PVE kernel error

[subjectx]

Not sure, if this is anything critical..

Mar 22 13:47:09 backup kernel: INFO: task txg_sync:1780 blocked for more than 120 seconds.
Mar 22 13:47:09 backup kernel: Tainted: P O 5.4.103-1-pve #1
Mar 22 13:47:09 backup kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 22 13:47:09 backup kernel: txg_sync D 0 1780 2 0x80004000
Mar 22 13:47:09 backup kernel: Call Trace:
Mar 22 13:47:09 backup kernel: __schedule+0x2e6/0x700
Mar 22 13:47:09 backup kernel: schedule+0x33/0xa0
Mar 22 13:47:09 backup kernel: schedule_timeout+0x152/0x330
Mar 22 13:47:09 backup kernel: ? __next_timer_interrupt+0xd0/0xd0
Mar 22 13:47:09 backup kernel: io_schedule_timeout+0x1e/0x50
Mar 22 13:47:09 backup kernel: __cv_timedwait_common+0x138/0x170 [spl]
Mar 22 13:47:09 backup kernel: ? wait_woken+0x80/0x80
Mar 22 13:47:09 backup kernel: __cv_timedwait_io+0x19/0x20 [spl]
Mar 22 13:47:09 backup kernel: zio_wait+0x139/0x280 [zfs]
Mar 22 13:47:09 backup kernel: ? _cond_resched+0x19/0x30
Mar 22 13:47:09 backup kernel: dsl_pool_sync+0xdc/0x510 [zfs]
Mar 22 13:47:09 backup kernel: spa_sync+0x5a4/0xfe0 [zfs]
Mar 22 13:47:09 backup kernel: ? mutex_lock+0x12/0x30
Mar 22 13:47:09 backup kernel: ? spa_txg_history_init_io+0x104/0x110 [zfs]
Mar 22 13:47:09 backup kernel: txg_sync_thread+0x2e1/0x4a0 [zfs]
Mar 22 13:47:09 backup kernel: ? txg_thread_exit.isra.13+0x60/0x60 [zfs]
Mar 22 13:47:09 backup kernel: thread_generic_wrapper+0x74/0x90 [spl]
Mar 22 13:47:09 backup kernel: kthread+0x120/0x140
Mar 22 13:47:09 backup kernel: ? __thread_exit+0x20/0x20 [spl]
Mar 22 13:47:09 backup kernel: ? kthread_park+0x90/0x90
Mar 22 13:47:09 backup kernel: ret_from_fork+0x22/0x40

Anything I should be worried about?

 

[Stoiko Ivanov]

the hung_task messages for txg_sync can have multiple sources - most often they are the result of the storage devices you're using for a zpool being a bit too slow.
It could also indicate a bug in ZFS.

* Do the messages appear often in your logs?
* do they show up under certain conditions (e.g. running a backup, or other operations which cause high IO load)?

I hope this helps!

 

[subjectx]

Thank you for your reply.

They dont appear often and I think that time I noticed it was right in between testing backup settings, so yeah, could be slow HDDs and zfs on them.

Will keep an eye on it for sure.

Thank you again.

Regards, Anze