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Date: Wed, 14 May 2014 20:37:39 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Dave Jones <davej@redhat.com>, Sasha Levin <sasha.levin@oracle.com>,
        Ingo Molnar <mingo@kernel.org>, acme@ghostprotocols.net,
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        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: perf: use after free in perf_remove_from_context
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On Wed, May 14, 2014 at 01:20:43PM -0400, Dave Jones wrote:
> Pretty strong odds it's mremap causing those double frees.  You can
> -xmremap that to see if it goes away.

unless I'm entirely pebkac atm it doesn't seem to help any.