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In the function listener, you make a call to rospy.spin(). This function blocks until the node is terminated, so listener is blocked. CTRL-C caused spin() to return, but you then also get stuck inside the while True loop. The overall control flow of this program needs rework, and I recommend doing a refresher run through the ROS tutorial series to review concepts such as spinning.

Also, CTRL-Z suspends the process rather than terminating it.