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When ROS is shutting down, it drops all connections to the master and afaik thus looses all "ROS"-Functionality. I.e. you cannot

• publish or subscribe to a topic
• call a service or action
• read to or write from the Parameter server
• and apparently all ROS logging does not work either.

If you replace the ROS_INFO with a std::cout, you see that this is actually handled. However, all code with ROS functionality is, in the end, a noop, due to the missing connections.