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

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Message-ID: <20160327205439.GY6356@twins.programming.kicks-ass.net>
Date:	Sun, 27 Mar 2016 22:54:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	paulmck@...ux.vnet.ibm.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>,
	lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.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>,
	"Chatre, Reinette" <reinette.chatre@...el.com>
Subject: Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 21, 2016 at 09:22:30AM -0700, Jacob Pan wrote:
> > > We're seeing a similar stall (~60 seconds) on an x86 development
> > > system here.  Any luck tracking down the cause of this?  If not, any
> > > suggestions for traces that might be helpful?

> +Reinette, she has the system that can reproduce the issue. I
> believe she is having some other problems with it at the moment. But
> the .config should be available. Version is v4.5.

Does that system have MONITOR/MWAIT errata?