From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f51.google.com (mail-wm0-f51.google.com [74.125.82.51]) by kanga.kvack.org (Postfix) with ESMTP id 02F056B0038 for ; Mon, 14 Dec 2015 05:05:59 -0500 (EST) Received: by mail-wm0-f51.google.com with SMTP id n186so37683110wmn.0 for ; Mon, 14 Dec 2015 02:05:58 -0800 (PST) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id n126si24404052wmf.19.2015.12.14.02.05.57 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 14 Dec 2015 02:05:57 -0800 (PST) Date: Mon, 14 Dec 2015 11:05:56 +0100 From: Michal Hocko Subject: Re: mm related crash Message-ID: <20151214100556.GB4540@dhcp22.suse.cz> References: <20151210154801.GA12007@lahna.fi.intel.com> <20151214092433.GA90449@black.fi.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151214092433.GA90449@black.fi.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: Mika Westerberg , Hugh Dickins , linux-mm@kvack.org On Mon 14-12-15 11:24:33, Kirill A. Shutemov wrote: > On Thu, Dec 10, 2015 at 05:48:01PM +0200, Mika Westerberg wrote: > > Hi Kirill, > > > > I got following crash on my desktop machine while building swift. It > > reproduces pretty easily on 4.4-rc4. > > > > Before it happens the ld process is killed by OOM killer. I attached the > > whole dmesg. > > > > [ 254.740603] page:ffffea00111c31c0 count:2 mapcount:0 mapping: (null) index:0x0 > > [ 254.740636] flags: 0x5fff8000048028(uptodate|lru|swapcache|swapbacked) > > [ 254.740655] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) > > [ 254.740679] ------------[ cut here ]------------ > > [ 254.740690] kernel BUG at mm/memcontrol.c:5270! > > > Hm. I don't see how this can happen. What a coincidence. I have just posted a similar report: http://lkml.kernel.org/r/20151214100156.GA4540@dhcp22.suse.cz except I have hit the VM_BUG_ON from a different path. My suspicion is that somebody unlocks the page while we are waiting on the writeback. I am trying to reproduce this now. -- Michal Hocko SUSE Labs -- 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