From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965955AbcBDLv0 (ORCPT ); Thu, 4 Feb 2016 06:51:26 -0500 Received: from mail-wm0-f51.google.com ([74.125.82.51]:37887 "EHLO mail-wm0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965854AbcBDLvU (ORCPT ); Thu, 4 Feb 2016 06:51:20 -0500 Subject: Re: crash in 3.12.51 (likely in 3.12.52 as well) in timer code To: Mike Galbraith , "Linux-Kernel@Vger. Kernel. Org" References: <56B1DD62.9030900@kyup.com> <1454585550.3407.126.camel@gmail.com> Cc: Jiri Slaby , Oleg Nesterov , tglx@linutronix.de, SiteGround Operations From: Nikolay Borisov Message-ID: <56B33B34.6090508@kyup.com> Date: Thu, 4 Feb 2016 13:51:16 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: <1454585550.3407.126.camel@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02/04/2016 01:32 PM, Mike Galbraith wrote: > On Wed, 2016-02-03 at 12:58 +0200, Nikolay Borisov wrote: >> >> So in this case the prev/next entries do not look like corrupted, whereas >> when manipulating the list inside detach_timer they do. This is really >> odd, any ideas how to further debug this? > > Suspiciously similar to https://lkml.org/lkml/2016/2/4/247 Right, I've been cursory following this thread but I was left with the impression this only occurs on machines where the CPU can go offline, currently the server on which this happened should never offline any of its CPUs since the power management is disabled (though I will have to double check this). On a different note - is there a way to safely reproduce this so I can test the suggested fix by Thomas? > > -Mike >