linux-kernel - Re: [perf] more perf_fuzzer memory corruption

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Message-ID: <alpine.DEB.2.10.1405021218350.22556@vincent-weaver-1.umelst.maine.edu>
Date:	Fri, 2 May 2014 12:22:30 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [perf] more perf_fuzzer memory corruption

I'll try the patch next.

Meanwhile, can polling on a closed event cause problems with the reference 
count?

In my various failure traces there's always been a poll() active at the 
time of crash, and I added some trace_printk()s and it looks like poll is 
at least attempting to poll on the closed file descriptor that's causing 
us problems.

Vince
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