linux-kernel - Re: [v3.10-rc1] WARNING: at kernel/rcutree.c:502

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Date:	Sun, 12 May 2013 10:21:35 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	Dipankar Sarma <dipankar@...ibm.com>, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org
Subject: Re: [v3.10-rc1] WARNING: at kernel/rcutree.c:502

On Sun, May 12, 2013 at 05:55:00PM +0200, Bjørn Mork wrote:
> "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> writes:
> > On Sun, May 12, 2013 at 11:08:50AM +0200, Bjørn 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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