It sounds more like the known bug in 2.6.7-1.494.2.2 that causes tcp_moderate_rcvbuf to pull in the TCP window to ridiculously small sizes, even with window scaling disabled.
Try 'echo 0 > /proc/sys/net/ipv4/tcp_moderate_rcvbuf', or else try the current testing kernel update for FC2.
I gave kernel-smp-2.6.8-1.520 a test run on my desktop before putting it on the server, and the kernel crashes on boot with an NFS error. I guess that that won't be a problem on the server, as the server isn't an NFS client. I'm not sure if it's the same bug which caused the 2.6.8.1 release.
BTW.... Is there any easy way to record the stack trace, etc from kernel crashes? Or do you have to use pen & paper?
Phil
