[Bug 267028] kernel panics when booting with ZFS and amdgpu.ko (both are required)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267028

--- 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 loading
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="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 ten
seconds or so before going multiuser.  It's voodoo but it usually avoids the
crash.

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