Comment # 5 on bug 1179299 from Glei

In the mean time i swapped a suspicious (disk /dev/sdg). Yesterday i switched
from kernel 5.3.18-lp152.33 to the most recent, and this morning i got a IO
lockup again. I attached kernel messages, but i think, they are not complete,
because writes did not finish. After 1 hour waiting for "sync" to complete, i
had to hard reset, and switched back to the old kernel.
Nightly i have a lot of IO: mdcheck continues to run and backup routines read
from some filesystems and write to the backup volume. The backup volume has
been moved (with pvmove) from /dev/md3 to /dev/md1 after spwapping /dev/sdg.
During IO lockup i also saw md mismatch sector in range errors. I guess this is
due to IO lockup, but i will try to re-check /dev/md3 which usually takes 1-2
days.
The messages are grepped to show "kernel:" only messages. If you need more, i
can provide, but maybe not drop then here public.