linux-kernel - Re: [PATCH] kernel/signal.c: Export symbol __lock_task

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Message-ID: <20200622113141.GC6516@redhat.com>
Date:   Mon, 22 Jun 2020 13:31:42 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Dominique Martinet <asmadeus@...ewreck.org>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        Alexander Kapshuk <alexander.kapshuk@...il.com>,
        linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
        akpm@...ux-foundation.org, liuzhiqiang26@...wei.com,
        joel@...lfernandes.org, paulmck@...ux.vnet.ibm.com,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] kernel/signal.c: Export symbol __lock_task_sighand

On 06/22, Dominique Martinet wrote:
>
> What about the possibility of sighand being null that the function does
> check, is that impossible for current as well?

It is only possible if "current" has already exited and passed exit_notify(),
iow if it is already a zombie and can be (auto)reaped.

Oleg.