linux-kernel - Re: perf: another perf

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Message-ID: <alpine.DEB.2.11.1505270957500.21375@vincent-weaver-1.umelst.maine.edu>
Date:	Wed, 27 May 2015 09:58:49 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: perf: another perf_fuzzer generated lockup

On Wed, 27 May 2015, Peter Zijlstra wrote:

> On Fri, May 08, 2015 at 12:40:48AM -0400, Vince Weaver wrote:
> > 
> > This is a new one I think, I hit it on the haswell machine running 
> > 4.1-rc2.
> > 
> 
> Vince, should I still be running fast_repro99.sh ? Or is there another
> preferred way to start the beast?

yes, that's still probably the best way to start it.

I've recently been overhauling the fuzzer including a massive re-work of 
the mmap() code (to try to exercise the AUX codepath) so if it starts 
segfaulting on you that's probably why.

Vince
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