On Thu, Apr 30, 2015 at 03:08:56PM -0400, Vince Weaver wrote:
>
> So the perf_fuzzer caught this after about a week of fuzzing on a Haswell
> machine running a recent git kernel (pre 4.1-rc1 though).
>
> We've seen this BUG before and various fixes were applied but apparently
> it wasn't enough.
>
> Sadly it doesn't seem to be reproducible.
>
> validate_group() -> x86_pmu.schedule_events() -> ???? -> variable_test_bit()
> (hard to tell which test bit with all the inlining going on).
Assuming you build with debug info addr2line -i can help, but I think I
found it by comparing the Code section below with my objdump -D output.
Its:
/* constraint still honored */
if (!test_bit(hwc->idx, c->idxmsk))
break;
Which would seem to suggest c is NULL.
Lemme go figure out how that could happen.
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