From: Bob Copeland Subject: Re: 2.6.32-rc6 BUG at mm/slab.c:2869! Date: Fri, 21 Aug 2009 08:36:57 -0400 Message-ID: <20090821123657.GA27001@hash.localnet> References: <20090820015624.GE524@hash.localnet> <84144f020908192208x453ebbd4gecf52eb47903653d@mail.gmail.com> <20090820111937.GF524@hash.localnet> <19f34abd0908200502n6ff53e71ld5bc18aa581d5625@mail.gmail.com> <20090821020633.GA25571@hash.localnet> <19f34abd0908202346p57de93bew257b046899d7a1da@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Eric Paris , Pekka Enberg , linux-kernel@vger.kernel.org, Andrew Morton , linux-ext4@vger.kernel.org To: Vegard Nossum Return-path: Received: from mail.deathmatch.net ([72.66.92.28]:4412 "EHLO mail.deathmatch.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751682AbZHUMiq (ORCPT ); Fri, 21 Aug 2009 08:38:46 -0400 Content-Disposition: inline In-Reply-To: <19f34abd0908202346p57de93bew257b046899d7a1da@mail.gmail.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Fri, Aug 21, 2009 at 08:46:37AM +0200, Vegard Nossum wrote: > 2009/8/21 Bob Copeland : > > WARNING: kmemcheck: Caught 32-bit read from freed memory (f34a443c) > > eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee008a06f700011000 > > a a a a a a a a a a a a a a a a a a a a a a a a f f f f f f f f > > > > I think that is list_empty() here where %eax is list_head > > and event_list->next is the read location... which definitely > > doesn't look like a pointer, if I'm reading it correctly. > > I think f34a443c is a valid pointer. On my machine, at least: I meant list->next, which was 00100100 here. (By the way, my first time using kmemcheck, very nice tool!) [race condition explanation snipped] > I think that's it. Any thoughts? I put Eric Paris on Cc. Thanks! With a fresh pull containing the fsnotify fix the kmemcheck warning is gone. So unless I see anything else I'll assume that this one is already fixed, sorry for the false alarm. -- Bob Copeland %% www.bobcopeland.com