From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754951Ab1KCDIS (ORCPT ); Wed, 2 Nov 2011 23:08:18 -0400 Received: from relay3-d.mail.gandi.net ([217.70.183.195]:46146 "EHLO relay3-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754717Ab1KCDIR (ORCPT ); Wed, 2 Nov 2011 23:08:17 -0400 X-Originating-IP: 217.70.178.139 X-Originating-IP: 50.43.15.19 Date: Wed, 2 Nov 2011 20:07:50 -0700 From: Josh Triplett To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com, eric.dumazet@gmail.com, darren@dvhart.com, patches@linaro.org Subject: Re: [PATCH RFC tip/core/rcu 09/28] rcu: Document failing tick as cause of RCU CPU stall warning Message-ID: <20111103030750.GB2042@leaf> References: <20111102203017.GA3830@linux.vnet.ibm.com> <1320265849-5744-9-git-send-email-paulmck@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1320265849-5744-9-git-send-email-paulmck@linux.vnet.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 02, 2011 at 01:30:30PM -0700, Paul E. McKenney wrote: > One of lclaudio's systems was seeing RCU CPU stall warnings from idle. > These turned out to be caused by a bug that stopped scheduling-clock > tick interrupts from being sent to a given CPU for several hundred seconds. Out of curiosity, what caused this bug? - Josh Triplett