Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S932789AbcCWTuV (ORCPT <rfc822;w@1wt.eu>);
	Wed, 23 Mar 2016 15:50:21 -0400
Received: from e17.ny.us.ibm.com ([129.33.205.207]:60912 "EHLO
	e17.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1756652AbcCWTuS (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 23 Mar 2016 15:50:18 -0400
X-IBM-Helo: d01dlp01.pok.ibm.com
X-IBM-MailFrom: paulmck@linux.vnet.ibm.com
X-IBM-RcptTo: linux-kernel@vger.kernel.org
Date: Wed, 23 Mar 2016 12:50:13 -0700
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: "Chatre, Reinette" <reinette.chatre@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>,
        Josh Triplett <josh@joshtriplett.org>, Ross Green <rgkernel@gmail.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        John Stultz <john.stultz@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        lkml <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Lai Jiangshan <jiangshanlai@gmail.com>,
        "dipankar@in.ibm.com" <dipankar@in.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        rostedt <rostedt@goodmis.org>, David Howells <dhowells@redhat.com>,
        Eric Dumazet <edumazet@google.com>,
        Darren Hart <dvhart@linux.intel.com>,
        =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>,
        Oleg Nesterov <oleg@redhat.com>, pranith kumar <bobby.prani@gmail.com>
Subject: Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17
Message-ID: <20160323195013.GJ4287@linux.vnet.ibm.com>
Reply-To: paulmck@linux.vnet.ibm.com
References: <20160318235641.GH4287@linux.vnet.ibm.com>
 <20160321092230.75f23fa9@yairi>
 <20160321172616.GU4287@linux.vnet.ibm.com>
 <0D818C7A2259ED42912C1E04120FDE26712E27C8@ORSMSX111.amr.corp.intel.com>
 <20160322174011.GM4287@linux.vnet.ibm.com>
 <0D818C7A2259ED42912C1E04120FDE26712E3DF3@ORSMSX111.amr.corp.intel.com>
 <20160322211939.GT4287@linux.vnet.ibm.com>
 <0D818C7A2259ED42912C1E04120FDE26712E4559@ORSMSX111.amr.corp.intel.com>
 <20160323182055.GG4287@linux.vnet.ibm.com>
 <0D818C7A2259ED42912C1E04120FDE26712E4616@ORSMSX111.amr.corp.intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <0D818C7A2259ED42912C1E04120FDE26712E4616@ORSMSX111.amr.corp.intel.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
X-TM-AS-MML: disable
X-Content-Scanned: Fidelis XPS MAILER
x-cbid: 16032319-0041-0000-0000-000003ADFEAD
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 541
Lines: 17

On Wed, Mar 23, 2016 at 06:25:50PM +0000, Chatre, Reinette wrote:
> Hi Paul,
> 
> On 2016-03-23, Paul E. McKenney wrote:
> > Please boot with the following parameters:
> > 
> > 	rcu_tree.rcu_kick_kthreads ftrace
> > trace_event=sched_waking,sched_wakeup,sched_wake_idle_without_ipi
> > 
> > Or was this run with tracing?  If so, less than three hours isn't too bad.
> 
> This was with tracing enabled, only missing the crucial
> rcu_tree.rcu_kick_kthreads

Good, then the condition did trigger with tracing enabled!  ;-)

							Thanx, Paul