From: Chuck Ebbert <cebbert.lkml@gmail.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
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
Date: Thu, 11 Sep 2014 00:29:56 -0500 [thread overview]
Message-ID: <20140911002956.5e4aa1d9@as> (raw)
In-Reply-To: <20140910215908.GL4120@two.firstfloor.org>
On Wed, 10 Sep 2014 23:59:08 +0200
Andi Kleen <andi@firstfloor.org> wrote:
> > # addr2line -i -e ivb-ep-build/vmlinux ffffffff81025f18
> >
> > arch/x86/include/asm/bitops.h:318
> > arch/x86/kernel/cpu/perf_event_intel_uncore.c:3339
>
> i == zero (ok)
> c points to some kernel looking address
> hwc->idx is 64
>
> /* fastpath, try to reuse previous register */
> for (i = 0; i < n; i++) {
> hwc = &box->event_list[i]->hw;
> c = hwc->constraint;
>
> /* never assigned */
> if (hwc->idx == -1)
> break;
>
> /* constraint still honored */
> if (!test_bit(hwc->idx, c->idxmsk))
> break;
>
hwc->idx is not 64 -- it's 0xd000064
The bt insn is causing a page fault 27 MB past c->idxmsk
next prev parent reply other threads:[~2014-09-11 5:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-10 9:16 BUG uncore_assign_events Peter Zijlstra
2014-09-10 21:59 ` Andi Kleen
2014-09-11 5:29 ` Chuck Ebbert [this message]
2014-09-11 19:21 ` Andi Kleen
2014-09-11 8:11 ` Peter Zijlstra
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