From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755288Ab1JSHwl (ORCPT ); Wed, 19 Oct 2011 03:52:41 -0400 Received: from mail-ww0-f44.google.com ([74.125.82.44]:36922 "EHLO mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751870Ab1JSHwj (ORCPT ); Wed, 19 Oct 2011 03:52:39 -0400 Message-ID: <1319010739.18562.6.camel@edumazet-laptop> Subject: Re: PROBLEM: System call 'sendmsg' of process ospfd (quagga) causes kernel oops From: Eric Dumazet To: David Miller Cc: herbert@gondor.hengli.com.au, evonlanthen@gmail.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, timo.teras@iki.fi Date: Wed, 19 Oct 2011 09:52:19 +0200 In-Reply-To: <20111019.033052.851679720607111734.davem@davemloft.net> References: <20111018134537.GA17055@gondor.apana.org.au> <20111019.030914.218521668377472155.davem@davemloft.net> <1319008713.17914.8.camel@edumazet-laptop> <20111019.033052.851679720607111734.davem@davemloft.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.0- Content-Transfer-Encoding: 8bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le mercredi 19 octobre 2011 à 03:30 -0400, David Miller a écrit : > From: Eric Dumazet > Date: Wed, 19 Oct 2011 09:18:33 +0200 > > > Seems fine (Maybe do the +15 in caller site ?), but we also have other > > problematic cases, using alloc_skb() only... > > Ok, which ones operate over these problematic GRE tunnels? > I was more thinking of general idea to allow any device to change its needed headroom. For GRE tunnels, I dont think IPv6 fragmentation could be relevant, but maybe IGMP could trigger a problem ?