Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752760AbaBDHR3 (ORCPT ); Tue, 4 Feb 2014 02:17:29 -0500 Received: from ofcsgdbm.dwd.de ([141.38.3.245]:53929 "EHLO ofcsgdbm.dwd.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751234AbaBDHRT (ORCPT ); Tue, 4 Feb 2014 02:17:19 -0500 Date: Tue, 4 Feb 2014 07:17:18 +0000 (GMT) From: Holger Kiehl X-X-Sender: kiehl@diagnostix.dwd.de To: David Rientjes cc: Vlastimil Babka , Michal Hocko , linux-kernel , Mel Gorman , linux-mm@kvack.org 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> User-Agent: Alpine 2.02 (LRH 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.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 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/