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    SubjectRe: x86_pmu_start WARN_ON.
    On Thu, 13 Feb 2014, Vince Weaver wrote:
    > On Wed, 12 Feb 2014, Vince Weaver wrote:
    > >
    > > 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.

    The plot thickens. The WARN_ON is not caused by the cycles event that we
    open, but it's caused by the NMI Watchdog cycles event.

    I'm not sure if that's useful info or not.

    Vince


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