From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Westphal <fw@strlen.de>
Subject: Re: linux-next: kernel panic in ipv6_defrag
Date: Wed, 23 Dec 2015 09:59:47 +0100
Message-ID: <20151223085947.GD9692@breakpoint.cc>
References: <567A0DCD.3060001@oracle.com>
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Cc: netdev@vger.kernel.org, davem@davemloft.net,
	linux-next@vger.kernel.org,
	Linux Kernel mailing list <linux-kernel@vger.kernel.org>
To: Junxiao Bi <junxiao.bi@oracle.com>
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Junxiao Bi <junxiao.bi@oracle.com> wrote:
> The following panic happened when I run ocfs2-test on linux-next. Kernel
> config is attached.
> 
> [64910.905501] BUG: unable to handle kernel NULL pointer dereference at
>           (null)
> [64910.906466] IP: [<ffffffff8183cc8d>] nf_ct_frag6_gather+0x7ad/0x9c0
[..]
> ocfs2_stack_o2cb(O) ocfs2_dlm(O) ocfs2_nodemanager(O) ocfs2_stackglue(O)
> iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi xen_kbdfront
> xen_netfront xen_fbfront xen_blkfront [last unloaded: ocfs2_stackglue]
> [64910.906466] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G           O
> 4.4.0-rc5-next-20151217 #1

Seems like this snapshot still lacks

e97ac12859dbf4d3ee0eddb9798867541d1d1e1e
("netfilter: ipv6: nf_defrag: fix NULL deref panic"),
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/net/ipv6/netfilter/nf_conntrack_reasm.c?id=e97ac12859dbf4d3ee0eddb9798867541d1d1e1e

Its included starting with next-20151221.

Please report back if it occurs with above commit present.

Thanks.