linux-kernel - Re: [PATCH V3] exit: trigger panic when global init has exited

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Message-ID: <20210322170945.GF20390@redhat.com>
Date:   Mon, 22 Mar 2021 18:09:45 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     qianli zhao <zhaoqianligood@...il.com>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>, christian@...uner.io,
        axboe@...nel.dk, Thomas Gleixner <tglx@...utronix.de>,
        Peter Collingbourne <pcc@...gle.com>,
        linux-kernel@...r.kernel.org, Qianli Zhao <zhaoqianli@...omi.com>
Subject: Re: [PATCH V3] exit: trigger panic when global init has exited

On 03/22, Oleg Nesterov wrote:
>
> On 03/22, qianli zhao wrote:
> >
> > Moving the decrement position should only affect between new and old
> > code position of movement of the decrement of
> > signal->live.
>
> Why do you think so? It can affect _any_ code which runs under
> "if (group_dead)". Again, I don't see anything wrong, but I didn't even
> try to audit these code paths.

forgot to mention...

and any code outside of do_exit() which checks signal->live.

Oleg.