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

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Date:	Thu, 31 Dec 2015 18:15:41 +0100
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 3:43 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> 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 ..

Hi Peter,

Any progress with this?
I can't continue to test perf subsytem, as it reliably hangs my machines.
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