From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756457Ab3K0OJG (ORCPT ); Wed, 27 Nov 2013 09:09:06 -0500 Received: from cdptpa-outbound-snat.email.rr.com ([107.14.166.225]:12390 "EHLO cdptpa-oedge-vip.email.rr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755540Ab3K0OIu (ORCPT ); Wed, 27 Nov 2013 09:08:50 -0500 Date: Wed, 27 Nov 2013 09:08:45 -0500 From: Steven Rostedt To: Peter Zijlstra Cc: LKML , Ingo Molnar , Preeti U Murthy , svaidy@linux.vnet.ibm.com, vincent.guittot@linaro.org, bitbucket@online.de, benh@kernel.crashing.org, anton@samba.org, Morten.Rasmussen@arm.com, pjt@google.com, mikey@neuling.org, Linus Torvalds Subject: Re: [BUG] in sched fair on v3.13-rc1+ doing hotplug Message-ID: <20131127090845.0d728946@gandalf.local.home> In-Reply-To: <20131127132243.GD10022@twins.programming.kicks-ass.net> References: <20131127081345.0cab8b15@gandalf.local.home> <20131127132243.GD10022@twins.programming.kicks-ass.net> X-Mailer: Claws Mail 3.9.2 (GTK+ 2.24.20; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-RR-Connecting-IP: 107.14.168.130:25 X-Cloudmark-Score: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 27 Nov 2013 14:22:43 +0100 Peter Zijlstra wrote: > On Wed, Nov 27, 2013 at 08:13:45AM -0500, Steven Rostedt wrote: > > atomic_inc(&sd->groups->sgp->nr_busy_cpus); <<---- BUG > > unlock: > > rcu_read_unlock(); > > } > > tip/sched/urgent has this one: > > --- > commit 42eb088ed246a5a817bb45a8b32fe234cf1c0f8b > Author: Peter Zijlstra > Date: Tue Nov 19 16:41:49 2013 +0100 > > sched: Avoid NULL dereference on sd_busy After applying this patch, the bug does go away. Thanks! -- Steve