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

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Date:   Thu, 25 Mar 2021 11:00:11 +0800
From:   qianli zhao <zhaoqianligood@...il.com>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     christian@...uner.io, axboe@...nel.dk,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        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

>> But,my patch has another purpose,protect some key variables(such
>> as:task->mm,task->nsproxy,etc) to recover init coredump from
>> fulldump,if sub-threads finish do_exit(),

> Yes I know.

> But the purpose of this SIGNAL_GROUP_EXIT check is not clear and not
> documented. That is why I said it should be documented at least in the
> changelog.

Ok.
I will update the changelog as you suggest.

Oleg Nesterov <oleg@...hat.com> 于2021年3月25日周四 上午2:12写道：
>
> Hi,
>
> On 03/23, qianli zhao wrote:
> >
> > Hi,Oleg
> >
> > > You certainly don't understand me :/
> >
> > > Please read my email you quoted below. I didn't mean the current logic.
> > > I meant the logic after your patch which moves atomic_dec_and_test() and
> > > panic() before exit_signals().
> >
> > Sorry, I think I see what you mean now.
> >
> > You mean that after apply my patch,SIGNAL_GROUP_EXIT no longer needs
> > to be tested or avoid zap_pid_ns_processes()->BUG().
> > Yes,your consideration is correct.
>
> OK, great
>
> > But,my patch has another purpose,protect some key variables(such
> > as:task->mm,task->nsproxy,etc) to recover init coredump from
> > fulldump,if sub-threads finish do_exit(),
>
> Yes I know.
>
> But the purpose of this SIGNAL_GROUP_EXIT check is not clear and not
> documented. That is why I said it should be documented at least in the
> changelog.
>
> Oleg.
>