[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 #310 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Andriy Gapon from comment #308)

I'll also remind that back before the vmcore.*
files were involved in the investigations but
just looking at a backtrace that had been
reported in one of the examples ( see
comment #148 ) . . .

/*
 * Remove the references to the thread from all of the objects we were
 * polling.
 */
static void
seltdclear(struct thread *td)
{
        struct seltd *stp;
        struct selfd *sfp;
        struct selfd *sfn;

        stp = td->td_sel;
        STAILQ_FOREACH_SAFE(sfp, &stp->st_selq, sf_link, sfn)
                selfdfree(stp, sfp);
        stp->st_flags = 0;
}

It was a sfp value that ended up being reported as: 0xfffff80000000007
(so, again a next pointer in a list).

But it was a different type of node and a different list,
even STAILQ vs. not being different. Still the same odd
value showing up.

It was definitely not the same kernel or kernel.debug when
looking that far back in the investigations. The port
vintage involved was likely older as well?

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