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

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Date:	Mon, 1 Jul 2013 11:13:01 -0400 (EDT)
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@...stprotocols.net>,
	trinity@...r.kernel.org
Subject: Re: [testcase] perf: yet another fuzzer triggered crash

On Mon, 1 Jul 2013, Peter Zijlstra wrote:


> OK, so on my westmere it triggers that WARN in task_ctx_sched_out() a
> _lot_ (I removed the ONCE for easier debugging earlier -- still kinda
> stumped there).
> 
> Then this thing causes an RCU stall and starts triggering NMI watchdog
> msgs.. so YAY! :-)

I'm glad it's not just me.

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.

Vince
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