Date: Sun, 12 May 2013 10:21:35 -0700
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: =?iso-8859-1?Q?Bj=F8rn?= Mork <bjorn@mork.no>
Cc: Dipankar Sarma <dipankar@in.ibm.com>, linux-kernel@vger.kernel.org,
        rostedt@goodmis.org
Subject: Re: [v3.10-rc1] WARNING: at kernel/rcutree.c:502
Message-ID: <20130512172135.GJ3648@linux.vnet.ibm.com>
Reply-To: paulmck@linux.vnet.ibm.com
References: <87ip2opntp.fsf@nemi.mork.no>
 <20130512113905.GH3648@linux.vnet.ibm.com>
 <87li7kp50r.fsf@nemi.mork.no>
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On Sun, May 12, 2013 at 05:55:00PM +0200, Bj?rn Mork wrote:
> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> writes:
> > On Sun, May 12, 2013 at 11:08:50AM +0200, Bj?rn Mork wrote:
> >> Hello,
> >> 
> >> got the splat below when running powertop on plain v3.10-rc1
> >> (i.e. without my previously mentioned revert patch or any other extra
> >> patches).  Config attached.
> >
> > OK, it looks like you have context-tracking enabled, so you might be
> > hitting a bug that Steven Rostedt found a few days ago.  Could you
> > please try out his fix below?
> 
> Thanks for the quick reply, but I'm afraid that patch had no effect on
> the warning I got. It's still there.

Other than wondering whether powertop has issues similar to the bug
Steven Rostedt located, I must confess myself clueless.  Here are some
diagnostics I can suggest:

1.	Run in 32-bit mode.  This disables some of the new adaptive-ticks
	functionality, so might give a probabilistic indication of where
	the bug lies.

2.	The standard fallback of bisection.

Would you be willing to do either of these?

							Thanx, Paul

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