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

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Message-ID: <alpine.DEB.2.10.1404171037590.22226@vincent-weaver-1.um.maine.edu>
Date:	Thu, 17 Apr 2014 10:42:47 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Ingo Molnar <mingo@...nel.org>
cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [perf] more perf_fuzzer memory corruption

On Thu, 17 Apr 2014, Ingo Molnar wrote:

> 
> * Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Thu, Apr 17, 2014 at 11:48:15AM +0200, Ingo Molnar wrote:
> > > Is there some place where I can pick up the latestest of your fuzzer?
> > > 
> > > PeterZ has trouble reproducing the corruption locally - I'd like to 
> > > run it too, maybe I have hardware that triggers it more readily.
> > 
> > From a few emails up:
> > 
> > "If you want to try running the fuzzer on your machine too just do:
> >         git clone https://github.com/deater/perf_event_tests.git
> >         cd fuzzer
> >         make
> > and then try running the "./fast_repro98.sh" script, as that's the forking
> > workload I've been using when tracking this issue."

I have to admit the slab corruption message is a new development with 
3.15-rc1.

I've been trying to track a possibly-the-same (but harder to debug)
memory corruption issue for a while now.

I can trigger this type of error easily on both a core2 and haswell 
machine.

I have a few more test machines I can run, and just got some extra 
serial cables so maybe I can hook up a few more serial consoles and do 
some additional testing.

Vince
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