Oleg Nesterov wrote:
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 the child that is a new namespace's init is exiting its parent is from the
different namespace. Moreover, we will probably want to implement "entering"
the pid namespace, so having tasks with parents from another namespace will
be OK.
If we are /sbin/init, we kill all tasks from the same namespace before
doing exit_notify().
Could you clarify?
Oleg.
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