netdev - Re: BUG: unable to handle kernel NULL pointer dereference at 000000000000002c

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Message-ID: <CA+5PVA6kZkgYus4698Up8Q8uMTetCU2=DnTD0RpgXuHkJj6KKg@mail.gmail.com>
Date:	Thu, 1 Dec 2011 15:37:01 -0500
From:	Josh Boyer <jwboyer@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Stefan Priebe <s.priebe@...fihost.ag>, netdev@...r.kernel.org,
	Dave Chinner <david@...morbit.com>, stable@...r.kernel.org
Subject: Re: BUG: unable to handle kernel NULL pointer dereference at 000000000000002c

On Thu, Dec 1, 2011 at 3:20 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le jeudi 01 décembre 2011 à 13:23 -0500, Christoph Hellwig a écrit :
>> On Thu, Dec 01, 2011 at 07:11:51PM +0100, Stefan Priebe wrote:
>> > Hi,
>> >
>> > i'm not quite sure if this is an XFS thing or a tcp thing. As the
>> > stacktrace confuses me a little but as it contains
>> > xfs_bmap_search_extents and xfs_iunlock. Kernel is 3.0.11 running as
>> > 2.6.40.11.
>> >
>> > [171464.091567] BUG: unable to handle kernel NULL pointer
>> > dereference at 000000000000002c
>> > [171464.092073] IP: [<ffffffff815494f6>] ipv4_dst_check+0xb6/0x190
>> > [171464.092073] PGD 15344e067 PUD 14c821067 PMD 0
>> > [171464.092073] Oops: 0002 [#1] SMP
>> >
>> > Full Stacktrace:
>> > http://pastebin.com/raw.php?i=QNg6jD2t
>>
>> The ? entries mean even the backtrace code things they are unreliable,
>> and mos of the cases I've seen they are wrong.  In this case it looks
>> like the process was doing XFS work before, but the current system call
>> indeed is purely in the networking code.
>>
>> I've changed the cc list to the netdev list which is more appropinquate.
>
> Probably fixed by commit 81d54ec8479a2c695760da
> (net: fix NULL dereferences in check_peer_redir())

Did you mean f2c31e32b378a665 ?  81d54ec84 is:

udp: remove redundant variable

in Linus' tree.

> But this patch needs some followup patches (some of them in David net
> tree, not yet in Linus tree)

9de79c127cccecb11ae6a21ab1499e87aa222880 (net: fix potential neighbour
race in dst_ifdown()) is in Linus' tree.  Which others are missing?

josh
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