The unit queues are not serialized/deserialized (they are recreated after reexec/reload instead). The destroyed units are not removed from the cgroup_oom_queue. That means the queue may contain possibly invalid pointers to released units. Fix this by removing the units from cgroup_oom_queue as we do for others. When at it, sync assert checks with currently existing queues and put them in order in the manager cleanup code.
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