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

Jim Gallacher jg.lists at sympatico.ca
Thu Aug 11 14:27:46 EDT 2005

Huzaifa Tapal wrote:
> 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  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?

Only what google tells me. Any chance you are serving content from nfs?


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