From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753238AbaKJQKG (ORCPT ); Mon, 10 Nov 2014 11:10:06 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:19388 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752157AbaKJQKD (ORCPT ); Mon, 10 Nov 2014 11:10:03 -0500 Message-ID: <5460E339.5020308@oracle.com> Date: Mon, 10 Nov 2014 11:09:29 -0500 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: Peter Zijlstra CC: Kirill Tkhai , linux-kernel@vger.kernel.org, Oleg Nesterov , Ingo Molnar , Vladimir Davydov , Kirill Tkhai Subject: Re: [PATCH v4] sched/numa: fix unsafe get_task_struct() in task_numa_assign() References: <1413962231.19914.130.camel@tkhai> <545D928B.2070508@oracle.com> <20141110160320.GA10501@worktop.programming.kicks-ass.net> In-Reply-To: <20141110160320.GA10501@worktop.programming.kicks-ass.net> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Source-IP: ucsinet22.oracle.com [156.151.31.94] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/10/2014 11:03 AM, Peter Zijlstra wrote: > On Fri, Nov 07, 2014 at 10:48:27PM -0500, Sasha Levin wrote: >> [ 829.539183] BUG: spinlock recursion on CPU#10, trinity-c594/11067 >> [ 829.539203] lock: 0xffff880631dd6b80, .magic: dead4ead, .owner: trinity-c594/11067, .owner_cpu: 13 > > Ooh, look at that. CPU#10 vs .owner_cpu: 13 on the _same_ task. > > One of those again :/ Hum. I missed that one. Hold on, but the magic here is fine and the owner pointer is fine, why would just the owner cpu be wrong? Thanks, Sasha