linux-kernel - Re: OOPS in perf_mmap

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Message-ID: <20130523152611.GE23650@twins.programming.kicks-ass.net>
Date:	Thu, 23 May 2013 17:26:11 +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 Thu, May 23, 2013 at 10:10:36AM -0400, Vince Weaver wrote:
> 
> I can confirm your patch avoids the oops on my machine.
> 
> It does lead to interesting behavior if I run the sample program
> multiple times (with added printfs):
> 
> vince@...e2:~$ ./perf_mmap_close_bug 
> mmap1=0x7f06a6e90000
> mmap2=0x7f06a6e7f000
> vince@...e2:~$ ./perf_mmap_close_bug 
> mmap1=0x7f878a138000
> mmap2=0x7f878a127000
> vince@...e2:~$ ./perf_mmap_close_bug 
> mmap1=0xffffffffffffffff
> Error opening fd2 Invalid argument
> 
> and then it never successfully completes again.  Is this unexpected 
> behavior?  

Sounds weird to me, I'll see if I can reproduce/understand.
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