Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755581AbYBSHHd (ORCPT ); Tue, 19 Feb 2008 02:07:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761067AbYBSHGy (ORCPT ); Tue, 19 Feb 2008 02:06:54 -0500 Received: from mga10.intel.com ([192.55.52.92]:29894 "EHLO fmsmga102.fm.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1760914AbYBSHGx (ORCPT ); Tue, 19 Feb 2008 02:06:53 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.25,375,1199692800"; d="scan'208";a="299772692" Subject: Re: NULL pointer in kmem_cache_alloc with 2.6.25-rc1 From: "Zhang, Yanmin" To: Christoph Lameter Cc: LKML In-Reply-To: References: <1203058021.3027.143.camel@ymzhang> Content-Type: text/plain; charset=utf-8 Date: Tue, 19 Feb 2008 15:03:14 +0800 Message-Id: <1203404594.3248.32.camel@ymzhang> Mime-Version: 1.0 X-Mailer: Evolution 2.9.2 (2.9.2-2.fc7) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 973 Lines: 25 On Fri, 2008-02-15 at 08:42 -0800, Christoph Lameter wrote: > On Fri, 15 Feb 2008, Zhang, Yanmin wrote: > > > On my 16-core tigerton, kernel panic when I ran hackbench process testing. See > > below log. > > > > > 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? 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. -yanmin -- 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/