From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758304AbZCSQa3 (ORCPT ); Thu, 19 Mar 2009 12:30:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752517AbZCSQaN (ORCPT ); Thu, 19 Mar 2009 12:30:13 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:56870 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753043AbZCSQaL (ORCPT ); Thu, 19 Mar 2009 12:30:11 -0400 Date: Thu, 19 Mar 2009 17:29:42 +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: <20090319162942.GA21672@elte.hu> References: <200903191522.21045.rusty@rustcorp.com.au> <200903192310.52314.rusty@rustcorp.com.au> <20090319132426.GA27017@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090319132426.GA27017@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=3.2.5 -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: > > 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. Ingo