From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754015AbZDMWrg (ORCPT ); Mon, 13 Apr 2009 18:47:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753231AbZDMWr0 (ORCPT ); Mon, 13 Apr 2009 18:47:26 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:58892 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752341AbZDMWr0 (ORCPT ); Mon, 13 Apr 2009 18:47:26 -0400 Date: Mon, 13 Apr 2009 15:47:24 -0700 From: "Paul E. McKenney" To: Tetsuo Handa Cc: viro@ZenIV.linux.org.uk, linux-kernel@vger.kernel.org, hugh@veritas.com, jmorris@namei.org, akpm@linux-foundation.org Subject: Re: [2.6.30-rc1] RCU detected CPU 1 stall Message-ID: <20090413224724.GJ6983@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <200904110608.IED21123.FQOVMtSOOHFFLJ@I-love.SAKURA.ne.jp> <20090410231245.GF6719@linux.vnet.ibm.com> <20090410233919.GS26366@ZenIV.linux.org.uk> <200904130048.n3D0mw1f077050@www262.sakura.ne.jp> <20090413195504.GF6983@linux.vnet.ibm.com> <200904140631.BCI82883.LFOHOFJtFMOSVQ@I-love.SAKURA.ne.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200904140631.BCI82883.LFOHOFJtFMOSVQ@I-love.SAKURA.ne.jp> User-Agent: Mutt/1.5.15+20070412 (2007-04-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 14, 2009 at 06:31:05AM +0900, Tetsuo Handa wrote: > Paul E. McKenney wrote: > > > Hello. > > > > > > Paul E. McKenney wrote: > > > > Is this reproducible? > > > Not always, but it is reproducible. > > > > Does it reproduce well enough to bisect? > > > Not impossible, but difficult. This happens less than once on 10 trials. > > > > Al Viro wrote: > > > > I'd really love to see results of repeated alt-sysrq-p/alt-sysrq-l, just > > > > to see where was it actually spinning. > > > Below is sysrq message. > > > Maybe something related to khelper's current->mm == NULL warning problem. > > > Full log is at http://I-love.SAKURA.ne.jp/tmp/dmesg-2.6.30-rc1-200904130930.txt . > > > > I have to defer to the mm guys on this one. > > Latest info on khelper's current->mm == NULL warning problem is at > http://lkml.org/lkml/2009/4/13/85 . Thank you for the pointer! Thanx, Paul