[Bug 267028] kernel panics when booting with ZFS and amdgpu.ko (both are required)

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

--- Comment #81 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to George Mitchell from comment #80)

There are multiple, distinct backtraces in your various examples.
This one matches the 4 still-listed-as Obsolete ones and the
"Latest crash dump" one, but not the others (if I remember right).

So it is another example where there is no mention of
dbuf or of zfs in the backtrace's text, unlike some other
backtraces.

So far as I can tell, there still has been no evidence gathering
seeing if the problem can happen absent zfs being loaded or zfs
loaded but no pools ever imported.

If I gather correctly, we now do have evidence that the specific
type of backtrace can happen without vboxnetflt.ko ever having
been loaded, proving it is not necessary for that kind of failure.
That is a form of progress as far as evidence goes. It also
suggests that merely being listed in a backtrace does not mean
that fact necessarily tells one much about the basic problem.

There is some possibility here that there is more than one basic
problem and some of the backtrace variability is associated with
that.

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