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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
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