Messages in this thread | | | Date | Wed, 10 Sep 2014 23:59:08 +0200 | From | Andi Kleen <> | Subject | Re: BUG uncore_assign_events |
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> # 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;
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.
Did the test do CPU hot plug?
BTW i don't think it's a security issue because the uncore driver is only accesible for root.
-Andi
-- ak@linux.intel.com -- Speaking for myself only.
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