Panic: APIC: Previous IPI is stuck (on recent current)

I came in this morning and noticed my dual-Athlon machine had
rebooted during the night.  I had just rebuilt current on it late
last Thursday night.  The previous rebuild had been on July 27th.
This is the first time it had crashed on me in quite some time.
The machine is not doing much, other than it usually has two copies
of the "folding at home" client running.  Other than that it's just
use as a testing machine, and as a hot-backup for another server
that I have.  The dump "info" file says:

Good dump found on device /dev/ad0s4b
   Architecture: i386
   Architecture version: 1
   Dump length: 1073217536B (1023 MB)
   Blocksize: 512
   Dumptime: Mon Aug 16 01:53:21 2004
   Hostname: santropez.netel.rpi.edu
   Versionstring: FreeBSD 5.2-CURRENT #0: Fri Aug 13 00:20:36 EDT 2004
     root_at_santropez.netel.rpi.edu:/usr/obj/usr/src/sys/Dual-Athlon2k
   Panicstring: APIC: Previous IPI is stuck

There is a 1-gig dump file sitting here.  I don't know who would
be the most interested in this, or what I should do with it.  If
you need more information, let me know what to do.

I tried following the advice at

http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-gdb.html

but that web page suggests:
     gdb -k kernel.debug /var/crash/vmcore.0

and the gdb that I have replied:
     gdb: unrecognized option `-k'

-- 
Garance Alistair Drosehn            =   gad_at_gilead.netel.rpi.edu
Senior Systems Programmer           or  gad_at_freebsd.org
Rensselaer Polytechnic Institute    or  drosih_at_rpi.edu