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

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Message-ID: <20151217142823.GO6373@twins.programming.kicks-ass.net>
Date:	Thu, 17 Dec 2015 15:28:23 +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 03:26:17PM +0100, Peter Zijlstra wrote:
> On Thu, Dec 17, 2015 at 03:08:49PM +0100, Dmitry Vyukov wrote:
> > On Thu, Dec 17, 2015 at 3:06 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> > > On Thu, Dec 10, 2015 at 08:57:40PM +0100, Peter Zijlstra wrote:
> > >> I'm not sure I can explain your problem with this, but I figure its
> > >> worth a try.
> > >
> > > Did it make a difference?
> > >
> > > Also, does the syzkaller thing do cpu-hotplug during its runs?
> > 
> > See my email on Dec 15.
> 
> I have 4 emails from you on that day (and one private), they pertain to
> getting stuck in perf_{install,remove}_from_context(). None of those
> emails seem to contain an answer to either of the two above questions.
> 
>   CACT4Y+Za4L4q6FZLXjyGbnSYRwa7RJZYcG_s562q+CrNy9C75w@...l.gmail.com
>   CACT4Y+YUkYgCuQFW6eBTtdfRqdF7EEtrB3VaYJk+LUXE_-iGRQ@...l.gmail.com
>   CACT4Y+bvHWuyDZjoFhLAOiK1rfNQcfuSJCY0oS5xA=u8j04bXQ@...l.gmail.com
>   CACT4Y+an67KnTsVVzYVvrYKW9yg7PbDuC8WyB38PiWRoSt0UCQ@...l.gmail.com
> 
> and in private:
> 
>   CACT4Y+Zb1vU192JbCnyS9qY3cpsvfAUJdpBVUsmosueCtQjSXQ@...l.gmail.com
> 
> Did I miss an email?

Yes, I seem to have missed this one:

  CACT4Y+Y_YdEd-YGdWq-wQV6S+1M2nKA6atYO2DOFa8-wtQ8QWg@...l.gmail.com

found it, thanks!
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