[Bug 244118] 13-CURRENT Kernel post r357547 hang during boot on PowerMac G5Q

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244118

--- Comment #9 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Mark Millard from comment #8)

I got to thinking about my history investigating
and I think this is too early for the device to
be available for dump to use.

Also the hangup likely prevents getting to ddb.

So I set up -r357550's artifact materials on a
SSD and got into ddb somewhat before the lockup.

One part of acttrace looked potentially interesting
(typed from a picture and avoiding typing everything
for now):

Tracing command cam pid 7 tid 100034 td  . . . (CPU3)
intr_event_handle
powerpc_dispatch_intr
openpic_dispatch
powerpc_interrupt
kernel EXI trap by __mtx_unlock_flags
__mtx_unlock_flags
xpt_copy_path
xpt_async
cam_periph_error
probe_done
xpt_done_process
xpt_done_td
fork_exit
fork_trampoline
-0x04

I've still got the picture to extract other details from
if required.

For thread 100034, "show locks" reported one:
(I split the line below)

exclusive sleep mutex CAM device lock (CAM device lock)
r = 0 (. . .) locked @ /usr/src/sys/cam/cam_xpt.c:5490

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