From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1756232AbdLVRI6 (ORCPT <rfc822;w@1wt.eu>);
        Fri, 22 Dec 2017 12:08:58 -0500
Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:39712 "EHLO
        mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL)
        by vger.kernel.org with ESMTP id S1755847AbdLVRI4 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Fri, 22 Dec 2017 12:08:56 -0500
Date: Fri, 22 Dec 2017 09:09:07 -0800
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Anna-Maria Gleixner <anna-maria@linutronix.de>,
        Sebastian Siewior <bigeasy@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Ingo Molnar <mingo@kernel.org>
Subject: Re: [patch 0/4] timer/nohz: Fix timer/nohz woes
Reply-To: paulmck@linux.vnet.ibm.com
References: <20171222145111.919609918@linutronix.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20171222145111.919609918@linutronix.de>
User-Agent: Mutt/1.5.21 (2010-09-15)
X-TM-AS-GCONF: 00
x-cbid: 17122217-0024-0000-0000-00000305F9F0
X-IBM-SpamModules-Scores: 
X-IBM-SpamModules-Versions: BY=3.00008244; HX=3.00000241; KW=3.00000007;
 PH=3.00000004; SC=3.00000244; SDB=6.00964001; UDB=6.00487739; IPR=6.00743988;
 BA=6.00005755; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000;
 ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00018677; XFM=3.00000015;
 UTC=2017-12-22 17:08:54
X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused
x-cbparentid: 17122217-0025-0000-0000-00004664B4AD
Message-Id: <20171222170907.GJ7829@linux.vnet.ibm.com>
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-12-22_06:,,
 signatures=0
X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501
 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0
 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000
 definitions=main-1712220240
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, Dec 22, 2017 at 03:51:11PM +0100, Thomas Gleixner wrote:
> Paul was observing weird stalls which are hard to reproduce and decode. We
> were finally able to reproduce and decode the wreckage on RT.
> 
> The following series addresses the issues and hopefully nails the root
> cause completely.
> 
> Please review carefully and expose it to the dreaded rcu torture tests
> which seem to be the only way to trigger it.

Best Christmas present ever, thank you!!!

Just started up three concurrent 10-hour runs of the infamous rcutorture
TREE01 scenario, and will let you know how it goes!

							Thanx, Paul