Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756646Ab0BBQq4 (ORCPT ); Tue, 2 Feb 2010 11:46:56 -0500 Received: from dallas.jonmasters.org ([72.29.103.172]:58986 "EHLO dallas.jonmasters.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751475Ab0BBQqy (ORCPT ); Tue, 2 Feb 2010 11:46:54 -0500 Subject: Re: [PATCH] netfilter: per netns nf_conntrack_cachep From: Jon Masters To: Eric Dumazet Cc: Alexey Dobriyan , Patrick McHardy , linux-kernel , netdev , netfilter-devel , "Paul E. McKenney" In-Reply-To: <1265110504.2861.135.camel@tonnant> References: <1264813832.2793.446.camel@tonnant> <1264816634.2793.505.camel@tonnant> <1264816777.2793.510.camel@tonnant> <1264834704.2919.3.camel@edumazet-laptop> <1265016745.7499.144.camel@tonnant> <1265019160.2848.14.camel@edumazet-laptop> <1265023437.2848.30.camel@edumazet-laptop> <1265035970.2848.50.camel@edumazet-laptop> <1265036548.2848.55.camel@edumazet-laptop> <1265108690.2861.118.camel@tonnant> <1265110504.2861.135.camel@tonnant> Content-Type: text/plain Organization: World Organi[sz]ation of Broken Dreams Date: Tue, 02 Feb 2010 11:46:32 -0500 Message-Id: <1265129192.2861.141.camel@tonnant> Mime-Version: 1.0 X-Mailer: Evolution 2.26.3 (2.26.3-1.fc11) Content-Transfer-Encoding: 7bit X-SA-Do-Not-Run: Yes X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Mail-From: jonathan@jonmasters.org X-SA-Exim-Scanned: No (on dallas.jonmasters.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 898 Lines: 23 On Tue, 2010-02-02 at 06:35 -0500, Jon Masters wrote: > I think there's something more fundamental going on here. What happens is the conntrack code attempts to free nf_conntrack_untracked back into the SL[U]B cache from which it allocates other ct's. There's just one problem...that's a static struct not from the cache. So, this is why we end up with the SLAB being corrupted and the address immediately following the nf_conntrack_untracked being corrupted. I shoved some debug comments into the destroy code to see if we were trying to free nf_conntrack_untracked, and bingo. I have shoved a panic in there now, will send you a backtrace. Jon. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/