Re: perf: perf_fuzzer crashes on Pentium 4 systems

[Vince Weaver]

On Thu, 4 Apr 2019, Cyrill Gorcunov wrote:

> 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.

OK, it turns out the hard-lock and the null pointer dereference might be 
the same, I have a random seed for the fuzzer from a hard-lock crash that 
reproduces and it generated the null pointer crash.  (This is with your 
patch applied).

I can try to see if I can bisect down to a specific event sequence that 
triggers this, but that can be tricky sometimes if things lock up so fast 
that the event log doesn't get written out before the crash.

Vince