linux-kernel - Re: kmemleak splat on copy

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Date:   Fri, 17 Feb 2017 11:32:34 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Mateusz Guzik <mguzik@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: kmemleak splat on copy_process()

On Fri, Feb 17, 2017 at 9:23 AM, Luis R. Rodriguez <mcgrof@...nel.org> wrote:
> On Fri, Feb 17, 2017 at 9:07 AM, Andy Lutomirski <luto@...capital.net> wrote:
>> But maybe
>> there really is a race in which a kmemleak check right in the middle
>> of duplicating the task struct really can't see the stack pointer.
>
> Funny, but it was actually using kmemleak how I can easily reproduce:
>
> To reproduce the kmemleak splat:
>
> echo clear >  /sys/kernel/debug/kmemleak
> echo scan >  /sys/kernel/debug/kmemleak
> cat /sys/kernel/debug/kmemleak

Worked fine for me.  Maybe your config is special?

--Andy