See https://github.com/ros2/rclpy/pull/469#discussion_r414247845. Example of a job in CI failing: https://ci.ros2.org/job/ci_osx/8540/testReport/rclpy.src.ros2.rclpy.rclpy.test/test_logging_rosout/test_enable_rosout_enable_global_rosout_enable_node_rosout_True_True_True_/.