Description of problem:
After upgrading from kernel-2.6.18-1.2200.fc5 to kernel-2.6.18-1.2239.fc5, a 
Linux Fedora Core 5 host began crashing regularly somewhere in netfilter, 
possibly as netfilter is called from / used by the bridge code.

Version-Release number of selected component (if applicable):
2.6.18-1.2239.fc5

How reproducible:
Unsure.

Steps to Reproduce:
1. Upgrade from 2.6.18-1.2200 to 2.6.18-1.2239
2. Wait a few minutes.
3. <System crashes>
  
Actual results:
Crash.

Expected results:
No crash.

Additional info:
Downgrading back to 2.6.18-1.2200.fc5 stopped the crashing.
Nothing gets the chance to be written to system logs, and I do not have a 
serial console on this host. Therefore, the only detailed log information I 
have is a digital photograph of the last 24 lines left on the screen after the 
kernel panic. I will upload this digital photograph as an attachment to this 
report. Sorry for the lack of details.