From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755908AbaCNQO6 (ORCPT ); Fri, 14 Mar 2014 12:14:58 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:31562 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755076AbaCNQO4 (ORCPT ); Fri, 14 Mar 2014 12:14:56 -0400 Message-ID: <53232AF3.3040300@oracle.com> Date: Fri, 14 Mar 2014 12:14:43 -0400 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Hugh Dickins , Davidlohr Bueso CC: Oleg Nesterov , Andrew Morton , "linux-mm@kvack.org" , Michel Lespinasse , Rik van Riel , Vlastimil Babka , LKML Subject: Re: mm: mmap_sem lock assertion failure in __mlock_vma_pages_range References: <531F6689.60307@oracle.com> <1394568453.2786.28.camel@buesod1.americas.hpqcorp.net> <20140311133051.bf5ca716ef189746ebcff431@linux-foundation.org> <531F75D1.3060909@oracle.com> <1394570844.2786.42.camel@buesod1.americas.hpqcorp.net> <531F79F7.5090201@oracle.com> <1394574323.2786.45.camel@buesod1.americas.hpqcorp.net> <531F8C3A.1040502@oracle.com> <1394737202.2452.8.camel@buesod1.americas.hpqcorp.net> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: ucsinet21.oracle.com [156.151.31.93] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/13/2014 04:57 PM, Hugh Dickins wrote: > On Thu, 13 Mar 2014, Davidlohr Bueso wrote: >> On Tue, 2014-03-11 at 18:20 -0400, Sasha Levin wrote: >>> On 03/11/2014 05:45 PM, Davidlohr Bueso wrote: >>>> On Tue, 2014-03-11 at 17:02 -0400, Sasha Levin wrote: >>>>>> On 03/11/2014 04:47 PM, Davidlohr Bueso wrote: >>>>>>>>>> Bingo! With the above patch: >>>>>>>>>>>> >>>>>>>>>>>> [ 243.565794] kernel BUG at mm/vmacache.c:76! >>>>>>>>>>>> [ 243.566720] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC >>>>>>>>>>>> [ 243.568048] Dumping ftrace buffer: >>>>>>>>>>>> [ 243.568740] (ftrace buffer empty) >>>>>>>>>>>> [ 243.569481] Modules linked in: >>>>>>>>>>>> [ 243.570203] CPU: 10 PID: 10073 Comm: trinity-c332 Tainted: G W 3.14.0-rc5-next-20140307-sasha-00010-g1f812cb-dirty #143 >>>>>>>> and this is also part of the DEBUG_PAGEALLOC + trinity combo! I suspect >>>>>>>> the root cause it the same as Fengguang's report. >>>>>> >>>>>> The BUG still happens without DEBUG_PAGEALLOC. >>>> Any idea what trinity itself is doing? >>>> >>>> Could you add the following, I just want to make sure the bug isn't >>>> being caused by an overflow: >>> >>> Not hitting that WARN. >> >> Sasha, could you please try the following patch: >> https://lkml.org/lkml/2014/3/13/312 > > I was getting the "kernel BUG at mm/vmacache.c:76!" running KSM > on mmotm: Oleg's patch (buildable version below) fixes it for me. Sorry for the delay, some patch in the last -next broke boot and I had to spend a while waiting for the bisect before I could test this patch. The patch fixes the vmacache issues I've been seeing. Thanks, Sasha