[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 #92 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to George Mitchell from comment #91)

So, apparently, this was not one of the UFS-only experiments.


The gdb backtrace is messy:

. . .
#7  <signal handler called>
. . .
#27 <signal handler called>
#28 0x00000000002881da in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffffffd688

This indicates  that we are not seeing evidence from the
earlier problem that got #27. That, in turn, may or may not have
been the original problem.

The context looks to be a very different context than prior
reports. But not seeing what lead to #27 makes forming solid
judgments problematical.


I see from this that a modern gdb (kgdb) was in use for this
failure for the crashinfo generation after the savecore operation,
having no problems with DWARF 4  vs. 2. But it would seem to be
the boot media normally used with ZFS instead of the boot media
intended for UFS-only testing. The two might be different for
what is around for gdb (kgdb) for crashinfo to use.

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