From mboxrd@z Thu Jan  1 00:00:00 1970
From: Unni <unni@lab.mutexes.org>
Subject: iptable stop hung
Date: Thu, 17 May 2012 19:00:35 +0530
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Hi,

"iptable stop" got hung in the server, so I killed that process. But 
still there is a modprobe process running there, that I can't kill.

oot     13834 99.8  0.0   3884   596 ?        R    11:15 132:39 
/sbin/modprobe -q -r ipt_state ip_nat_ftp iptable_nat xt_NOTRACK 
ip_conntrack_ftp ip_conntrack_netbios_ns xt_connlimit ip_conntrack 
ipt_recent

This is what I can see in dmesg

http://pastebin.com/BxEsyByC

--Unni