It is quiet a common case to move the process from one pidns to another
existing pidns with criu (only restriction is pids should not
intersect). Let's check it works.
v2: - use pipe-s to synchronize processes
- run the test in a pid namespace to avoid pid conflicts in the host
pid namespace
- grep errors in restore.log
- add some more comments
v3: use 1000 for ns_last_pid so that test works on systems with low
pid_max; remove excess ';'s.
Co-Developed-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
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