Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933389AbaLBWfm (ORCPT ); Tue, 2 Dec 2014 17:35:42 -0500 Received: from e33.co.us.ibm.com ([32.97.110.151]:39430 "EHLO e33.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933065AbaLBWfk (ORCPT ); Tue, 2 Dec 2014 17:35:40 -0500 Date: Tue, 2 Dec 2014 14:35:34 -0800 From: "Paul E. McKenney" To: =?iso-8859-1?Q?D=E2niel?= Fraga Cc: Linus Torvalds , Linux Kernel Mailing List Subject: Re: frequent lockups in 3.18rc4 Message-ID: <20141202223534.GA25340@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20141202170407.GK25340@linux.vnet.ibm.com> <547df364.236a8c0a.7b2d.ffffac67@mx.google.com> <20141202184202.GM25340@linux.vnet.ibm.com> <547e0947.c332e00a.23bf.ffffa8bd@mx.google.com> <20141202191143.GN25340@linux.vnet.ibm.com> <547e11fa.8778e00a.3439.ffffa88c@mx.google.com> <20141202205636.GQ25340@linux.vnet.ibm.com> <547e36d1.c54ae00a.2571.fffffd13@mx.google.com> <20141202221031.GX25340@linux.vnet.ibm.com> <547e3aca.0ca5e00a.3c72.68f6@mx.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <547e3aca.0ca5e00a.3c72.68f6@mx.google.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14120222-0009-0000-0000-000006CB7863 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 02, 2014 at 08:18:46PM -0200, D?niel Fraga wrote: > On Tue, 2 Dec 2014 14:10:31 -0800 > "Paul E. McKenney" wrote: > > > Thank you!!! > > ;) > > > Was this as difficult to trigger as the version with the Kconfig hack > > that used CONFIG_PREEMPT=y and CONFIG_TREE_PREEMPT_RCU=n? > > Yes. I had to try many times until I got the call trace. > > I'll try the bisect as Linus suggested, but if you have any > other suggestions, just ask ;). Thanks Paul. Sounds good to me -- getting a single commit somewhere between 3.16 and 3.17 is going to be a lot better than reasoning indirectly from some set of RCU read-side critical sections. ;-) Thanx, Paul -- 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/