[Bug 267028] kernel panics when booting with both (zfs,ko or vboxnetflt,ko or acpi_wmi.ko) and amdgpu.ko

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

--- Comment #177 from George Mitchell <george@m5p.com> ---
Yes, even after updating to 13.3-RELEASE-p4.  I'm not brave enough yet to
upgrade to 14.   I work around the problem by booting in single-user mode,
running this script:

#!/bin/sh
mount -u /
mount -r /usr
kldload amdgpu.ko
kldload zfs.ko
kldload vboxnetflt.ko
kldload acpi_wmi.ko
sleep 3
mount -u /usr

which 99% of the time doesn't crash, and then exiting to multiuser.  I haven't
yet figured out how to get a crash dump with /, /tmp/, and /var/ mounted R/W
(they're all on one physical partition) and /usr/ mounted RO.

Probably irrelevant fact: every time I start chrome from the command line, I
get the message:

ammdgpu: os_same_file_description couldn't determine if two DRM fds reference
the same file description.
If they do, bad things may happen!

But in fact there seem to be no ill effects.

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