linux-kernel - Re: use-after-free in __perf_install_in

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Message-ID: <20151217144337.GF6344@twins.programming.kicks-ass.net>
Date:	Thu, 17 Dec 2015 15:43:37 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: use-after-free in __perf_install_in_context

On Thu, Dec 17, 2015 at 03:35:32PM +0100, Dmitry Vyukov wrote:
> In short, I did not see use-after-frees but perf_event_open fuzzing
> started hanging VMs very frequently, so testing is inconclusive.

Right, I'll get back to staring at that one.

Running your test case on bare metal got my machine reproducably stuck
but in a different place than you've reported.

Takes a while too, so far no luck in explaining/debugging it. All my
added debug code remains silent :/

I'll go think up more .. 
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