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

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Message-ID: <20160328062851.GE6344@twins.programming.kicks-ass.net>
Date:	Mon, 28 Mar 2016 08:28:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.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>,
	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 Sun, Mar 27, 2016 at 02:09:14PM -0700, Paul E. McKenney wrote:

> > Does that system have MONITOR/MWAIT errata?
> 
> On the off-chance that this question was also directed at me,

Hehe, it wasn't, however, since we're here..

> here is
> what I am running on.  I am running in a qemu/KVM virtual machine, in
> case that matters.

Have you actually tried on real proper hardware? Does it still reproduce
there?