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

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Message-ID: <1295732444.2651.68.camel@edumazet-laptop>
Date:	Sat, 22 Jan 2011 22:40:44 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	PK <runningdoglackey@...oo.com>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: Problems with /proc/net/tcp6  - possible bug - ipv6

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 



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