netdev - Re: [Bridge] Bug#625914: linux-image-2.6.38-2-amd64: bridging is not interacting well with multicast in 2.6.38-4

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Message-ID: <20110512162810.34b8d55a@nehalam>
Date:	Thu, 12 May 2011 16:28:10 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	noahm@...ian.org, ben@...adent.org.uk, 625914@...s.debian.org,
	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [Bridge] Bug#625914: linux-image-2.6.38-2-amd64: bridging is
 not interacting well with multicast in 2.6.38-4

On Thu, 12 May 2011 15:59:16 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Noah Meyerhans <noahm@...ian.org>
> Date: Tue, 10 May 2011 16:35:40 -0700
> 
> > On Tue, May 10, 2011 at 03:11:00PM -0700, Stephen Hemminger wrote:
> >> There were two more follow on commits in stable related to this.
> >> I recommend merging 2.6.38.6 which includes these.
> > 
> > The problem still exists in the current 2.6.38.6.  Backing out 5f1c356a
> > still solves the problem there.
> > 
> > I have not yet tried anything outside the stable-2.6.38.y tree, but it
> > seems like these same changes are present there, and it's unlikely that
> > other releases will work any better.
> 
> So the issue is that if we back out that change, we get crashes.
> 
> Aparently there is a code path where whatever is existing in the
> SKB ip options block matters, and needs to be maintained.
> 
> Someone needs to audit all of this and figure out how to fix the
> problem properly.
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I suspect tuntap is part of the problem. The skb may not be
allocated with enough padding or something like that. No guarantees
but will do some investigation.


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