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SubjectRe: perf: perf_fuzzer crashes on Pentium 4 systems
On Thu, Apr 04, 2019 at 09:25:47AM -0400, Vince Weaver wrote:
>
> It looks like there are at least two bugs here, one that's a full
> hardlockup with nothing on serial console. The other is the NULL
> dereference.
>

Seems so. I've spent plenty of time yesterday trying to figure out how
we even reach the case when event = nil but without much luck.

> Just ran with your patch applied and it hit the hard lockup case.
>
> I'll have to see if things are reproducible and I can try to see if I can
> get a reproducible value for what even caused the issue. perf_fuzzer has
> some infrastructure for determining that but it's hit or miss if you can
> get anything useful from it.

At least the sequence of events migh give us some ideas, maybe not indeed.
Thanks a huge, Vince!

> I'll keep running things, but I'm a bit busy at work here the next few
> days so there might be some delay in the results.

Sure, take your time. I think this problem with p4 is not urgent. I'll ping
you if I get some more ideas.

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