[Bug 224292] processes are hanging in state ufs / possible deadlock in file system

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224292

--- Comment #16 from Edward Tomasz Napierala <trasz at FreeBSD.org> ---
I believe I'm seeing the same problem on my T420.  It started a couple (three?)
months ago.  I'm not sure it's a deadlock/livelock, though: it almost seems
like a buffer is being written to disk over and over.

One particular case I remember is dd instance used to write out entropy (4k
write to a file somewhere in /var).  This was the culprit according to "top -m
io".  On some other occurences of this bug I've seen Firefox doing an absurd
amount of IO.  Assuming we can trust top(1), this aligns with the idea of a
buffer being written over and over.

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