linux-kernel - Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

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Date:	Wed, 23 Mar 2016 12:50:13 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	"Chatre, Reinette" <reinette.chatre@...el.com>
Cc:	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Josh Triplett <josh@...htriplett.org>,
	Ross Green <rgkernel@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	"dipankar@...ibm.com" <dipankar@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	rostedt <rostedt@...dmis.org>,
	David Howells <dhowells@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	pranith kumar <bobby.prani@...il.com>
Subject: Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

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