From: Mingming Cao Subject: Re: 2.6.23-rc9: Oops in cache_alloc_refill() mm/slab.c Date: Fri, 05 Oct 2007 13:30:52 -0700 Message-ID: <1191616252.3861.5.camel@localhost.localdomain> References: <4705113A.7030908@bull.net> <1191534231.6106.99.camel@dyn9047017100.beaverton.ibm.com> <47063EF3.4050302@bull.net> <1191596057.6106.106.camel@dyn9047017100.beaverton.ibm.com> Reply-To: cmm@us.ibm.com Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: Valerie Clement , Linux Kernel Mailing List , ext4 development To: Badari Pulavarty Return-path: Received: from e2.ny.us.ibm.com ([32.97.182.142]:59507 "EHLO e2.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760238AbXJEUbL (ORCPT ); Fri, 5 Oct 2007 16:31:11 -0400 In-Reply-To: <1191596057.6106.106.camel@dyn9047017100.beaverton.ibm.com> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Fri, 2007-10-05 at 07:54 -0700, Badari Pulavarty wrote: > On Fri, 2007-10-05 at 15:41 +0200, Valerie Clement wrote: > > Badari Pulavarty wrote: > > > On Thu, 2007-10-04 at 18:13 +0200, Valerie Clement wrote: > > >> While running ffsb tests on my ext4 filesystem, I got an Oops in > > >> cache_alloc_refill(). > > >> I turned on SLAB debugging and here is the message I got: > > >> > > >> slab: Internal list corruption detected in cache 'buffer_head'(30), > > >> slabp ffff81007e100100(1515870810). Hexdump: > > > > > > slabp->inuse = 1515870810 looks bogus. Is this easily reproducible ? > > > > Hi Badari, > > Thanks for your answer. > > I didn't reproduce it without the latest ext4 patches. So I suspect a > > bug in one of them. > > But how debugging this? > > Which other debug traces can I turn on? > > Let me understand. You applied latest ext4 patchsets ? If so, Mingming > has some slab-cleanup changes in the patchset. You can try backing them > out and see. > It's unlikely to be the jbd_slab_cleanup.patch, which actually get rid of slab allocation for buffers passing down to disk IO, and replace with get_free_page directly. Could you send me the profile used for ffsb test? Thanks, Mingming