Messages in this thread | | | Date | Thu, 11 Sep 2014 00:29:56 -0500 | From | Chuck Ebbert <> | Subject | Re: BUG uncore_assign_events |
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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
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