Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932541AbaLBRRO (ORCPT ); Tue, 2 Dec 2014 12:17:14 -0500 Received: from e31.co.us.ibm.com ([32.97.110.149]:44840 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753306AbaLBRRN (ORCPT ); Tue, 2 Dec 2014 12:17:13 -0500 Date: Tue, 2 Dec 2014 09:17:04 -0800 From: "Paul E. McKenney" To: =?iso-8859-1?Q?D=E2niel?= Fraga Cc: Lai Jiangshan , Linus Torvalds , Linux Kernel Mailing List Subject: Re: frequent lockups in 3.18rc4 Message-ID: <20141202171704.GA27174@linux.vnet.ibm.com> Reply-To: paulmck@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> <547D7B05.6080403@cn.fujitsu.com> <547defc3.28568c0a.73eb.1a1e@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: <547defc3.28568c0a.73eb.1a1e@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: 14120217-8236-0000-0000-000007649BBD Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 02, 2014 at 02:58:38PM -0200, D?niel Fraga wrote: > On Tue, 2 Dec 2014 16:40:37 +0800 > Lai Jiangshan wrote: > > > It is needed at lest for testing. > > > > CONFIG_TREE_PREEMPT_RCU=y with CONFIG_PREEMPT=n is needed for testing too. > > > > Please enable them (or enable them under CONFIG_RCU_TRACE=y) > > Lai, sorry but I didn't understand. Do you mean both of them > enabled? Because how can CONFIG_TREE_PREEMPT_RCU be enabled without > CONFIG_PREEMPT ? Hmmm... I did misread that in my reply. A similar Kconfig edit will enable that, but I am even less happy about the thought of pushing that to mainline! ;-) Thanx, Paul > If you mean both enabled, I already reported a call trace with > both enabled: > > https://bugzilla.kernel.org/show_bug.cgi?id=85941 > > Please see my previous answer to Linus and Paul too. > > Regarding CONFIG_RCU_TRACE, do you mean > "CONFIG_TREE_RCU_TRACE"? I couldn't find CONFIG_RCU_TRACE. > > Thanks. > > -- > 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/