Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759563AbYBSHjQ (ORCPT ); Tue, 19 Feb 2008 02:39:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762396AbYBSHin (ORCPT ); Tue, 19 Feb 2008 02:38:43 -0500 Received: from rv-out-0910.google.com ([209.85.198.185]:49637 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759059AbYBSHik (ORCPT ); Tue, 19 Feb 2008 02:38:40 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=AIzQtkVscgJ8luE6qBAEGalqkTWvzIn/h5Xea+0glyrdEEjOjHGRWVCpb5JEEQF1Hrj1UzgBBq5nAYmZaftJfzgmrrqvjxdbCcNX2JbHvnAK1ISKL6mjIc7MNdzPXSsVx48Yf277WGxcm95rX6LFJlW3FoM9WC/LAP0InIVf/7A= Message-ID: <84144f020802182338p68d412f6sa9e0f8975344a9c0@mail.gmail.com> Date: Tue, 19 Feb 2008 09:38:40 +0200 From: "Pekka Enberg" To: "Zhang, Yanmin" Subject: Re: NULL pointer in kmem_cache_alloc with 2.6.25-rc1 Cc: "Christoph Lameter" , LKML , "Ingo Molnar" , "Mathieu Desnoyers" , "Linus Torvalds" , "Torsten Kaiser" In-Reply-To: <1203404594.3248.32.camel@ymzhang> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <1203058021.3027.143.camel@ymzhang> <1203404594.3248.32.camel@ymzhang> X-Google-Sender-Auth: f968e3dbb7a1ac6b Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1085 Lines: 25 Hi Yanmin, > On Fri, 2008-02-15 at 08:42 -0800, Christoph Lameter wrote: > > > Kernel panic at line 1637 in file mm/slub.c because object=c->freelist=NULL. > > > > Hmmmm. freelist should never be NULL. Could you rerun the test and boot with > > slub_debug to make sure that there is no memory corruption? On Feb 19, 2008 9:03 AM, Zhang, Yanmin wrote: > 1) Without slub_debug option, sometime I could trigger it, sometimes not. > 2) With slub_debug option, or just enable debug for slab skbuff_fclone_cache > and skbuff_head_cache, I couldn't trigger it. > > I will do more testing and investigation, as the bug also exists in 2.6.25-rc2. Could you please try Ingo's patch: http://lkml.org/lkml/2008/2/19/13 Looks like there are some problems with SLUB_FASTPATH. Pekka -- 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/