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unix.CPUSet is limited to 1024 CPUs. Calling unix.SchedSetaffinity(pid, cpuset) removes all CPUs starting from 1024 from allowed CPUs of pid, even if cpuset is all ones. As a consequence, when runc tries to reset CPU affinity to "allow all" by default, it prevents all containers from CPUs 1024 onwards. This change uses a huge CPU mask to play safe and get all possible CPUs enabled with a single sched_setaffinity call. Fixes: #5023 Signed-off-by: Antti Kervinen <antti.kervinen@intel.com>