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Date:      Tue, 07 Feb 2023 15:23:23 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 267028] kernel panics when booting with ZFS and amdgpu.ko (both are required)
Message-ID:  <bug-267028-3630-FJQOz6nW5B@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-267028-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-267028-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D267028

--- Comment #53 from George Mitchell <george@m5p.com> ---
(In reply to Graham Perrin from comment #10)

It does appear that amdgpu.ko always loads successfully.  But then the load=
ing
of some other module subsequently (which might be zfs.ko or vboxnetflt.ko or
maybe something else) somehow causes an unexpected call back into the amdgpu
code.  I have no idea how.

The current situation:
1. zfs.ko is loaded from /boot/loader.conf.
2. I always boot into single user mode.
3. The last few times, I had kld_list=3D"amdgpu.ko" in my /etc/rc.conf, but=
 for
now I'm taking it back out.
4. So I'm loading amdgpu.ko manually in single user mode and then waiting t=
en
seconds or so before going multiuser.  It's voodoo but it usually avoids the
crash.

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