[mod_python] kernel panic - Attempting to free lock with active waiting queue

Hello All,

I was wondering if any of you have run into any kernel panics running 
apache2 w/ mod_python 3.13 (patches applied) on kernel 2.6.12.4?  Under 
heavy load testing of approximately 520 concurrent users the server 
crashed with the message:

Kernel panic - Attempting to free lock with active waiting queue

We previously had a stock debian kernel version 2.6.08 and we had 
noticed that under a load of 36 concurrent users, sporadically, the 
server would crash immediately as the load test was started.  In the 
current case, after upgrading the kernel, the server did not crash until 
it reached the peak of 550 concurrent users.  I am currently running the 
load test again after rebootin the server and the server is handling 
requests even at 559 concurrent users so the panic is sporadic.

Anybody have any ideas?  Anybody seen anything like this before?

Hozi