2.6.15-1.1955_FC5 memory leak?

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I recently setup a server on the Internet in a fairly default FC5T2 
configuration.  I had it running kernel 2.6.15-1.1955_FC5 for 9 days when I 
noticed that it had apparently run out of kernel memory.  All processes were 
highly swapped and the OOM killer was killing processes (by the time I 
noticed the problem most services had been killed).

The machine is a P3 with 256M of RAM, it has full net access with no firewall 
(iptables is used in a fairly default configuration but there is nothing in 
front of the machine protecting it).

Is there a known kernel memory leak in 2.6.15-1.1955_FC5?

The machine in question has BIND, Postfix, Amavis + clamav, and Postgrey 
installed.  However as it doesn't yet have an MX record pointing to is there 
has been little use (some DNS traffic is all that it would get).

I tried rebooting the machine and it crashed.  I guess that the OOM killer 
killed something that was needed for a reboot.  Tomorrow when I get it 
running again I will upgrade it to the latest kernel.  Let me know if there 
are any tests I should perform if this happens again (unfortunately I can't 
get a net-dump server in there but disk-dump is an option I guess).

-- 
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