[Bug 281560] gve (4) uma deadlock during high tcp throughput

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 18 Sep 2024 17:19:31 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281560

--- Comment #2 from shailend@google.com ---
Actually I did run it with INVARIANTS and WITNESS and other options listed on
https://docs.freebsd.org/en/books/developers-handbook/kerneldebug/#kerneldebug-deadlocks
and the deadlock reproduces without any findings from INVARIANTS or WITNESS.  

`procstat -k ${tid?}` is the only only tool I know to look at the deadlocked
threads and that hints at some locking issue in the uma zone cache (as per the
per-thread procstat -k in comment #0).  

Are there some other ways I can look at the locked threads and more
definitively figure out what resource they are blocked on and who owns it?

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