> It seems to fix it, yes. Now I don't get any hangs any more. I just tested using your configuration, and a recent centos8 image running dd loop inside it:
# while dd if=/dev/urandom of=testfile.raw bs=1M count=100; do sync; done With that, I am unable to trigger the bug. Would you mind running the test using a Debian Buster image running "stress-ng -d 5" inside? I (and to other people here) can trigger the bug quite reliable with that. On Debian, you can easily install stress-ng using apt: # apt update # apt install stress-ng Seems stress-ng uses a different write pattern which can trigger the bug more reliable.
