From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754204AbaD2FVO (ORCPT ); Tue, 29 Apr 2014 01:21:14 -0400 Received: from mail-ee0-f52.google.com ([74.125.83.52]:58439 "EHLO mail-ee0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750848AbaD2FVM (ORCPT ); Tue, 29 Apr 2014 01:21:12 -0400 Message-ID: <1398748869.5514.81.camel@marge.simpson.net> Subject: Re: [ANNOUNCE] 3.14-rt1 From: Mike Galbraith To: Steven Rostedt Cc: Nicholas Mc Guire , Sebastian Andrzej Siewior , linux-rt-users , LKML , Thomas Gleixner , John Kacur Date: Tue, 29 Apr 2014 07:21:09 +0200 In-Reply-To: <1398695832.14475.10.camel@marge.simpson.net> References: <20140411185739.GA6644@linutronix.de> <1397918766.5436.16.camel@marge.simpson.net> <1398411635.11930.45.camel@marge.simpson.net> <1398501491.12941.5.camel@marge.simpson.net> <1398520699.28726.22.camel@marge.simpson.net> <1398661784.30930.33.camel@marge.simpson.net> <1398676186.30930.49.camel@marge.simpson.net> <20140428101805.75032f45@gandalf.local.home> <1398695832.14475.10.camel@marge.simpson.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2014-04-28 at 16:37 +0200, Mike Galbraith wrote: > > Seems that migrate_disable() must be called before taking the lock as > > it is done in every other location. > > And for tasklist_lock, seems you also MUST do that prior to trylock as > well, else you'll run afoul of the hotplug beast. Bah. Futzing with dmesg while stress script is running is either a very bad idea, or a very good test. Both virgin 3.10-rt and 3.12-rt with new bugs squashed will deadlock. Too bad I kept on testing, I liked the notion that hotplug was solid ;-) -Mike