From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Westphal <fw@strlen.de>
Subject: Re: OOPS NULL pointer dereference in nf_nat_setup_info+0x471
 (reproductible, 3.14.4)
Date: Thu, 29 May 2014 20:32:53 +0200
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Cc: netfilter-devel@vger.kernel.org
To: Vincent Tondellier <tondellier+ml.nfdev@dosisoft.fr>
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Vincent Tondellier <tondellier+ml.nfdev@dosisoft.fr> wrote:
> sysctl -w net.ipv4.ip_forward=1
> sysctl -w net.netfilter.nf_conntrack_helper=0
> sysctl -w net.netfilter.nf_conntrack_acct=1
> 
> And try to connect the pptp client. Instant oops.

Q: does it not oops with _acct=0?

If that fixes it, and you have lockdep enabled in kernel
config -- can you check if

commit 223b02d923ecd7c84cf9780bb3686f455d279279
netfilter: nf_conntrack: reserve two bytes for nf_ct_ext->len

helps?