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Create a child in new pid_ns; then the child creats thread and zombie.
Zombie is in the second created new pid_ns. Then the great parent
setns() to its active pid_ns. So, lets draw the table:
pid_ns vs pid_for_children_ns
great parent: equal
child: not equal
child thread: equal
grand child zombie: zombies don't have pid_for_children_ns
After signal chech that everything remains the same.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
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