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73416ba
(Get the code!)
As outlined before the time from device_del to the DEVICE_DELETED is indeed "a bit longer" in Focal (from ~0.1s to ~6s), but other than that I couldn't find anything else yet.
We were wondering due to [1] in a related bug if it might be dependent to (over)load.
I was consuming Disk and CPU in a controlled fashion (stress-ng --cpu 8 --io 4 --hdd 4 1x in the container the load is in and 1x on the Host). On that I was running attach/detach loops but in all of a two hundred retries it was "->device_del <-DEVICE_DELETED <-DEVICE_DELETED ->blockdev-del ->blockdev-del".
James Page was doing tests (thanks) with real Openstack and Ceph but couldn't - so far -trigger the issue either. He will likely later update the bug as well, but is currently trying to ramp up concurrency to more likely hit the issue.
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