netdev - Re: Possible networking regression in 3.6.0

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Message-ID: <1349121884.12401.721.camel@edumazet-glaptop>
Date:	Mon, 01 Oct 2012 22:04:44 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	davej@...hat.com, chris2553@...glemail.com, netdev@...r.kernel.org,
	gpiez@....de
Subject: Re: Possible networking regression in 3.6.0

On Mon, 2012-10-01 at 16:01 -0400, David Miller wrote:
> From: Dave Jones <davej@...hat.com>
> Date: Mon, 1 Oct 2012 15:34:34 -0400
> 
> > On Mon, Oct 01, 2012 at 11:15:50AM +0200, Eric Dumazet wrote:
> >  > > 
> >  > > $ netstat -s
> >  > > Icmp:
> >  > >      4 ICMP messages received
> >  > >      4 input ICMP message failed.
> >  > >      ICMP input histogram:
> >  > >          echo replies: 4
> >  > 
> >  > So icmp replies come back and are delivered to host instead of being
> >  > forwarded.
> >  > 
> >  > I wonder if MASQUERADE broke...
> > 
> > I hit something that sounds just like this a few months back..
> > http://lists.openwall.net/netdev/2012/07/25/53
> > 
> > It "went away" a few builds later, but I've seen it happen
> > again from time to time.
> 
> Yep I remembe that report.
> 
> If you can find a way to more reliably trigger the case, that would
> help us immensely.

I am building a KMEMCHECK kernel, as a last try before my night ;)



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