[Devel] Re: [PATCH 1/15] Move exit_task_namespaces()

[Oleg Nesterov]

On 07/26, Pavel Emelyanov wrote:
>
> The reason to release namespaces after reparenting is that when task
> exits it may send a signal to its parent (SIGCHLD), but if the parent
> has already exited its namespaces there will be no way to decide what
> pid to dever to him - parent can be from different namespace.

I almost forgot about this one...

After reading the whole series, I can't understand the above explanation
any longer. The parent can't be from different namespace, either we have
another sub-thread, or we reparent the child to /sbin/init which should
be from the same namespace.

If we are /sbin/init, we kill all tasks from the same namespace before
doing exit_notify().

Could you clarify?

Oleg.