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Date:   Tue, 24 Jan 2017 14:49:18 +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 Tue, Jan 24, 2017 at 02:29:19PM +0100, Dmitry Vyukov wrote:
> Try to run more parallel processes at the same time.
> This program will run 32 processes in a tight loop:
> It triggered the UAF in several minutes for me. I have 4 CPUs in the
> VM. If you have more, set number of processes to 8*CPU.

No VM here, I'll up to 320 processes.

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