Query on kgdb output

[1 at movesmountains.com]

Hi,
I'm seeing regular kernel panics on my new box with a fresh install of
7.0-RELEASE.  I'm trying to get some information out of kgdb by following
the instructions in the handbook - however, I'm getting a 'cannot access
memory' message when I try it:

odin2008# kgdb kernel.debug /var/crash/vmcore.1
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:
Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".
Cannot access memory at address 0x2fd9
(kgdb) where
#0  0x00000000 in ?? ()
(kgdb) quit


Am I doing something wrong, or does this point to a hardware failure?  (I'm
also seeing missing characters in /var/log/messages, which I addressed in a
separate mail; not sure if it's related).



Any help appreciated!

Yours,
Mark