FYI
I still have the issue on 3.13.0-91-generic (and 3.13.0-88-generic) on a busy NFS server using XFS. I have this issue since 2015...
INFO: task kworker/1:2:31748 blocked for more than 120 seconds. Not tainted 3.13.0-91-generic #138-Ubuntu "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:2 D ffff88023f433180 0 31748 2 0x00000000 Workqueue: xfs-log/dm-5 xfs_log_worker [xfs] ffff88012f31fb70 0000000000000046 ffff880035983000 0000000000013180 ffff88012f31ffd8 0000000000013180 ffff880035983000 ffff88012f31fcb8 ffff88012f31fcc0 7fffffffffffffff ffff880035983000 ffff8802317e9528 Call Trace: [<ffffffff8172dd89>] schedule+0x29/0x70 [<ffffffff8172cfd9>] schedule_timeout+0x279/0x310 [<ffffffff8172e896>] wait_for_completion+0xa6/0x150 [<ffffffff8109d2f0>] ? wake_up_state+0x20/0x20 [<ffffffff8108726d>] flush_work+0xed/0x1b0 [<ffffffff81083490>] ? wake_up_worker+0x30/0x30 [<ffffffffa01f0faf>] xlog_cil_force_lsn+0x3f/0x170 [xfs] ...
FYI
I still have the issue on 3.13.0-91-generic (and 3.13.0-88-generic)
on a busy NFS server using XFS. I have this issue since 2015...
INFO: task kworker/1:2:31748 blocked for more than 120 seconds. kernel/ hung_task_ timeout_ secs" disables this message. dd89>] schedule+0x29/0x70 cfd9>] schedule_ timeout+ 0x279/0x310 e896>] wait_for_ completion+ 0xa6/0x150 d2f0>] ? wake_up_ state+0x20/ 0x20 726d>] flush_work+ 0xed/0x1b0 3490>] ? wake_up_ worker+ 0x30/0x30 0faf>] xlog_cil_ force_lsn+ 0x3f/0x170 [xfs]
Not tainted 3.13.0-91-generic #138-Ubuntu
"echo 0 > /proc/sys/
kworker/1:2 D ffff88023f433180 0 31748 2 0x00000000
Workqueue: xfs-log/dm-5 xfs_log_worker [xfs]
ffff88012f31fb70 0000000000000046 ffff880035983000 0000000000013180
ffff88012f31ffd8 0000000000013180 ffff880035983000 ffff88012f31fcb8
ffff88012f31fcc0 7fffffffffffffff ffff880035983000 ffff8802317e9528
Call Trace:
[<ffffffff8172
[<ffffffff8172
[<ffffffff8172
[<ffffffff8109
[<ffffffff8108
[<ffffffff8108
[<ffffffffa01f
...