linux-kernel - Re: [RFC PATCH 4/4] Fix: sched/membarrier: p->mm->membarrier

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Message-ID: <20190913160416.GA29518@redhat.com>
Date:   Fri, 13 Sep 2019 18:04:17 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        paulmck <paulmck@...ux.ibm.com>, Ingo Molnar <mingo@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Russell King, ARM Linux" <linux@...linux.org.uk>,
        Chris Metcalf <cmetcalf@...hip.com>,
        Chris Lameter <cl@...ux.com>, Kirill Tkhai <tkhai@...dex.ru>,
        Mike Galbraith <efault@....de>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 4/4] Fix: sched/membarrier: p->mm->membarrier_state
 racy load (v2)

On 09/13, Mathieu Desnoyers wrote:
>
> membarrier_exec_mmap(), which seems to be affected by the same problem.

IIRC, in the last version it is called by exec_mmap() undef task_lock(),
so it should fine.

Oleg.