Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752451AbZIJSBA (ORCPT ); Thu, 10 Sep 2009 14:01:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752260AbZIJSBA (ORCPT ); Thu, 10 Sep 2009 14:01:00 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:44939 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752146AbZIJSA7 (ORCPT ); Thu, 10 Sep 2009 14:00:59 -0400 Date: Thu, 10 Sep 2009 20:00:49 +0200 From: Ingo Molnar To: Jens Axboe , Martin Schwidefsky , John Stultz Cc: Peter Zijlstra , Mike Galbraith , Con Kolivas , linux-kernel@vger.kernel.org Subject: [crash, bisected] Re: clocksource: Resolve cpu hotplug dead lock with TSC unstable Message-ID: <20090910180049.GA10579@elte.hu> References: <1252486344.28645.18.camel@marge.simson.net> <20090909091009.GR18599@kernel.dk> <20090909115429.GY18599@kernel.dk> <20090909122006.GA18599@kernel.dk> <1252565738.7205.29.camel@laptop> <20090910065856.GL18599@kernel.dk> <20090910073317.GP18599@kernel.dk> <20090910074902.GA10634@elte.hu> <20090910075357.GT18599@kernel.dk> <20090910100214.GB21314@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090910100214.GB21314@elte.hu> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.5 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1466 Lines: 50 * Ingo Molnar wrote: > > * Jens Axboe wrote: > > > I went to try -tip btw, but it crashes on boot. Here's the > > backtrace, typed manually, it's crashing in > > queue_work_on+0x28/0x60. > > > > Call Trace: > > queue_work > > schedule_work > > clocksource_mark_unstable > > mark_tsc_unstable > > check_tsc_sync_source > > native_cpu_up > > relay_hotcpu_callback > > do_forK_idle > > _cpu_up > > cpu_up > > kernel_init > > kernel_thread_helper > > hm, that looks like an old bug i fixed days ago via: > > 00a3273: Revert "x86: Make tsc=reliable override boot time stability checks" > > Have you tested tip:master - do you still know which sha1? Ok, i reproduced it on a testbox and bisected it, the crash is caused by: 7285dd7fd375763bfb8ab1ac9cf3f1206f503c16 is first bad commit commit 7285dd7fd375763bfb8ab1ac9cf3f1206f503c16 Author: Thomas Gleixner Date: Fri Aug 28 20:25:24 2009 +0200 clocksource: Resolve cpu hotplug dead lock with TSC unstable Martin Schwidefsky analyzed it: I've reverted it in tip/master for now. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/