Messages in this thread | | | Date | Thu, 11 Jan 2018 20:50:18 +0100 | From | Peter Zijlstra <> | Subject | Re: perf: perf_fuzzer quickly locks up on 4.15-rc7 |
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On Thu, Jan 11, 2018 at 01:21:12PM -0600, Josh Poimboeuf wrote: > Yuck. This time it was stack recursion on the entry stack. In the > previous error, recursion was detected on the IRQ stack. Otherwise they > look quite similar. > > Was that also with nopti?
Both with pti enabled, nopti makes things work again.
> I haven't had a chance to try it yet, any idea if these would be > recreatable in a VM?
Good question; typically we run the perf fuzzer on read hardware because the PMU doesn't virtualize much. But if software perf is enough to trigger this, that would certainly help.
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