Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756853Ab1BQQfu (ORCPT ); Thu, 17 Feb 2011 11:35:50 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:54760 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755373Ab1BQQfr (ORCPT ); Thu, 17 Feb 2011 11:35:47 -0500 Date: Thu, 17 Feb 2011 17:35:31 +0100 From: Ingo Molnar To: Linus Torvalds , "Eric W. Biederman" Cc: Michal Hocko , linux-mm@kvack.org, LKML Subject: Re: BUG: Bad page map in process udevd (anon_vma: (null)) in 2.6.38-rc4 Message-ID: <20110217163531.GF14168@elte.hu> References: <20110216185234.GA11636@tiehlicka.suse.cz> <20110216193700.GA6377@elte.hu> <20110217090910.GA3781@tiehlicka.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.5 -2.0 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: 1400 Lines: 33 * Linus Torvalds wrote: > And in addition, I don't see why others wouldn't see it (I've got > DEBUG_PAGEALLOC and SLUB_DEBUG_ON turned on myself, and I know others > do too). I've done extensive randconfig testing and no crash triggers for typical workloads on a typical dual-core PC. If there's a generic crashes in there my tests tend to trigger them at least 10x as often as regular testers ;-) But the tests are still only statistical so the race could simply be special and missed by the tests. > So I'm wondering what triggers it. Must be something subtle. I think what Michal did before he got the corruption seemed somewhat atypical: suspend/resume and udevd wifi twiddling, right? Now, Eric's crashes look similar - and he does not seem to have done anything special to trigger the crashes. Eric, could you possibly describe your system in a bit more detail, does it do suspend and does the box use wifi actively? Anything atypical in your setup or usage that doesnt match a bog-standard whitebox PC with LAN? Swap to file? NFS? FUSE? Anything that is even just borderline atypical. Thanks, 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/