netdev - Re: Kernel crash after using new Intel NIC (igb)

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Date:	Fri, 27 May 2011 09:56:44 +0200
From:	Yann Dupont <Yann.Dupont@...v-nantes.fr>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Arun Sharma <asharma@...com>, David Miller <davem@...emloft.net>,
	Maximilian Engelhardt <maxi@...monizer.de>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	StuStaNet Vorstand <vorstand@...sta.mhn.de>,
	Denys Fedoryshchenko <denys@...p.net.lb>
Subject: Re: Kernel crash after using new Intel NIC (igb)

Le 27/05/2011 05:27, Eric Dumazet a écrit :
> Le jeudi 26 mai 2011 à 17:09 -0700, Arun Sharma a écrit :
>> On 5/26/11 3:01 PM, Eric Dumazet wrote:
>>
>>
>>>> Yeah - using the refcnt seems better than list_empty(), but I'm not sure
>>>> that your patch addresses the race above.
>>> It does.
>> True. I can't find any holes in this method and it resolves the "failure
>> to unlink from unused" case.
>>
>> Perhaps wrap the while(1) loop into its own primitive in atomic.h or use
>> an existing primitive?
>>
> Sure, here is a formal submission I cooked.
>
> Thanks
>
> [PATCH] inetpeer: fix race in unused_list manipulations

Thanks eric, didn't noticed this thread, nice to see you squashed this bug.
As you said in a previous message, slub_nomerge prevented us from 
crashing for 113 days now :)

But of course, THE REAL FIX is much preffered. Will try this patch with 
the next -stable update.

Thanks for your efforts,

-- 
Yann Dupont - Service IRTS, DSI Université de Nantes
Tel : 02.53.48.49.20 - Mail/Jabber : Yann.Dupont@...v-nantes.fr

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