From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with ESMTP id 5F49C8D0039 for ; Thu, 17 Feb 2011 11:35:45 -0500 (EST) Date: Thu, 17 Feb 2011 17:35:31 +0100 From: Ingo Molnar 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: Sender: owner-linux-mm@kvack.org List-ID: To: Linus Torvalds , "Eric W. Biederman" Cc: Michal Hocko , linux-mm@kvack.org, LKML * 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org