[CentOS] I have a test system that hangs hard...

Fri Mar 6 18:46:18 UTC 2009
Robert Moskowitz <rgm at htt-consult.com>

I have a test system:  Centos 5.2 on an OQO, that has been hanging 
hard.  I have to unplug it and pull the battery so I can then cold start it.

This last time all I did was open a terminal window and SU to root, then 
start the lastest build of SIP Communicator (which uses JRE 1.6.0_10).  
I was not even making a test phone call at the time.  Oh, and the system 
only runs IPv6, no v4 addressing.

So how do I find out what is causing the hard lockups?