[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 #287 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to George Mitchell from comment #286)

The variations I was looking at at are for vmcore.1 and
vmcore.3 , for example. The load ordering did not vary
but detailed address involved in the found_modules list
do vary.

Nothing you did caused any problems. It is just that
booting is not sequential/deterministic in detail.

In one respect, this variability contrasts with the
stability of the odd 0xfffff80000000007 value that
shows up part way through the list for the failing
boots. (We have yet to get an example that was
associated with a different list. But there are older
back-traces for such.)

The mini dumps have holes in what is searchable and
I'm not finding it practical to look for nodes from
the list that can no longer be reached because of the
0xfffff80000000007 but that likely would still be
well formed if found (likely not explicitly deleted).

It is getting to the point that if it was a local,
personal problem I was having, I'd probably make
tailored diagnostic-information additions to the
kernel so that I could see more related information
in the vmcore.* files (or elsewhere).

I've not identified any more to try with just after-
the-failure content for what is currently recored in
the vmcore.* files, at least for the found_modules
list related failures that are usually seen.

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