Something happened and my unraid server became completely unresponsive. I looked in the syslog and it showed many entries with the following:

Quote

Apr  7 06:55:03 Unraid kernel: </NMI>
Apr  7 06:55:03 Unraid kernel: <TASK>
Apr  7 06:55:03 Unraid kernel: filemap_get_read_batch+0x158/0x16c
Apr  7 06:55:03 Unraid kernel: filemap_get_pages+0xa7/0x50c
Apr  7 06:55:03 Unraid kernel: ? srso_return_thunk+0x5/0x10
Apr  7 06:55:03 Unraid kernel: ? atime_needs_update+0x56/0xf7
Apr  7 06:55:03 Unraid kernel: ? srso_return_thunk+0x5/0x10
Apr  7 06:55:03 Unraid kernel: ? touch_atime+0x35/0x169
Apr  7 06:55:03 Unraid kernel: filemap_read+0xb8/0x26f
Apr  7 06:55:03 Unraid kernel: ? srso_return_thunk+0x5/0x10
Apr  7 06:55:03 Unraid kernel: ? update_load_avg+0x46/0x398
Apr  7 06:55:03 Unraid kernel: ? srso_return_thunk+0x5/0x10
Apr  7 06:55:03 Unraid kernel: ? srso_return_thunk+0x5/0x10
Apr  7 06:55:03 Unraid kernel: do_iter_readv_writev+0x96/0xdd
Apr  7 06:55:03 Unraid kernel: do_iter_read+0x74/0xb9
Apr  7 06:55:03 Unraid kernel: loop_process_work+0x4b7/0x607
Apr  7 06:55:03 Unraid kernel: process_one_work+0x1ab/0x295
Apr  7 06:55:03 Unraid kernel: worker_thread+0x18b/0x244
Apr  7 06:55:03 Unraid kernel: ? rescuer_thread+0x281/0x281
Apr  7 06:55:03 Unraid kernel: kthread+0xe7/0xef
Apr  7 06:55:03 Unraid kernel: ? kthread_complete_and_exit+0x1b/0x1b
Apr  7 06:55:03 Unraid kernel: ret_from_fork+0x22/0x30
Apr  7 06:55:03 Unraid kernel: </TASK>
Apr  7 06:58:15 Unraid kernel: rcu: INFO: rcu_preempt self-detected stall on CPU

It's not clear to me though what has caused this error? Something about NMI?

 

syslog-previous

There are also multiple out of memory events logged, chrome appears to be the culprit, so try limiting the RAM usage for whatever container uses that.