[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 #274 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
If you could, I'd like to get a vmcore.* from a successful boot
for comparison/contrast with the failures we now have examples
of.

For reference . . .

From: https://docs.freebsd.org/en/books/developers-handbook/kerneldebug/

10.1.3. Testing Kernel Dump Configuration
The kernel includes a sysctl(8) node that requests a kernel
panic. This can be used to verify that your system is properly
configured to save kernel crash dumps. You may wish to remount
existing file systems as read-only in single user mode before
triggering the crash to avoid data loss.

# shutdown now
...
Enter full pathname of shell or RETURN for /bin/sh:
# mount -a -u -r
# sysctl debug.kdb.panic=1
debug.kdb.panic:panic: kdb_sysctl_panic
...

After rebooting, your system should save a dump in /var/crash
along with a matching summary from crashinfo(8).

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