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Date: Thu, 11 Sep 2014 10:11:37 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: linux-kernel@vger.kernel.org, Stephane Eranian <eranian@google.com>,
        Ingo Molnar <mingo@kernel.org>,
        Vince Weaver <vincent.weaver@maine.edu>
Subject: Re: BUG uncore_assign_events
Message-ID: <20140911081137.GT6758@twins.programming.kicks-ass.net>
References: <20140910091626.GO16043@twins.programming.kicks-ass.net>
 <20140910215908.GL4120@two.firstfloor.org>
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On Wed, Sep 10, 2014 at 11:59:08PM +0200, Andi Kleen wrote:
> > # addr2line -i -e ivb-ep-build/vmlinux ffffffff81025f18
> >=20
> > arch/x86/include/asm/bitops.h:318
> > arch/x86/kernel/cpu/perf_event_intel_uncore.c:3339
>=20
> i =3D=3D zero  (ok)
> c points to some kernel looking address
> hwc->idx is 64
>=20
>      /* fastpath, try to reuse previous register */
>         for (i =3D 0; i < n; i++) {
>                 hwc =3D &box->event_list[i]->hw;
>                 c =3D hwc->constraint;
>=20
>                 /* never assigned */
>                 if (hwc->idx =3D=3D -1)
>                         break;
>=20
>                 /* constraint still honored */
>                 if (!test_bit(hwc->idx, c->idxmsk))
>                         break;
>=20
> My best bet is something goes wrong in uncore_pmu_to_box or
> uncore_event_to_pmu in hte caller, so the box is bogus.
>=20
> Did the test do CPU hot plug?

Dunno, I don't think it does. Its just the perf_fuzzer thing. A quick
grep of the source doesn't show hotplug stuff.

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