linux-kernel - Re: OOPS in perf_mmap

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Message-ID: <20130530072532.GF4341@laptop>
Date:	Thu, 30 May 2013 09:25:32 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	Al Viro <viro@...iv.linux.org.uk>, 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: OOPS in perf_mmap_close()

On Wed, May 29, 2013 at 03:18:32PM -0400, Vince Weaver wrote:
> On Wed, 29 May 2013, Peter Zijlstra wrote:
> > 
> > Hurm.. I don't suppose you have an easy reproducer handy eh? I'll go
> > stare at it. At least the current state is better than before, but
> > clearly we're not quite there yet.
> 
> OK, below is an easy reproducer.  Just run it two or three times.
> It leaks 129 pages in user->locked_vm each time you run it.
> 
> It took me a while to bisect this down from 10,000 syscalls to just 3.
> I now have a tool that can generate valid perf test_cases from my fuzzer 
> traces, which should be useful.

Awesome! How specific is it to perf? I mean, would that tool work
equally well for other tinity report?

I'll go prod, thanks again!
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