examples time out on CI from time to time #872
Description
Describe the bug
2025-08-11T04:00:39.5306635Z 1 package had stderr output: ros2_control_demo_example_8
2025-08-11T04:00:39.5306987Z 1 package had test failures: ros2_control_demo_example_8
2025-08-11T04:00:39.5307785Z ##[endgroup]
2025-08-11T04:00:39.5308138Z �[32m'run_target_test' returned with code '0' after 20 min 45 sec�[0m
2025-08-11T04:00:39.5308548Z
2025-08-11T04:00:39.5309669Z �[1m$ ( source /opt/ros/kilted/setup.bash && cd /home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws && colcon test-result --verbose; )�[0m
2025-08-11T04:00:39.5311046Z build/ros2_control_demo_example_8/Testing/20250811-0356/Test.xml: 3 tests, 0 errors, 1 failure, 0 skipped
2025-08-11T04:00:39.5311796Z - run_example_8_launch
2025-08-11T04:00:39.5312130Z <<< failure message
2025-08-11T04:00:39.5312365Z -- run_test.py: extra environment variables:
2025-08-11T04:00:39.5312660Z - PYTHONDONTWRITEBYTECODE=1
2025-08-11T04:00:39.5313238Z -- run_test.py: invoking following command in '/home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws/build/ros2_control_demo_example_8':
2025-08-11T04:00:39.5315575Z - /usr/bin/python3 -u -m pytest /home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws/src/ros-controls/ros2_control_demos/example_8/test/test_rrbot_transmissions_system_position_only_launch.py -o cache_dir=/home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws/build/ros2_control_demo_example_8/ament_cmake_pytest/run_example_8_launch/.cache --junit-xml=/home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws/build/ros2_control_demo_example_8/test_results/ros2_control_demo_example_8/run_example_8_launch.xunit.xml --junit-prefix=ros2_control_demo_example_8
2025-08-11T04:00:39.5318167Z ============================= test session starts ==============================
2025-08-11T04:00:39.5318834Z platform linux -- Python 3.12.3, pytest-7.4.4, pluggy-1.4.0
2025-08-11T04:00:39.5319762Z cachedir: build/ros2_control_demo_example_8/ament_cmake_pytest/run_example_8_launch/.cache
2025-08-11T04:00:39.5320628Z rootdir: /home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws
2025-08-11T04:00:39.5322297Z plugins: ament-pep257-0.19.2, ament-xmllint-0.19.2, ament-copyright-0.19.2, launch-testing-ros-0.28.2, ament-lint-0.19.2, launch-testing-3.8.2, ament-flake8-0.19.2, typeguard-4.1.5, cov-4.1.0, colcon-core-0.20.0, rerunfailures-12.0, repeat-0.9.3
2025-08-11T04:00:39.5323615Z collected 1 item
2025-08-11T04:00:39.5323912Z >>>
2025-08-11T04:00:39.5324812Z build/ros2_control_demo_example_8/test_results/ros2_control_demo_example_8/run_example_8_launch.xunit.xml: 1 test, 1 error, 0 failures, 0 skipped
2025-08-11T04:00:39.5325907Z - ros2_control_demo_example_8 run_example_8_launch.xunit.missing_result
2025-08-11T04:00:39.5326436Z <<< error message
2025-08-11T04:00:39.5326742Z The test did not generate a result file.
2025-08-11T04:00:39.5327102Z >>>
2025-08-11T04:00:39.5327237Z
2025-08-11T04:00:39.5327430Z Summary: 5862 tests, 1 error, 1 failure, 1216 skipped
To Reproduce
ros-controls/ros2_control_ci#445