[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 #181 from George Mitchell <george@m5p.com> ---
After upgrading my system from 13.3-RELEASE-p8 to 13.4-RELEASE-p2 and
recompiling drm_510_kmod (getting version drm-510-kmod-5.10.163_10 as reported
by pkg info, despite the different version string seen below), I got a crah in
single-user mode that at least left intelligible text on the screen, though I
did not get a dump.  Here, manually transcribed (unfortunately), are the things
I saw:

(once) Fatal Trap 9 in kernel mode
(five times) kernel trap 22 with interrupts disabled

Backtrace:
kdb_backtrace
vpanic
panic
trap_fatal
call_trap
linker_load_dependencies
link_elf_load_file
linker_load_module
kern_kldload
sys_kldload
amd64_syscall
fast_syscall_common

The string "v5.10.163_7" once.  I don't know where it came from, and my system
log definitely says:

Dec  7 18:04:33 court pkg[1782]: drm-510-kmod-5.10.163_9 deinstalled
Dec  7 18:04:41 court pkg[1786]: drm-510-kmod-5.10.163_10 installed

That's all I have, regrettably.  Probably before the end of the year I will be
upgrading to 14-RELEASE.  Perhaps this helps.

Despite the involvement of the zfs, vboxnetflt, and acpi_wmi kernel modules,
none of those modules ever causes any trouble when drm-510-kmod is not present,
and my (long) software engineering experience tells me that the simplest
explanation is a bug in drm-510-kmod.

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