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SubjectRe: perf: perf_fuzzer quickly locks up on 4.15-rc7
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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