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Date:      Wed, 21 Jul 2021 09:53:46 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 257298] kernel panic with kern.cam.da.enable_uma_ccbs=1
Message-ID:  <bug-257298-227-wmfVVQmCCv@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-257298-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-257298-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D257298

--- Comment #1 from pr@aoek.com ---
I hit the bug again with kern.cam.ada.enable_uma_ccbs=3D0

I also find out that my previous post was partially incorrect: I have to set
the .ada. version of the sysctl, no the .da. Please forgive me.

So, to summarize, under heavy work (poudriere with 16 builders):
kern.cam.(a)da.enable_uma_ccbs=3D1 -> kernel panics quickly
kern.cam.(a)da.enable_uma_ccbs=3D0 -> kernel panics in a few hours

If the kernel is GENERIC (with INVARIANTS) sometimes it hangs at boot/rc,
random positions (I assume then the first reset is issued). GENERIC-NODEBUG
usually boots ok.

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