netdev - Re: BUG in skb_dequeue (skb->next is NULL)

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Date:	Wed, 01 Dec 2010 11:34:36 +0100
From:	Simon Schubert <2@...c.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: BUG in skb_dequeue (skb->next is NULL)

On 12/01/2010 11:28 AM, Eric Dumazet wrote:
> Le mercredi 01 décembre 2010 à 09:02 +0000, Simon Schubert a écrit :
>> Frédéric L. W. Meunier <2 <at> pervalidus.net> writes:
> 
> CC netdev
>> RIP: 0010:[<ffffffff81459069>]  [<ffffffff81459069>] skb_dequeue+0x59/0x90
>> Call Trace:
>>  [<ffffffff814ef0fa>] unix_stream_recvmsg+0x1aa/0x790
>>  [<ffffffff8145124d>] sock_recvmsg+0xfd/0x130
>>  [<ffffffff81155fd0>] ? pollwake+0x0/0x60
>>  [<ffffffff81452b54>] __sys_recvmsg+0x144/0x2e0
>>  [<ffffffff81155fd0>] ? pollwake+0x0/0x60
>>  [<ffffffff8104d88a>] ? finish_task_switch+0x4a/0xd0
>>  [<ffffffff8154fa91>] ? schedule+0x411/0xa50
>>  [<ffffffff81452f99>] sys_recvmsg+0x49/0x80
>>  [<ffffffff8100b0b2>] system_call_fastpath+0x16/0x1b
> 
> Is it reproductible ?

I can't trigger it on purpose, but it happened two nights in a row (I
don't have the previous backtrace though)

> On previous kernel (say 2.6.35) you never hit this bug ?

No.

cheers
  simon


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