linux-kernel - Re: x86_pmu_start WARN

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Message-ID: <alpine.DEB.2.10.1402130910520.22057@vincent-weaver-1.um.maine.edu>
Date:	Thu, 13 Feb 2014 09:11:49 -0500 (EST)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Vince Weaver <vincent.weaver@...ne.edu>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: x86_pmu_start WARN_ON.

On Wed, 12 Feb 2014, Vince Weaver wrote:

> On Tue, 11 Feb 2014, Peter Zijlstra wrote:
> > 
> > I'll see if I can run through the reproduction case by hand.
> 
> I've come up with an even simpler test case with all of the extraneous 
> settings removed.  Included below.
> 
> It is triggered in this case when you have:
> 
>   An event group of breakpoint, cycles, branches
>   An event of instructions with precise=1
>   A tracepoint
> 
> and then you close the tracepoint.

and for what it's worth, it's the cycles event (type=0 config=0) that's 
causing the WARN_ON.

It looks like I'm going to have to resort to sprinkling the code with 
printk()s to solve this one.

Vince
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