Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754608AbaLBROQ (ORCPT ); Tue, 2 Dec 2014 12:14:16 -0500 Received: from mail-qa0-f53.google.com ([209.85.216.53]:33302 "EHLO mail-qa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754199AbaLBROO (ORCPT ); Tue, 2 Dec 2014 12:14:14 -0500 Message-ID: <547df364.236a8c0a.7b2d.ffffac67@mx.google.com> Date: Tue, 2 Dec 2014 15:14:08 -0200 From: =?UTF-8?B?RMOibmllbA==?= Fraga To: "Paul E. McKenney" Cc: Linus Torvalds , Linux Kernel Mailing List Subject: Re: frequent lockups in 3.18rc4 In-Reply-To: <20141202170407.GK25340@linux.vnet.ibm.com> References: <20141127225637.GA24019@redhat.com> <547b8a45.6e608c0a.20f9.1002@mx.google.com> <547bbe36.48548c0a.105c.779c@mx.google.com> <20141201191431.GA17385@linux.vnet.ibm.com> <547ccf74.a5198c0a.25de.26d9@mx.google.com> <20141201230813.GE25340@linux.vnet.ibm.com> <547dec29.c71f8c0a.33d1.11d9@mx.google.com> <20141202170407.GK25340@linux.vnet.ibm.com> Organization: http://www.youtube.com/DanielFragaBR X-Mailer: Claws Mail 3.11.1-9-g1f531c (GTK+ 2.24.25; x86_64-unknown-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2 Dec 2014 09:04:07 -0800 "Paul E. McKenney" wrote: > Is it harder to reproduce with CONFIG_PREEMPT=y and CONFIG_TREE_PREEMPT_RCU=n? Yes, it's much harder! :) > If it is a -lot- harder to reproduce, it might be worth bisecting among > the RCU read-side critical sections. If making a few of them be > non-preemptible greatly reduces the probability of the bug occuring, > that might provide a clue about root cause. > > On the other hand, if it is just a little harder to reproduce, this > RCU read-side bisection would likely be an exercise in futility. Ok, I want to bisect it. Since it could be painful to bisect, could you suggest 2 commits between 3.16.0 and 3.17.0 so we can narrow the bisect? I could just bisect between 3.16.0 and 3.17.0 but it would take many days :). Ps: if you prefer I bisect between 3.16.0 and 3.17.0, no problem, but you'll have to be patient ;). -- Linux 3.17.0-dirty: Shuffling Zombie Juror http://www.youtube.com/DanielFragaBR http://exchangewar.info Bitcoin: 12H6661yoLDUZaYPdah6urZS5WiXwTAUgL -- 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/