linux-kernel - Re: 2.6.35-stable/ppc64/p7: suspicious rcu_dereference_check() usage detected during 2.6.35-stable boot

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Date:	Thu, 16 Sep 2010 11:12:31 -0400
From:	Valdis.Kletnieks@...edu
To:	paulmck@...ux.vnet.ibm.com
Cc:	Subrata Modak <subrata@...ux.vnet.ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Li Zefan <lizf@...fujitsu.com>,
	Linuxppc-dev <Linuxppc-dev@...abs.org>,
	sachinp <sachinp@...ux.vnet.ibm.com>,
	DIVYA PRAKASH <dipraksh@...ux.vnet.ibm.com>
Subject: Re: 2.6.35-stable/ppc64/p7: suspicious rcu_dereference_check() usage detected during 2.6.35-stable boot

On Mon, 09 Aug 2010 09:12:00 PDT, "Paul E. McKenney" said:
> On Mon, Aug 02, 2010 at 02:22:12PM +0530, Subrata Modak wrote:
> > Hi,
> >
> > The following suspicious rcu_dereference_check() usage is detected
> > during 2.6.35-stable boot on my ppc64/p7 machine:
> >
> > =========================
> > [ INFO: suspicious rcu_dereference_check() usage. ]
> > ---------------------------------------------------
> > kernel/sched.c:616 invoked rcu_dereference_check() without protection!
> > other info that might help us debug this:

> Thank you for locating this one!  This looks like the same issue that
> Ilia Mirkin located.  Please see below for my analysis -- no fix yet,
> as I need confirmation from cgroups experts.  I can easily create a
> patch that suppresses the warning, but I don't yet know whether this is
> the right thing to do.

Ping?  I just hit it on 2.6.36-rc4-mmotm0915.  Just wanted to make sure the
issue hadn't been lost/forgotten.

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