Re: perf_fuzzer crash on pentium 4

Cyrill Gorcunov
2014-05-07T21:51:51Z

On Wed, May 07, 2014 at 05:17:22PM -0400, Vince Weaver wrote:
> On Wed, 7 May 2014, Cyrill Gorcunov wrote:
>
> > > I thought I was running with PeterZ's latest patch that was supposed to
> > > avoid the corruption. Hmmm. Let me reboot and try a few more things.
> >
> > Thanks! Please ping me if find something new.
>
> It turns out to be my fault, I was running with an incomplete version of
> PeterZ's patch. We need to get the fix into the kernel as apparently I
> fail at manually applying patches across multiple machines.
>
> So to summarize, with PeterZ's fix the various memory corruption crashes
> in the p4 code no longer happen.

Good. Thanks a lot, Vince!

> When fuzzing on the p4 *other* things do happen.
> * at least two warnings pop up almost instantly
> * eventually the machine will crash in an endless NMI storm
> * also I managed to get the machine wedged with an unkillable
> process, sort of like the known problem PeterZ has.
>
> The NMI issue is probably the only one that is p4 related, and I do get
> the NMI warnings on other machines too, it's just the p4 is the only one
> where it brings down the machine.

Vince, could you please provde more details on that? Is it possible
to somehow log which events were used by perf?