netdev - Re: Problems with /proc/net/tcp6 - possible bug

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Message-Id: <20110124.143141.104045281.davem@davemloft.net>
Date:	Mon, 24 Jan 2011 14:31:41 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	runningdoglackey@...oo.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: Problems with /proc/net/tcp6 - possible bug - ipv6

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 22 Jan 2011 22:40:44 +0100

> Le samedi 22 janvier 2011 à 22:20 +0100, Eric Dumazet a écrit :
>> Le samedi 22 janvier 2011 à 11:42 -0800, PK a écrit :
>> > Eric Dumazet wrote:
>> > > 
>> > > I had some incidents, after hours of testing...
>> > >
>> > > After following patch, I could not reproduce it.
>> > 
>> > 
>> > Looks like that patch solved the /proc/net/tcp6 problem.  The causal commit was 
>> > the one you identified... confirmed with bisect.
>> > 
>> > These warnings show up when I run the script (or I presume any tcp6 connection 
>> > flooder) with /proc/sys/net/tcp/ipv4/tcp_tw_recycle enabled.  There's textual 
>> > corruption of the traces a lot of the time.  Here's a sample trace that doesn't 
>> > appear to be corrupt.  All the warnings I've seen are from route.c:209, and I 
>> > don't see how that would cause memory corruption.
>> 
>> Thats a different isse, already reported, under investigation.
>> 
>> David did some changes recently
>> 
>> http://comments.gmane.org/gmane.linux.network/179874
>> 
>> 
>> 
> 
> In my testings, I even have crashes in cleanup_once() if I
> enable /proc/sys/net/ipv4/tcp_tw_recycle 

I'm looking into this, thanks guys.
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