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Date:	Thu, 6 Feb 2014 19:53:33 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [sched/preempt] INFO: rcu_sched self-detected stall on CPU { 1}

On Thu, Feb 06, 2014 at 07:46:35PM +0800, Fengguang Wu wrote:
> On Thu, Feb 06, 2014 at 12:27:31PM +0100, Peter Zijlstra wrote:
> > On Thu, Feb 06, 2014 at 05:56:46PM +0800, Fengguang Wu wrote:
> > > Hi Peter,
> > > 
> > > We noticed the below RCU stalls which will block the system.
> > > The problem is bisected to
> > > 
> > > commit 8cb75e0c4ec9786b81439761eac1d18d4a931af3
> > > Author:     Peter Zijlstra <peterz@...radead.org>
> > > AuthorDate: Wed Nov 20 12:22:37 2013 +0100
> > > Commit:     Ingo Molnar <mingo@...nel.org>
> > > CommitDate: Mon Jan 13 17:38:55 2014 +0100
> > > 
> > >     sched/preempt: Fix up missed PREEMPT_NEED_RESCHED folding
> > >     
> > >  arch/x86/include/asm/mwait.h |  2 +-
> > >  include/linux/preempt.h      | 15 +++++++++++++++
> > >  include/linux/sched.h        | 15 +++++++++++++++
> > >  kernel/cpu/idle.c            | 17 ++++++++++-------
> > >  kernel/sched/core.c          |  3 +--
> > >  5 files changed, 42 insertions(+), 10 deletions(-)
> > > 
> > > [   85.786775] INFO: rcu_sched self-detected stall on CPU { 1}  (t=15000 jiffies g=233 c=232 q=1940)
> > 
> > Did the initial kernel contain the below?
> 
> Nope, so I was testing some old tip sched/core..  Bisect log is

Peter, I just checked and find no longer showing up in new kernel tests.
So it must have been fixed up. Sorry for the noises!

Regards,
Fengguang
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