xc8/0x1e0 [dm_mod]
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014759]
> > [<ffffffffc01eb1e0>] do_work+0xb8/0x110 [dm_mod]
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014783]
> > [<ffffffff808b18e0>] process_one_work+0x190/0x480
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014791]
> > [<ffffffff808b1d18>] worker_thread+0x148/0x580
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014801]
> > [<ffffffff808b813c>] kthread+0xdc/0xf8
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014811]
> > [<ffffffff8086bf28>] ret_from_kernel_thread+0x14/0x1c
> > Sep 24 12:08:48.974658 warn CFPU-1 kernel: [ 280.014817]
> > Sep 24 12:08:48.974658 err CFPU-1 kernel: [ 280.015046] INFO: task
> > drbd_r_r1:7772 blocked for more than 120 seconds.
> > Sep 24 12:08:48.974658 err CFPU-1 kernel: [ 280.021766]
> > Tainted: P O 4.4.184-octeon-distro.git-v2.96-4-rc-wnd #1
> > Sep 24 12:08:48.974658 err CFPU-1 kernel: [ 280.029781] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > Sep 24 12:08:48.982578 info CFPU-1 kernel: [ 280.037637] drbd_r_r1
> > D ffffffff80e1db78 0 7772 2 0x00100002
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648] Stack :
> > 00000000000207e8 ffffffff80b35530 8000000788e77860 8000000788e77860
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648]
> > 7fffffffffffffff 80000007f8d1cb28 8000000788e0a880 0000000000000002
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648]
> > ffffffff80e20000 80000007f9306480 00000000000207e8 ffffffff808dfe58
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648]
> > 80000007eebf5168 ffffffff80e1db78 0000000002411200 ffffffff80e208d8
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648]
> > 80000007eab5b440 ffffffff8097b25c 00000000000207a0 ffffffff808dfe58
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648]
> > 80000007f8d1ca00 ffffffff809ce014 80000007f9306000 0000000002011200
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648]
> > 7fffffffffffffff 80000007f8d1cb28 8000000788e0a880 0000000000000002
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648]
> > ffffffff80e20000 ffffffff80e1f8d8 80000007f8d1cb30 80000007f8d1cb30
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648]
> > 8000000788e0a880 00ffffff808db9e8 0000000000000000 80000007f8d1cb28
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648]
> > 80000007f9306480 ffffffffc02834d0 ffffffff808e0000 ffffffff808dfba4
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037648] ...
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037774] Call Trace:
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037797]
> > [<ffffffff80e1d4a8>] __schedule+0x3c0/0xa58
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037849]
> > [<ffffffff80e1db78>] schedule+0x38/0x98
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037865]
> > [<ffffffff80e208d8>] schedule_timeout+0x240/0x2a0
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037874]
> > [<ffffffff80e1f8d8>] __down+0x90/0xd8
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037884]
> > [<ffffffff808dfba4>] down+0x54/0x70
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037901]
> > [<ffffffffc027da48>] start_copy+0x98/0xd8 [dm_snapshot]
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037934]
> > [<ffffffffc027e7d4>] __origin_write+0x184/0x2c0 [dm_snapshot]
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.037968]
> > [<ffffffffc027ee4c>] do_origin.isra.13+0xa4/0x110 [dm_snapshot]
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.038016]
> > [<ffffffffc01dc2c0>] __map_bio+0xb0/0x258 [dm_mod]
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.038071]
> > [<ffffffffc01deb94>] __split_and_process_bio+0x274/0x488 [dm_mod]
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.038126]
> > [<ffffffffc01dee3c>] dm_make_request+0x94/0x128 [dm_mod]
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.038174]
> > [<ffffffff80b3347c>] generic_make_request+0x114/0x290
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.038238]
> > [<ffffffffc0511090>] drbd_submit_peer_request+0x258/0x618 [drbd]
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.038337]
> > [<ffffffffc05121f8>] receive_RSDataReply+0x3b8/0x770 [drbd]
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.038426]
> > [<ffffffffc0515b30>] drbd_receiver+0x210/0x420 [drbd]
> > Sep 24 12:08:48.983234 warn CFPU-1 kernel: [ 280.038526]
> > [<ffffffffc0523a3c>] drbd_thread_setup+0x74/0x1a8 [drbd]
> > Sep 24 12:08:48.985184 warn CFPU-1 kernel: [ 280.038588]
> > [<ffffffff808b813c>] kthread+0xdc/0xf8
> > Sep 24 12:08:48.985184 warn CFPU-1 kernel: [ 280.038604]
> > [<ffffffff8086bf28>] ret_from_kernel_thread+0x14/0x1c
> > Sep 24 12:08:48.985184 warn CFPU-1 kernel: [ 280.038612]
> > Sep 24 12:08:48.985184 err CFPU-1 kernel: [ 280.038629] INFO: task
> > drbd_r_r5:7910 blocked for more than 120 seconds.
> > Sep 24 12:08:48.990218 err CFPU-1 kernel: [ 280.045351]
> > Tainted: P O 4.4.184-octeon-distro.git-v2.96-4-rc-wnd #1
> > Sep 24 12:08:48.998215 err CFPU-1 kernel: [ 280.053372] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > Sep 24 12:08:49.006141 info CFPU-1 kernel: [ 280.061248] drbd_r_r5
> > D ffffffff80e1db78 0 7910 2 0x00100002
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257] Stack :
> > 0000000000000001 ffffffff80b35530 8000000788ef7950 8000000788ef7950
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257]
> > 8000000787936c00 0000000000000002 ffffffffc0285294 00000000000049ba
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257]
> > 0000000000000001 00000000000049ba 0000000000000001 ffffffff80b2aa90
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257]
> > 0000000000000001 ffffffff80e1db78 8000000787936c00 ffffffff80e204b8
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257]
> > 800000078785b9c0 80000007fde8bb30 8000000787936c00 0000000100000000
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257]
> > ffffffffc0280000 80000007eff43920 8000000788ca0198 ffffffffc027edec
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257]
> > 80000007eff43900 c000000001f5b080 80000007eff43920 ffffffffc01dc2c0
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257]
> > 80000007eb29bd80 0000000000000000 0000000002400000 80000007eff42900
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257]
> > 00000000000049ba ffffffff80b2abec 8000000788ef7a50 8000000788ef7a50
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257]
> > ffffffffc01dbad8 c000000001f5b080 c000000001f5b080 80000007eff43900
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061257] ...
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061375] Call Trace:
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061392]
> > [<ffffffff80e1d4a8>] __schedule+0x3c0/0xa58
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061435]
> > [<ffffffff80e1db78>] schedule+0x38/0x98
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061445]
> > [<ffffffff80e204b8>] __down_read+0xa8/0xf0
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061463]
> > [<ffffffffc027edec>] do_origin.isra.13+0x44/0x110 [dm_snapshot]
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061509]
> > [<ffffffffc01dc2c0>] __map_bio+0xb0/0x258 [dm_mod]
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061563]
> > [<ffffffffc01deb94>] __split_and_process_bio+0x274/0x488 [dm_mod]
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061598]
> > [<ffffffffc01dee3c>] dm_make_request+0x94/0x128 [dm_mod]
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061624]
> > [<ffffffff80b3347c>] generic_make_request+0x114/0x290
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061674]
> > [<ffffffffc0511090>] drbd_submit_peer_request+0x258/0x618 [drbd]
> > Sep 24 12:08:49.006513 warn CFPU-1 kernel: [ 280.061739]
> > [<ffffffffc0512c78>] receive_Data+0x6c8/0x1368 [drbd]
> > Sep 24 12:08:49.007987 warn CFPU-1 kernel: [ 280.061816]
> > [<ffffffffc0515b30>] drbd_receiver+0x210/0x420 [drbd]
> > Sep 24 12:08:49.007987 warn CFPU-1 kernel: [ 280.061882]
> > [<ffffffffc0523a3c>] drbd_thread_setup+0x74/0x1a8 [drbd]
> > Sep 24 12:08:49.007987 warn CFPU-1 kernel: [ 280.061922]
> > [<ffffffff808b813c>] kthread+0xdc/0xf8
> > Sep 24 12:08:49.007987 warn CFPU-1 kernel: [ 280.061931]
> > [<ffffffff8086bf28>] ret_from_kernel_thread+0x14/0x1c
> > Sep 24 12:08:49.007987 warn CFPU-1 kernel: [ 280.061937]
> > Sep 24 12:08:49.007987 err CFPU-1 kernel: [ 280.061948] INFO: task
> > drbd_r_r6:7991 blocked for more than 120 seconds.
> > Sep 24 12:08:49.013584 err CFPU-1 kernel: [ 280.068669]
> > Tainted: P O 4.4.184-octeon-distro.git-v2.96-4-rc-wnd #1
> > Sep 24 12:08:49.021541 err CFPU-1 kernel: [ 280.076683] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > Sep 24 12:08:49.029370 info CFPU-1 kernel: [ 280.084523] drbd_r_r6
> > D ffffffff80e1db78 0 7991 2 0x00100002
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532] Stack :
> > 0000000000000001 ffffffff80b35530 800000078785b950 800000078785b950
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532]
> > 8000000787b79b00 0000000000000002 ffffffffc0285294 000000000000049a
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532]
> > 0000000000000001 000000000000049a 0000000000000001 ffffffff80b2aa90
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532]
> > 0000000000000001 ffffffff80e1db78 8000000787b79b00 ffffffff80e204b8
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532]
> > 800000078465b940 8000000788ef79c0 8000000787b79b00 0000000100000000
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532]
> > ffffffffc0280000 80000007e90d6c20 80000007878cf2d8 ffffffffc027edec
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532]
> > 80000007e90d6c00 c000000001fcc080 80000007e90d6c20 ffffffffc01dc2c0
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532]
> > 80000007f93fd900 0000000000000000 0000000002400000 80000007e90d6a00
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532]
> > 000000000000049a ffffffff80b2abec 800000078785ba50 800000078785ba50
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532]
> > ffffffffc01dbad8 c000000001fcc080 c000000001fcc080 80000007e90d6c00
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084532] ...
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084610] Call Trace:
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084621]
> > [<ffffffff80e1d4a8>] __schedule+0x3c0/0xa58
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084631]
> > [<ffffffff80e1db78>] schedule+0x38/0x98
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084641]
> > [<ffffffff80e204b8>] __down_read+0xa8/0xf0
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084659]
> > [<ffffffffc027edec>] do_origin.isra.13+0x44/0x110 [dm_snapshot]
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084696]
> > [<ffffffffc01dc2c0>] __map_bio+0xb0/0x258 [dm_mod]
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084729]
> > [<ffffffffc01deb94>] __split_and_process_bio+0x274/0x488 [dm_mod]
> > Sep 24 12:08:49.029567 warn CFPU-1 kernel: [ 280.084777]
> > [<ffffffffc01dee3c>] dm_make_request+0x94/0x128 [dm_mod]
> > Sep 24 12:08:49.031000 warn CFPU-1 kernel: [ 280.084810]
> > [<ffffffff80b3347c>] generic_make_request+0x114/0x290
> > Sep 24 12:08:49.031000 warn CFPU-1 kernel: [ 280.084863]
> > [<ffffffffc0511090>] drbd_submit_peer_request+0x258/0x618 [drbd]
> > Sep 24 12:08:49.031000 warn CFPU-1 kernel: [ 280.084928]
> > [<ffffffffc0512c78>] receive_Data+0x6c8/0x1368 [drbd]
> > Sep 24 12:08:49.031000 warn CFPU-1 kernel: [ 280.084992]
> > [<ffffffffc0515b30>] drbd_receiver+0x210/0x420 [drbd]
> > Sep 24 12:08:49.031000 warn CFPU-1 kernel: [ 280.085057]
> > [<ffffffffc0523a3c>] drbd_thread_setup+0x74/0x1a8 [drbd]
> > Sep 24 12:08:49.031000 warn CFPU-1 kernel: [ 280.085097]
> > [<ffffffff808b813c>] kthread+0xdc/0xf8
> > Sep 24 12:08:49.031000 warn CFPU-1 kernel: [ 280.085106]
> > [<ffffffff8086bf28>] ret_from_kernel_thread+0x14/0x1c
> > Sep 24 12:08:49.031000 warn CFPU-1 kernel: [ 280.085112]
> > Sep 24 12:08:49.031000 err CFPU-1 kernel: [ 280.085121] INFO: task
> > drbd_r_r7:8046 blocked for more than 120 seconds.
> > Sep 24 12:08:49.036834 err CFPU-1 kernel: [ 280.091854]
> > Tainted: P O 4.4.184-octeon-distro.git-v2.96-4-rc-wnd #1
> > Sep 24 12:08:49.044747 err CFPU-1 kernel: [ 280.099876] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > Sep 24 12:08:49.056612 info CFPU-1 kernel: [ 280.107739] drbd_r_r7
> > D ffffffff80e1db78 0 8046 2 0x00100000
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749] Stack :
> > 0000000000000000 0000000000000010 ffffffff811b3a80 0000000000000000
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749]
> > 7fffffffffffffff 7fffffffffffffff 0000000000000000 0000000000000002
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749]
> > 8000000788fcfa98 0000000000000000 ffffffffc053baa8 ffffffff80be4360
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749]
> > ffffffffc0550000 ffffffff80e1db78 ffffffff81070660 ffffffff80e208d8
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749]
> > 8000000797a43600 ffffffff808c4878 80000007ff2f4100 0000000000000000
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749]
> > 80000007f93fdb40 0000000000000000 80000007ff007000 ffffffff81070660
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749]
> > 8000000788fcfa90 7fffffffffffffff 0000000000000000 0000000000000002
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749]
> > 8000000788fcfa98 ffffffff80e1e8a0 0000000100000000 8000000797a42880
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749]
> > ffffffff808c4b60 8000000788fcfaa0 8000000788fcfaa0 ffffffffc053baa8
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749]
> > ffffffff80be4360 ffffffff81cb4540 ffffffff81cb0000 80000007f93fdb40
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107749] ...
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107821] Call Trace:
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107833]
> > [<ffffffff80e1d4a8>] __schedule+0x3c0/0xa58
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107842]
> > [<ffffffff80e1db78>] schedule+0x38/0x98
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107850]
> > [<ffffffff80e208d8>] schedule_timeout+0x240/0x2a0
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107859]
> > [<ffffffff80e1e8a0>] wait_for_common+0xd8/0x1b0
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107873]
> > [<ffffffff808acc20>] call_usermodehelper_exec+0x110/0x188
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107932]
> > [<ffffffffc053da3c>] drbd_khelper+0x1c4/0x310 [drbd]
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.107998]
> > [<ffffffffc0500a14>] drbd_start_resync+0x534/0x968 [drbd]
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.108060]
> > [<ffffffffc05037dc>] receive_sync_uuid+0x2d4/0x5a0 [drbd]
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.108124]
> > [<ffffffffc0515b30>] drbd_receiver+0x210/0x420 [drbd]
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.108189]
> > [<ffffffffc0523a3c>] drbd_thread_setup+0x74/0x1a8 [drbd]
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.108229]
> > [<ffffffff808b813c>] kthread+0xdc/0xf8
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.108239]
> > [<ffffffff8086bf28>] ret_from_kernel_thread+0x14/0x1c
> > Sep 24 12:08:49.056612 warn CFPU-1 kernel: [ 280.108245]
> > Sep 24 12:08:49.056612 err CFPU-1 kernel: [ 280.108471] INFO: task
> > drbd_r_r8:8120 blocked for more than 120 seconds.
> > Sep 24 12:08:49.060085 err CFPU-1 kernel: [ 280.115194]
> > Tainted: P O 4.4.184-octeon-distro.git-v2.96-4-rc-wnd #1
> > Sep 24 12:08:49.075924 err CFPU-1 kernel: [ 280.123218] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > Sep 24 12:08:49.075924 info CFPU-1 kernel: [ 280.131070] drbd_r_r8
> > D ffffffff80e1db78 0 8120 2 0x00100002
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083] Stack :
> > 0000000000000000 0000000000000010 ffffffff811b3a80 0000000000000000
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083]
> > 7fffffffffffffff 7fffffffffffffff 0000000000000000 0000000000000002
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083]
> > 80000007851d3a98 0000000000000000 ffffffffc053baa8 ffffffff80be4360
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083]
> > ffffffffc0550000 ffffffff80e1db78 ffffffff81070660 ffffffff80e208d8
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083]
> > 80000007f96f6c00 ffffffff808c4878 80000007ff2f4100 0000000000000000
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083]
> > 80000007ee99f360 0000000000000000 80000007ff007000 ffffffff81070660
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083]
> > 80000007851d3a90 7fffffffffffffff 0000000000000000 0000000000000002
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083]
> > 80000007851d3a98 ffffffff80e1e8a0 0000000100000000 8000000784ba3600
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083]
> > ffffffff808c4b60 80000007851d3aa0 80000007851d3aa0 ffffffffc053baa8
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083]
> > ffffffff80be4360 ffffffff81cb4540 ffffffff81cb0000 80000007ee99f360
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131083] ...
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131162] Call Trace:
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131174]
> > [<ffffffff80e1d4a8>] __schedule+0x3c0/0xa58
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131183]
> > [<ffffffff80e1db78>] schedule+0x38/0x98
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131195]
> > [<ffffffff80e208d8>] schedule_timeout+0x240/0x2a0
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131204]
> > [<ffffffff80e1e8a0>] wait_for_common+0xd8/0x1b0
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131216]
> > [<ffffffff808acc20>] call_usermodehelper_exec+0x110/0x188
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131274]
> > [<ffffffffc053da3c>] drbd_khelper+0x1c4/0x310 [drbd]
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131341]
> > [<ffffffffc0500a14>] drbd_start_resync+0x534/0x968 [drbd]
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131403]
> > [<ffffffffc05037dc>] receive_sync_uuid+0x2d4/0x5a0 [drbd]
> > Sep 24 12:08:49.076256 warn CFPU-1 kernel: [ 280.131482]
> > [<ffffffffc0515b30>] drbd_receiver+0x210/0x420 [drbd]
> > Sep 24 12:08:49.077857 warn CFPU-1 kernel: [ 280.131557]
> > [<ffffffffc0523a3c>] drbd_thread_setup+0x74/0x1a8 [drbd]
> > Sep 24 12:08:49.077857 warn CFPU-1 kernel: [ 280.131597]
> > [<ffffffff808b813c>] kthread+0xdc/0xf8
> > Sep 24 12:08:49.077857 warn CFPU-1 kernel: [ 280.131606]
> > [<ffffffff8086bf28>] ret_from_kernel_thread+0x14/0x1c
> > Sep 24 12:08:49.077857 warn CFPU-1 kernel: [ 280.131612]
> > Sep 24 12:08:49.077857 err CFPU-1 kernel: [ 280.131641] INFO: task
> > drbd_r_r9:8173 blocked for more than 120 seconds.
> > Sep 24 12:08:49.091245 err CFPU-1 kernel: [ 280.138358]
> > Tainted: P O 4.4.184-octeon-distro.git-v2.96-4-rc-wnd #1
> > Sep 24 12:08:49.091245 err CFPU-1 kernel: [ 280.146373] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > Sep 24 12:08:49.099067 info CFPU-1 kernel: [ 280.154219] drbd_r_r9
> > D ffffffff80e1db78 0 8173 2 0x00100002
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229] Stack :
> > 0000000000000000 0000000000000010 ffffffff811b3a80 0000000000000000
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229]
> > 7fffffffffffffff 7fffffffffffffff 0000000000000000 0000000000000002
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229]
> > 8000000783c9fa98 0000000000000000 ffffffffc053baa8 ffffffff80be4360
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229]
> > ffffffffc0550000 ffffffff80e1db78 ffffffff81070660 ffffffff80e208d8
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229]
> > 8000000797a45100 ffffffff808c4878 80000007ff2f4100 0000000000000000
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229]
> > 8000000788ca9d20 0000000000000000 80000007ff007000 ffffffff81070660
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229]
> > 8000000783c9fa90 7fffffffffffffff 0000000000000000 0000000000000002
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229]
> > 8000000783c9fa98 ffffffff80e1e8a0 0000000100000000 80000007843d4380
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229]
> > ffffffff808c4b60 8000000783c9faa0 8000000783c9faa0 ffffffffc053baa8
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229]
> > ffffffff80be4360 ffffffff81cb4540 ffffffff81cb0000 8000000788ca9d20
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154229] ...
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154305] Call Trace:
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154315]
> > [<ffffffff80e1d4a8>] __schedule+0x3c0/0xa58
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154325]
> > [<ffffffff80e1db78>] schedule+0x38/0x98
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154333]
> > [<ffffffff80e208d8>] schedule_timeout+0x240/0x2a0
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154342]
> > [<ffffffff80e1e8a0>] wait_for_common+0xd8/0x1b0
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154354]
> > [<ffffffff808acc20>] call_usermodehelper_exec+0x110/0x188
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154410]
> > [<ffffffffc053da3c>] drbd_khelper+0x1c4/0x310 [drbd]
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154475]
> > [<ffffffffc0500a14>] drbd_start_resync+0x534/0x968 [drbd]
> > Sep 24 12:08:49.099314 warn CFPU-1 kernel: [ 280.154540]
> > [<ffffffffc05037dc>] receive_sync_uuid+0x2d4/0x5a0 [drbd]
> > Sep 24 12:08:49.100714 warn CFPU-1 kernel: [ 280.154612]
> > [<ffffffffc0515b30>] drbd_receiver+0x210/0x420 [drbd]
> > Sep 24 12:08:49.100714 warn CFPU-1 kernel: [ 280.154678]
> > [<ffffffffc0523a3c>] drbd_thread_setup+0x74/0x1a8 [drbd]
> > Sep 24 12:08:49.100714 warn CFPU-1 kernel: [ 280.154717]
> > [<ffffffff808b813c>] kthread+0xdc/0xf8
> > Sep 24 12:08:49.100714 warn CFPU-1 kernel: [ 280.154726]
> > [<ffffffff8086bf28>] ret_from_kernel_thread+0x14/0x1c
> > Sep 24 12:08:49.100714 warn CFPU-1 kernel: [ 280.154732]
> > Sep 24 12:08:49.100714 err CFPU-1 kernel: [ 280.154742] INFO: task
> > drbd_r_r10:8254 blocked for more than 120 seconds.
> > Sep 24 12:08:49.106539 err CFPU-1 kernel: [ 280.161554]
> > Tainted: P O 4.4.184-octeon-distro.git-v2.96-4-rc-wnd #1
> > Sep 24 12:08:49.114430 err CFPU-1 kernel: [ 280.169569] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > Sep 24 12:08:49.129749 info CFPU-1 kernel: [ 280.177434] drbd_r_r10
> > D ffffffff80e1db78 0 8254 2 0x00100002
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445] Stack :
> > 0000000000000000 0000000000000010 ffffffff811b3a80 0000000000000000
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445]
> > 7fffffffffffffff 7fffffffffffffff 0000000000000000 0000000000000002
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445]
> > 80000007846efa98 0000000000000000 ffffffffc053baa8 ffffffff80be4360
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445]
> > ffffffffc0550000 ffffffff80e1db78 ffffffff81070660 ffffffff80e208d8
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445]
> > 8000000784893600 ffffffff808c4878 80000007ff2f4100 0000000000000000
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445]
> > 80000007e9498180 0000000000000000 80000007ff007000 ffffffff81070660
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445]
> > 80000007846efa90 7fffffffffffffff 0000000000000000 0000000000000002
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445]
> > 80000007846efa98 ffffffff80e1e8a0 0000000100000000 8000000783cf8d80
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445]
> > ffffffff808c4b60 80000007846efaa0 80000007846efaa0 ffffffffc053baa8
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445]
> > ffffffff80be4360 ffffffff81cb4540 ffffffff81cb0000 80000007e9498180
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177445] ...
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177517] Call Trace:
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177529]
> > [<ffffffff80e1d4a8>] __schedule+0x3c0/0xa58
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177539]
> > [<ffffffff80e1db78>] schedule+0x38/0x98
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177547]
> > [<ffffffff80e208d8>] schedule_timeout+0x240/0x2a0
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177556]
> > [<ffffffff80e1e8a0>] wait_for_common+0xd8/0x1b0
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177569]
> > [<ffffffff808acc20>] call_usermodehelper_exec+0x110/0x188
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177631]
> > [<ffffffffc053da3c>] drbd_khelper+0x1c4/0x310 [drbd]
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177697]
> > [<ffffffffc0500a14>] drbd_start_resync+0x534/0x968 [drbd]
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177760]
> > [<ffffffffc05037dc>] receive_sync_uuid+0x2d4/0x5a0 [drbd]
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177823]
> > [<ffffffffc0515b30>] drbd_receiver+0x210/0x420 [drbd]
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177888]
> > [<ffffffffc0523a3c>] drbd_thread_setup+0x74/0x1a8 [drbd]
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177928]
> > [<ffffffff808b813c>] kthread+0xdc/0xf8
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177938]
> > [<ffffffff8086bf28>] ret_from_kernel_thread+0x14/0x1c
> > Sep 24 12:08:49.129749 warn CFPU-1 kernel: [ 280.177944]
> > Sep 24 12:08:49.129749 err CFPU-1 kernel: [ 280.177960] INFO: task
> > drbd_r_r11:8328 blocked for more than 120 seconds.
> > Sep 24 12:08:49.129749 err CFPU-1 kernel: [ 280.184775]
> > Tainted: P O 4.4.184-octeon-distro.git-v2.96-4-rc-wnd #1
> > Sep 24 12:08:49.137674 err CFPU-1 kernel: [ 280.192793] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > Sep 24 12:08:49.152797 info CFPU-1 kernel: [ 280.200644] drbd_r_r11
> > D ffffffff80e1db78 0 8328 2 0x00100002
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654] Stack :
> > 0000000000000000 0000000000000010 ffffffff811b3a80 0000000000000000
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654]
> > 7fffffffffffffff 7fffffffffffffff 0000000000000000 0000000000000002
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654]
> > 8000000783c5fa98 0000000000000000 ffffffffc053baa8 ffffffff80be4360
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654]
> > ffffffffc0550000 ffffffff80e1db78 ffffffff81070660 ffffffff80e208d8
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654]
> > 8000000787935100 ffffffff808c4878 80000007ff2f4100 0000000000000000
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654]
> > 80000007eebd25a0 0000000000000000 80000007ff007000 ffffffff81070660
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654]
> > 8000000783c5fa90 7fffffffffffffff 0000000000000000 0000000000000002
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654]
> > 8000000783c5fa98 ffffffff80e1e8a0 0000000100000000 800000078371de80
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654]
> > ffffffff808c4b60 8000000783c5faa0 8000000783c5faa0 ffffffffc053baa8
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654]
> > ffffffff80be4360 ffffffff81cb4540 ffffffff81cb0000 80000007eebd25a0
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200654] ...
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200726] Call Trace:
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200739]
> > [<ffffffff80e1d4a8>] __schedule+0x3c0/0xa58
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200749]
> > [<ffffffff80e1db78>] schedule+0x38/0x98
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200757]
> > [<ffffffff80e208d8>] schedule_timeout+0x240/0x2a0
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200766]
> > [<ffffffff80e1e8a0>] wait_for_common+0xd8/0x1b0
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200778]
> > [<ffffffff808acc20>] call_usermodehelper_exec+0x110/0x188
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200840]
> > [<ffffffffc053da3c>] drbd_khelper+0x1c4/0x310 [drbd]
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200906]
> > [<ffffffffc0500a14>] drbd_start_resync+0x534/0x968 [drbd]
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.200969]
> > [<ffffffffc05037dc>] receive_sync_uuid+0x2d4/0x5a0 [drbd]
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.201032]
> > [<ffffffffc0515b30>] drbd_receiver+0x210/0x420 [drbd]
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.201097]
> > [<ffffffffc0523a3c>] drbd_thread_setup+0x74/0x1a8 [drbd]
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.201137]
> > [<ffffffff808b813c>] kthread+0xdc/0xf8
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.201147]
> > [<ffffffff8086bf28>] ret_from_kernel_thread+0x14/0x1c
> > Sep 24 12:08:49.152797 warn CFPU-1 kernel: [ 280.201153]
> > Sep 24 12:08:49.152797 err CFPU-1 kernel: [ 280.201183] INFO: task
> > lvcreate:8585 blocked for more than 120 seconds.
> > Sep 24 12:08:49.152797 err CFPU-1 kernel: [ 280.207823]
> > Tainted: P O 4.4.184-octeon-distro.git-v2.96-4-rc-wnd #1
> > Sep 24 12:08:49.160715 err CFPU-1 kernel: [ 280.215860] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > Sep 24 12:08:49.168570 info CFPU-1 kernel: [ 280.223704] lvcreate
> > D ffffffff80e1db78 0 8585 8582 0x00100000
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719] Stack :
> > ffffffff809ce420 ffffffffc027e170 80000007ea05c720 ffffffff809ce014
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719]
> > ffffffffc0285294 ffffffffc0285290 8000000797bdb600 0000000000000002
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719]
> > ffffffffc02834d0 ffffffffc0280000 ffffffff809ce420 ffffffffc027e170
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719]
> > 80000007f9275d80 ffffffff80e1db78 ffffffffc0285294 ffffffff80e20584
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719]
> > 80000007fde8bb30 ffffffffc0285298 8000000797bdb600 0000000000000000
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719]
> > c00000000205a080 0000000000000000 c00000000205a080 80000007ea05c600
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719]
> > 80000007fec10300 ffffffffc027fd20 8000000780cb0150 ffffffffc01e2e9c
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719]
> > 00000008c0284b30 00000002c0284b30 80000007ea05c620 ffffffffc0280000
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719]
> > c00000000205a080 80000007ea05de00 0000000000000000 8000000780cb0150
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719]
> > 8000000780cb0160 0000000001d4c000 0000000000000000 8000000780cb0000
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223719] ...
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223796] Call Trace:
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223805]
> > [<ffffffff80e1d4a8>] __schedule+0x3c0/0xa58
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223814]
> > [<ffffffff80e1db78>] schedule+0x38/0x98
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223824]
> > [<ffffffff80e20584>] __down_write_nested+0x84/0xe8
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223843]
> > [<ffffffffc027fd20>] snapshot_ctr+0x4d0/0x868 [dm_snapshot]
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223886]
> > [<ffffffffc01e31d4>] dm_table_add_target+0x164/0x418 [dm_mod]
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223921]
> > [<ffffffffc01e7bdc>] table_load+0x194/0x478 [dm_mod]
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.223956]
> > [<ffffffffc01e8e1c>] ctl_ioctl+0x424/0x678 [dm_mod]
> > Sep 24 12:08:49.168796 warn CFPU-1 kernel: [ 280.224006]
> > [<ffffffffc01e90a0>] dm_ctl_ioctl+0x30/0x40 [dm_mod]
> > Sep 24 12:08:49.170177 warn CFPU-1 kernel: [ 280.224040]
> > [<ffffffff809f29cc>] do_vfs_ioctl+0x38c/0x5f8
> > Sep 24 12:08:49.170177 warn CFPU-1 kernel: [ 280.224049]
> > [<ffffffff809f2c98>] SyS_ioctl+0x60/0xc8
> > Sep 24 12:08:49.170177 warn CFPU-1 kernel: [ 280.224059]
> > [<ffffffff80879b70>] syscall_common+0x34/0x58
> > Sep 24 12:08:49.170177 warn CFPU-1 kernel: [ 280.224065]
> >
--
Guruswamy Basavaiah
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