I have recently had a problem with my server: all writes to RAID drives were frozen and I had to force-reboot it. I looked at kernel logs and I think dm-integrity might be source of the problem. Could anyone help me understand meaning of following messages (this message was repeated 8 times, full kernel log is here: https://pastebin.com/DMgMtNJq ):

Mar 1 23:48:21 unassigned-hostname kernel: [369732.498048] INFO: task kworker/0:112:26760 blocked for more than 120 seconds.

Mar 1 23:48:21 unassigned-hostname kernel: [369732.499784] Not tainted 4.19.0-2-amd64 #1 Debian 4.19.16-1

Mar 1 23:48:21 unassigned-hostname kernel: [369732.501222] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

Mar 1 23:48:21 unassigned-hostname kernel: [369732.503095] kworker/0:112 D 0 26760 2 0x80000080

Mar 1 23:48:21 unassigned-hostname kernel: [369732.504424] Workqueue: dm-integrity-metadata integrity_bio_wait [dm_integrity]

Mar 1 23:48:21 unassigned-hostname kernel: [369732.506149] Call Trace:

Mar 1 23:48:21 unassigned-hostname kernel: [369732.506782] ? __schedule+0x2a2/0x870

Mar 1 23:48:21 unassigned-hostname kernel: [369732.507706] schedule+0x28/0x80

Mar 1 23:48:21 unassigned-hostname kernel: [369732.508484] io_schedule+0x12/0x40

Mar 1 23:48:21 unassigned-hostname kernel: [369732.509321] wait_and_add_new_range+0x89/0xa0 [dm_integrity]

Mar 1 23:48:21 unassigned-hostname kernel: [369732.510709] dm_integrity_map_continue+0xe71/0x1020 [dm_integrity]

Mar 1 23:48:21 unassigned-hostname kernel: [369732.512193] ? __switch_to_asm+0x40/0x70

Mar 1 23:48:21 unassigned-hostname kernel: [369732.513149] ? __switch_to_asm+0x34/0x70

Mar 1 23:48:21 unassigned-hostname kernel: [369732.514105] ? __switch_to_asm+0x40/0x70

Mar 1 23:48:21 unassigned-hostname kernel: [369732.515088] ? __switch_to_asm+0x40/0x70

Mar 1 23:48:21 unassigned-hostname kernel: [369732.516048] ? __switch_to_asm+0x34/0x70

Mar 1 23:48:21 unassigned-hostname kernel: [369732.517000] ? __switch_to_asm+0x40/0x70

Mar 1 23:48:21 unassigned-hostname kernel: [369732.517978] ? __switch_to_asm+0x34/0x70

Mar 1 23:48:21 unassigned-hostname kernel: [369732.518968] ? __switch_to_asm+0x34/0x70

Mar 1 23:48:21 unassigned-hostname kernel: [369732.519926] ? __switch_to+0x8c/0x440

Mar 1 23:48:21 unassigned-hostname kernel: [369732.520822] process_one_work+0x1a7/0x3a0

Mar 1 23:48:21 unassigned-hostname kernel: [369732.521798] worker_thread+0x30/0x390

Mar 1 23:48:21 unassigned-hostname kernel: [369732.522725] ? pwq_unbound_release_workfn+0xd0/0xd0

Mar 1 23:48:21 unassigned-hostname kernel: [369732.523901] kthread+0x112/0x130

Mar 1 23:48:21 unassigned-hostname kernel: [369732.524691] ? kthread_bind+0x30/0x30

Mar 1 23:48:21 unassigned-hostname kernel: [369732.525584] ret_from_fork+0x35/0x40