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

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Message-ID: <alpine.DEB.2.10.1405010921550.18142@vincent-weaver-1.umelst.maine.edu>
Date:	Thu, 1 May 2014 09:22:48 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Thomas Gleixner <tglx@...utronix.de>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [perf] more perf_fuzzer memory corruption

On Thu, 1 May 2014, Peter Zijlstra wrote:

> On Thu, May 01, 2014 at 12:51:33AM +0200, Thomas Gleixner wrote:
> > And that's the issue which puzzles us. Let's look at what we expect:
> > 
> > Now the trace shows a different story:
> > 
> >      perf_fuzzer-4387  [001]  1802.628659: sys_enter:            
> NR 298 (69bb58, 0, ffffffff, 12, 0, 0)
> 
> That's a per-cpu event (.pid = -1, .cpu = 12), they don't get inherited,
> so the only thing keeping it alive is the fd the child got. So
> exit_files() killing this thing makes perfect sense.

wait, are you sure?  Isn't that pid=0, cpu=-1, group_fd=12?

my machine only has 8 cpus...

Vince
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