From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: [Bridge] Bug#625914: linux-image-2.6.38-2-amd64: bridging is not interacting well with multicast in 2.6.38-4 Date: Thu, 12 May 2011 16:28:10 -0700 Message-ID: <20110512162810.34b8d55a@nehalam> References: <20110510180540.GI6397@morgul.net> <20110510151100.52a9f8fa@nehalam> <20110510233540.GJ6397@morgul.net> <20110512.155916.115945119.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: noahm@debian.org, ben@decadent.org.uk, 625914@bugs.debian.org, bridge@lists.linux-foundation.org, netdev@vger.kernel.org To: David Miller Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:46138 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757801Ab1ELX3L (ORCPT ); Thu, 12 May 2011 19:29:11 -0400 In-Reply-To: <20110512.155916.115945119.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-ID: On Thu, 12 May 2011 15:59:16 -0700 (PDT) David Miller wrote: > From: Noah Meyerhans > 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. > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html 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. --