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

[Oleg Nesterov]

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.