linux-kernel - Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 (possibly caused by netem)

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Message-ID: <20090702114346.GB7402@ff.dom.local>
Date:	Thu, 2 Jul 2009 11:43:46 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Andres Freund <andres@...razel.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Stephen Hemminger <shemminger@...tta.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 (possibly
	caused by netem)

On Thu, Jul 02, 2009 at 01:11:56PM +0200, Andres Freund wrote:
> On 07/02/2009 12:12 PM, Jarek Poplawski wrote:
>> On Thu, Jul 02, 2009 at 09:30:31AM +0000, Jarek Poplawski wrote:
>>> On Thu, Jul 02, 2009 at 02:37:24AM +0200, Andres Freund wrote:
>>> ...
>>>> So I tried - and I did not catch any lockdep output before the crash.
>>>> Unfortunately I do not have another machine on the same local network to
>>>> catch any messages after the crash... So I could be missing some warning
>>>> (I did synchronous logging though).
>>>> Will check with netconsole tomorrow.
>>>
>>> Could you try if this patch changes anything?
>>
>> ...and maybe CONFIG_PACKET_MMAP turned off.
> Ok. Removed the skb_orphan and turned of CONFIG_PACKET_MMAP. Seemingly  
> the same game.
> I now had another computer to catch the netconsole output. Still no  
> lockdep warnings.
>
> Unfortunately the other computer was a windows machine with its strange  
> terminal, so long lines are wrapped at 80cols, but that shouldn't be too  
> bad.

It's very nice ;-) Alas we can see here only one side, so there is
still some searching needed. I hope I'll be able to reproduce this
later.

Thanks for your work Andres,
Jarek P.
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