22.02 PR: https://github.com/truenas/middleware/pull/8184

thank you! The primary underlying issue has probably been fixed in the newer nightly releases. I'll only fix the insufficient progress reporting issue then.

So I upload the latest

now. But I can't really reproduce the 10 min job anymore (was on an older version I don't have anymore).

from the file you've posted it seems that the dataset unlocking was in progress for 20 seconds and it was very close to the finish. If you have not rebooted the system since then, could you please attach the result of

So we can understand when the unlocking job in subject finished?

We need to profile what's taking it so long (10 minutes as you say). Current unlocking process does not report its progress (we'll fix that in 22.02) so we'll have to profile it ourselves. Can you please start unlocking job and run:

It will collect system state every 30 seconds for 10 minutes, resulting file will be /tmp/debug.txt

Thank you for your help!

I attached the debug.txt.