From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752442Ab1GTO7n (ORCPT ); Wed, 20 Jul 2011 10:59:43 -0400 Received: from e7.ny.us.ibm.com ([32.97.182.137]:42665 "EHLO e7.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751543Ab1GTO7m (ORCPT ); Wed, 20 Jul 2011 10:59:42 -0400 Date: Wed, 20 Jul 2011 07:59:39 -0700 From: "Paul E. McKenney" To: RKK Cc: kernelmail.jms@gmail.com, linux-kernel@vger.kernel.org, cmm@us.ibm.com Subject: Re: Fw: RCU boot debug patch Message-ID: <20110720145939.GB2352@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20110719224142.GT2357@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 20, 2011 at 10:57:38AM +0530, RKK wrote: > Hi paul, > > On Wed, Jul 20, 2011 at 4:11 AM, Paul E. McKenney > wrote: > > Hello, Julie and Ravi, > > > > Although we arrived at a patch that worked for both of you, we never did > > identify exactly which RCU callback (or other issue) that was causing > > the problem.  It would be good to do this in case there is some other > > problem lurking that might bite us in the future.  Mingming has therefore > > put together the following diagnostic patch which should identify the > > callbacks, please see below. > > > > So could you please run this and let us know what you find?  There should > > at least be a message for artificial_callback(). > > > > Do i need to apply this patch on today's Linus master or on -rc7 ? Please do not use -rc7, as that would reproduce your hang. Linus master tree would be best, but -rc7 with the fix applied would work fine as well. Thanx, Paul