From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Westphal <fw@strlen.de>
Subject: Re: (ipt_log_packet, sb_add) 3.6.0-rc2 kernel panic - not syncing;
 Fatal exception in interrupt
Date: Sun, 2 Sep 2012 15:28:34 +0200
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 <20120902122008.jgdhwowbuke6by7h@m.safari.iki.fi>
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To: Sami Farin <hvtaifwkbgefbaei@gmail.com>, netdev@vger.kernel.org,
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Sami Farin <hvtaifwkbgefbaei@gmail.com> wrote:
> I get this panic every 1-2 days.
> Also with 7a611e69b26069a511d9d5251c6a28af6c521121 (commit before 3.6.0-rc4).

Could you please post iptables-save output?
My guess is you're using NFLOG in INPUT?

If so, I bet its caused by the tcp early demux stuff.
Does that crash go away with ip_early_demux sysctl off?

My guess is its assigning skb->sk with TIMEWAIT sockets, which
would explain the crash.