From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753719AbaCKBjr (ORCPT ); Mon, 10 Mar 2014 21:39:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55222 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753390AbaCKBjp (ORCPT ); Mon, 10 Mar 2014 21:39:45 -0400 Date: Mon, 10 Mar 2014 20:39:54 -0400 From: Dave Jones To: Joonsoo Kim Cc: Christoph Lameter , Linux Kernel , Pekka Enberg , linux-mm@kvack.org, David Rientjes , Al Viro Subject: Re: oops in slab/leaks_show Message-ID: <20140311003954.GA4798@redhat.com> Mail-Followup-To: Dave Jones , Joonsoo Kim , Christoph Lameter , Linux Kernel , Pekka Enberg , linux-mm@kvack.org, David Rientjes , Al Viro References: <20140307025703.GA30770@redhat.com> <20140311003459.GA25657@lge.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140311003459.GA25657@lge.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 11, 2014 at 09:35:00AM +0900, Joonsoo Kim wrote: > On Fri, Mar 07, 2014 at 11:18:30AM -0600, Christoph Lameter wrote: > > Joonsoo recently changed the handling of the freelist in SLAB. CCing him. > > > > On Thu, 6 Mar 2014, Dave Jones wrote: > > > > > I pretty much always use SLUB for my fuzzing boxes, but thought I'd give SLAB a try > > > for a change.. It blew up when something tried to read /proc/slab_allocators > > > (Just cat it, and you should see the oops below) > > Hello, Dave. > > Today, I did a test on v3.13 which contains all my changes on the handling of > the freelist in SLAB and couldn't trigger oops by just 'cat /proc/slab_allocators'. > > So I look at the code and find that there is race window if there is multiple users > doing 'cat /proc/slab_allocators'. Did your test do that? I could reproduce it with a single cat. Dave