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SubjectRe: 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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