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Date:   Tue, 24 Jan 2017 14:17:48 +0100
From:   Peter Zijlstra <>
To:     Dmitry Vyukov <>
Cc:     Ingo Molnar <>,
        Arnaldo Carvalho de Melo <>,
        Alexander Shishkin <>,
        LKML <>,
        syzkaller <>
Subject: Re: perf: use-after-free in perf_event_for_each

On Mon, Jan 23, 2017 at 06:04:42PM +0100, Peter Zijlstra wrote:
> On Mon, Jan 23, 2017 at 02:30:12PM +0100, Dmitry Vyukov wrote:
> > Hello,
> > 
> > The following program triggers use-after-free in perf_event_for_each:
> >

I've been running 60 concurrent instances of that thing for hours now,
and have not been able to reproduce :-/

I did enable CONFIG_KASAN but otherwise booted as normal, and the thing

[    0.000000] kasan: KernelAddressSanitizer initialized

Is there anything else I should do?

I've ran out of ideas and it would be very helpful if I could prod at
something that fails...

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