[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 #304 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to George Mitchell from comment #303)

I moved all the information recording into static storage
and eliminated the printf messages that I'd used before.
The log showed no attempt to put a dump into the swap
space. I figured the static storage would be less
invasive. But it may just be differently invasive.

It is possible that the memory layout differences have
changed the behavior of the code (different bad memory
places referenced, with different consequences. Similary,
the recording of history would change the relative timing
of potential race conditions and such but differently
than all the activity for printf output.

Nothing I did should be a valid fix, even if it
accidentally improves things for you in some contexts.
What I did presumes that you would not be unloading
or reloading modules or such, for example. It is very
specific to gathering information from the specifics
of the context of failure, not for operation in general
use.

If this kernel does not produce the failure anywhere
near as often, an interesting experiment might be to
disable all use of the extra static storage but to
leave the extra storage present: in essence, to only
change the memory layout, not any operation.

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