From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755206Ab2GXBTr (ORCPT ); Mon, 23 Jul 2012 21:19:47 -0400 Received: from e23smtp07.au.ibm.com ([202.81.31.140]:38040 "EHLO e23smtp07.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755150Ab2GXBTp (ORCPT ); Mon, 23 Jul 2012 21:19:45 -0400 Message-ID: <500DF828.3050102@linux.vnet.ibm.com> Date: Tue, 24 Jul 2012 09:19:36 +0800 From: Michael Wang User-Agent: Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20120615 Thunderbird/13.0.1 MIME-Version: 1.0 To: Martin Mokrejs CC: Mike Galbraith , LKML , "paulmck@linux.vnet.ibm.com" , dan.carpenter@oracle.com Subject: Re: [QUESTION ON BUG] the rcu stall issue could not be reproduced References: <5008CBD4.6070907@linux.vnet.ibm.com> <1342767624.7432.54.camel@marge.simpson.net> <500D9BFC.9090707@fold.natur.cuni.cz> In-Reply-To: <500D9BFC.9090707@fold.natur.cuni.cz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit x-cbid: 12072401-0260-0000-0000-0000018FC6A2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/24/2012 02:46 AM, Martin Mokrejs wrote: > Hi, > I see few more RCU bugs reported in bugzilla: > > https://bugzilla.kernel.org/show_bug.cgi?id=43028 > https://bugzilla.kernel.org/show_bug.cgi?id=40092 > https://bugzilla.kernel.org/show_bug.cgi?id=42997 > > And, I placed my previous long email with logs at > https://bugzilla.kernel.org/show_bug.cgi?id=45091 > > Hope this helps eventually once. That's very helpful, I need some time to read and think about it, thanks for the info ;-) Regards, Michael Wang > Martin > > Mike Galbraith wrote: >> On Fri, 2012-07-20 at 11:09 +0800, Michael Wang wrote: >>> Hi, Mike, Martin, Dan >>> >>> I'm currently taking an eye on the rcu stall issue which was reported by >>> you in the mail: >>> >>> rcu: endless stalls >>> From: Mike Galbraith >>> linux-3.4-rc7: rcu_sched self-detected stall on CPU >>> From: Martin Mokrejs >>> RCU stalls in linux-next >>> From: Dan Carpenter >>> >>> I try to reproduce the issue on my X86 server with 12 cpu >> >> The 'endless stalls' box was 341.33333 times larger. Dunno if you can >> even set a serial port slow enough to approximate all cores trying to >> gripe through a single pinhole simultaneously. >> >> -Mike >> >> > >