linux-kernel - Re: perf: perf_fuzzer triggers instant reboot

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Date:	Thu, 11 Sep 2014 09:27:45 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: perf: perf_fuzzer triggers instant reboot

On Wed, 10 Sep 2014, Peter Zijlstra wrote:

> > I've been trying for months now to make progress on these but this type of 
> > bug is really hard to debug.
> 
> Did we actually fix some at least? I had the idea we did get a few
> sorted. But yes, this is tedious and hard going :/

we did fix some of them.

Others it's a bit unclear.  Fixes went in that made my particular testcase 
stop triggering things, but more fuzzing would crash in similar ways.  So 
it's unclear if the actual problem was fixed or if the fix just shook 
things up enough to make the original bug (probably a race condition of 
some sort) harder to trigger.

Vince
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