unknown panic

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

Shutting down a Dec 14 2013 10:40 -current/amd64 box, I got a panic + dump +
reboot. Thing is, the corefile doesn't seem to tell me anything:

(gdb) bt
#0  0xffffffff80479a7e in cpu_reboot (howto=260, bootstr=<optimized out>)
    at ../../../../arch/amd64/amd64/machdep.c:702
#1  0xffffffff8060f8fa in vpanic (fmt=0xffffffff808f932a "trap", 
    ap=0xfffffe810e59b6f0) at ../../../../kern/subr_prf.c:284
#2  0xffffffff8060f9ae in panic (fmt=<unavailable>)
    at ../../../../kern/subr_prf.c:200
#3  0xffffffff8064cc6d in trap (frame=0xfffffe810e59b830)
    at ../../../../arch/amd64/amd64/trap.c:294
#4  0xffffffff80100f66 in alltraps ()
#5  0x000000000041bc43 in ?? ()
#6  0x0000000000000001 in ?? ()
#7  0x0000000000000010 in ?? ()
#8  0x0000000000000000 in ?? ()
(gdb) info threads
  Id   Target Id         Frame 
* 1    <kvm>             0xffffffff80479a7e in ?? ()
(gdb) print panicstr
/usr/src/external/gpl3/gdb/dist/gdb/gdbarch.c:4328: internal-error: 
gdbarch_iterate_over_objfiles_in_search_order: Assertion `gdbarch != NULL' 
failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.


gdb trouble? (I did reopen bin/47430 yesterday)

Cheers,

Patrick