On Wed, 10 Sep 2014 23:59:08 +0200
Andi Kleen <[email protected]> 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
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