What I am interested in: Is there anybody who had the same problem ?
There have been some reports of similar panics on the Shorewall Users mailing list. These are reported as panics from "shorewall show connections" which is a thin wrapper around "cat /proc/net/ip_conntrack".
The most recent reports were using RedHat kernels 2.4.20-28.7 and 2.4.20-30.7
-Tom -- Tom Eastep \ Nothing is foolproof to a sufficiently talented fool Shoreline, \ http://shorewall.net Washington USA \ teastep@xxxxxxxxxxxxx