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    SubjectRe: perf: perf_fuzzer quickly locks up on 4.15-rc7
    On Mon, 8 Jan 2018, Ingo Molnar wrote:
    >
    > Note that the page table isolation (PTI) feature has a number of effects on perf
    > and on NMI handlers, so one of the things to try would be to disable PTI.

    Yes, it seems to be a KPTI issue.

    With KPTI disabled I can fuzz for a few hours, no problems.

    With KPTI enabled the perf_fuzzer on this haswell machine will lock up
    within minutes.

    It's a hard lockup with nothing over the serial console. It is not
    deterministic/reproducible either.

    Vince





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