linux-kernel - Re: perf: fuzzer gets CPU stuck in perf

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Date:	Thu, 19 Feb 2015 12:05:02 -0500 (EST)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: perf: fuzzer gets CPU stuck in perf_callchain()

On Thu, 19 Feb 2015, Peter Zijlstra wrote:

> On Thu, Feb 19, 2015 at 11:54:40AM -0500, Vince Weaver wrote:
> > 
> > Another bug found by the perf_fuzzer().  I think this one is different
> > than the one I sent the other day, it looks like something is going
> > very wrong in perf_callchain().
> > 
> > This one is reasonably reproducible, if there's any extra debugging that I 
> > can add.  This is on a Haswell machine with git as of a few days ago.
> 
> Aw man, and I had such good hopes with you saying it took 4 days to find
> problems :/
> 
> I'll try and get some time to stare at both.

well if it's any comfort it is definitely on the order of days now before 
issues crop up (rather than minutes).  And the Haswell machine is the 
problem-causing one.  I also have a core2 and a Cortex-A9 machine fuzzing 
away and they've been at it a week now without turning up anything.

Vince

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