From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758795AbZCTRss (ORCPT ); Fri, 20 Mar 2009 13:48:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757352AbZCTRsj (ORCPT ); Fri, 20 Mar 2009 13:48:39 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:58267 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756752AbZCTRsh (ORCPT ); Fri, 20 Mar 2009 13:48:37 -0400 Date: Fri, 20 Mar 2009 18:48:01 +0100 From: Ingo Molnar To: Rusty Russell , Jeremy Fitzhardinge , Andrew Morton Cc: Steven Rostedt , LKML , Peter Zijlstra Subject: Re: [PATCH] cpumask: remove cpumask allocation from idle_balance Message-ID: <20090320174801.GA7341@elte.hu> References: <200903191522.21045.rusty@rustcorp.com.au> <200903192310.52314.rusty@rustcorp.com.au> <20090319132426.GA27017@elte.hu> <20090319162942.GA21672@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090319162942.GA21672@elte.hu> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Ingo Molnar wrote: > > * Ingo Molnar wrote: > > > > This time for sure, > > > > not so sure: > > > > [ 4.303068] ============================================================================= > > [ 4.303332] BUG idr_layer_cache: Redzone overwritten > > [ 4.303332] ----------------------------------------------------------------------------- > > [ 4.303332] > > [ 4.303332] INFO: 0xffff88003f838958-0xffff88003f83895f. First byte 0xa1 instead of 0xbb > > [ 4.303332] INFO: Allocated in 0xffff88003f9b94b0 age=4294878587 cpu=2 pid=0 > > [ 4.303332] INFO: Freed in 0xffff88003f8389f0 age=18446744073709463001 cpu=4294967295 pid=0 > > [ 4.303332] INFO: Slab 0xffffe200015d5340 objects=13 used=10 fp=0xffff88003f838738 flags=0x40000000000020c3 > > [ 4.303332] INFO: Object 0xffff88003f838738 @offset=1848 fp=0x(null) > > hm, i'm seeing this even with the cpus4096 bits removed. > > It _seems_ to trigger when i add these two commits: > > 71ff49d: x86: with the last user gone, remove set_pte_present > b40c757: x86/32: no need to use set_pte_present in set_pte_vaddr > > but i'm not completely sure it's related, i tried a bisection and it > showed heisenbug properties. > > Might have come from upstream, that saw some IDR changes recently. This one has not retriggered - but when i could reproduce it it would trigger about 50% of the time. So there's no real correlation to the cpumask changes (sorry Rusty!). I'd say it's upstream originated, but it's hard to tell without a reliable reproducer. Ingo