From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ea0-f171.google.com (mail-ea0-f171.google.com [209.85.215.171]) by kanga.kvack.org (Postfix) with ESMTP id 6EF496B0035 for ; Tue, 4 Feb 2014 02:17:20 -0500 (EST) Received: by mail-ea0-f171.google.com with SMTP id f15so4124021eak.2 for ; Mon, 03 Feb 2014 23:17:19 -0800 (PST) Received: from ofcsgdbm.dwd.de (ofcsgdbm.dwd.de. [141.38.3.245]) by mx.google.com with ESMTP id w5si18472359eef.172.2014.02.03.23.17.18 for ; Mon, 03 Feb 2014 23:17:19 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by ofcsgdn3.dwd.de (Postfix) with ESMTP id AA58953E64 for ; Tue, 4 Feb 2014 07:17:18 +0000 (UTC) Received: from ofcsgdn3.dwd.de ([127.0.0.1]) by localhost (ofcsgdn3.csg.lan [127.0.0.1]) (amavisd-new, port 10024) with LMTP id YShJR67qoOk7 for ; Tue, 4 Feb 2014 07:17:18 +0000 (UTC) Date: Tue, 4 Feb 2014 07:17:18 +0000 (GMT) From: Holger Kiehl Subject: Re: Need help in bug in isolate_migratepages_range In-Reply-To: Message-ID: References: <20140203122052.GC2495@dhcp22.suse.cz> <20140203162036.GJ2495@dhcp22.suse.cz> <52EFC93D.3030106@suse.cz> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: owner-linux-mm@kvack.org List-ID: To: David Rientjes Cc: Vlastimil Babka , Michal Hocko , linux-kernel , Mel Gorman , linux-mm@kvack.org On Mon, 3 Feb 2014, David Rientjes wrote: > On Mon, 3 Feb 2014, Vlastimil Babka wrote: > >> It seems to come from balloon_page_movable() and its test page_count(page) == >> 1. >> > > Hmm, I think it might be because compound_head() == NULL here. Holger, > this looks like a race condition when allocating a compound page, did you > only see it once or is it actually reproducible? > No, this only happened once. It is not reproducable, the system was running for four days without problems. And before this kernel, five years without any problems. Thanks, Holger -- 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/ . Don't email: email@kvack.org