linux-kernel - Re: [testcase] perf: yet another fuzzer triggered crash

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Date:	Tue, 2 Jul 2013 16:32:42 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Vince Weaver <vincent.weaver@...ne.edu>
cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	trinity@...r.kernel.org
Subject: Re: [testcase] perf: yet another fuzzer triggered crash

On Mon, 1 Jul 2013, Vince Weaver wrote:

> I'm in the process of kernel bisecting this, though all I can tell you so 
> far is 2.6.32 is unaffected by the bug but 3.2 and later are.

well, I spent 2 days bisecting between 3.1 and 3.2 (after 
wasting time bisecting between 3.0 and 3.1 by mistake) 
(also, a pox on whoever introduced that ethernet .config change between 
3.1. 3.2).

and of course what it gives me is
   a240f76165e6255384d4bdb8139895fac7988799

   perf, core: Introduce attrs to count in either host or guest mode

so the test case wasn't crashing because the auto-generated file
was setting exclude_guest and exclude_host causing perf_event_open() 
to fail.  If I drop setting those bits it still crashes.  

I guess back to the drawing board.

Vince
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