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Date:      Wed, 18 Sep 2024 17:19:31 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 281560] gve (4) uma deadlock during high tcp throughput
Message-ID:  <bug-281560-7501-mDaScWrIOF@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-281560-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-281560-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D281560

--- 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/#kernelde=
bug-deadlocks
and the deadlock reproduces without any findings from INVARIANTS or WITNESS=
.=20=20

`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).=20=20

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?

--=20
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