Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758350AbYGFQ7o (ORCPT ); Sun, 6 Jul 2008 12:59:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756862AbYGFQ7f (ORCPT ); Sun, 6 Jul 2008 12:59:35 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:53177 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754865AbYGFQ7e (ORCPT ); Sun, 6 Jul 2008 12:59:34 -0400 Date: Sun, 6 Jul 2008 18:58:10 +0200 From: Ingo Molnar To: Linus Torvalds Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Adrian Bunk , Andrew Morton , Natalie Protasevich , Kernel Testers List , Maximilian Engelhardt , Randy Dunlap , "Paul E. McKenney" , James Bottomley Subject: Re: 2.6.26-rc9: Reported regressions from 2.6.25 Message-ID: <20080706165810.GA16189@elte.hu> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 Content-Length: 1853 Lines: 42 * Linus Torvalds wrote: > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=10815 > > Subject : 2.6.26-rc4: RIP find_pid_ns+0x6b/0xa0 > > Submitter : Alexey Dobriyan > > Date : 2008-05-27 09:23 (41 days old) > > References : http://lkml.org/lkml/2008/5/27/9 > > http://lkml.org/lkml/2008/6/14/87 > > Handled-By : Oleg Nesterov > > Linus Torvalds > > Paul E. McKenney > > Patch : http://lkml.org/lkml/2008/5/28/16 > > This one is the same thing that is reported as unresolved, and no, I > don't think that existing patch was ever really tested to fix > anything. Paul? > > I suspect SRCU will need to be simply marked BROKEN for now, because > nobody knows what the problem Alexey sees is. Apparently it's been > seen by a few other people too. I'm not sure it's directly related to SRCU - it can change timings and freeing patterns enough to tickle other bugs. Since Alexey Dobriyan has reported it - are perhaps namespaces in use during this stress-test? Maybe it's some namespaces related bug that is more easily reproduced under SRCU - namespaces is not a commonly tested feature. Also, i've been running rcutorture stress-tests on a number of test-systems ever since this got reported (and they are running currently as well) and cannot see it - neither could Paul reproduce it. ( and Paul is very good in producing RCU related problems - he's triggered and fixed many RCU related problems that no-one else saw before. ) Ingo -- 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/