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

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 07 Feb 2023 15:10:25 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267028

--- Comment #50 from George Mitchell <george@m5p.com> ---
Created attachment 239967
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=239967&action=edit
Crash after loading vboxnetflt early by hand

Since the previous crash included a reference to vboxnetflt.ko, I experimented
a few times with amdgpu.ko added to my kld_lst in /etc/rc.conf, and loading
vboxnetflt by hand after booting to single user mode.

I think it's pretty clear at this point that there is no problem in ZFS code. 
It's a lock mismanagement problem of some sort in amggpu.ko (from
graphics/drm-510-kmod).  If I have permission to change the assignee of this
bug, I will.

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