While attempting to do a full filesystem defrag and checking output of df -h,
I've been able to fairly consistently generate a hang:
i.e. find / -type f -print0 | xargs -0i btrfsctl -d '{}'
and in another terminal, did "watch df -h"
Before long, everything hangs, iowait is near 100%, and no IO happens. I'm
unable to get anything out of the kernel logs postmortem, dmesg also hangs.
FWIW, I was mounted -o compress.--
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