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0e1f616
(Get the code!)
I believe to resolve the deadlock you want to do:
echo active > /sys/block/
Not "idle". You should see a hung task for mdcheck in there somewhere as well, and it only occurs when the raid is resyncing (md_resync should be running), at least for me I the workaround in comment 5:
https:/
Haven't had a problem since, upgraded to 22.04 since then as well with 5.15. I am pretty sure the problem is still there, the problem surfaced in 20.04 when they changed the raid consistency check. The new check pauses the check after 8 hours and triggers the deadlock, I just let it run to completion like it did in 18.04.
I have not checked the patches, but it's possible you have a different problem because I don't see in either of two hung process traces any calls to md_ code.