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

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Message-ID: <4A4C95FC.7040305@anarazel.de>
Date:	Thu, 02 Jul 2009 13:11:56 +0200
From:	Andres Freund <andres@...razel.de>
To:	Jarek Poplawski <jarkao2@...il.com>
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 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.

Andres


View attachment "dump_no_orphan_no_mmap.log" of type "text/plain" (7665 bytes)