:farmer: launch_testing_examples.check_msgs_launch_test fails to receive messages on the chatter topic

Generated by Generative AI

No response

Operating System:

Ubuntu noble

ROS version or commit hash:

Kilted

RMW implementation (if applicable):

No response

RMW Configuration (if applicable):

No response

Client library (if applicable):

No response

'ros2 doctor --report' output

No response

Steps to reproduce issue

1. Go to any of the jobs listed below
2. Build a job
3. See test failing

Expected behavior

To build without error

Actual behavior

Building with test regressions

Additional information

Reference Build

• Kci__nightly-cyclonedds_ubuntu_noble_amd64#153
• Kci__nightly-zenoh_ubuntu_noble_amd64#151

Failing tests

• launch_testing_examples.launch_testing_examples.check_msgs_launch_test.launch_testing_examples.check_msgs_launch_test

Log output

=====================================================================================================================================================================
FAIL: launch_testing_examples.check_msgs_launch_test.TestFixture.test_check_if_msgs_published
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/ws/src/ros2/examples/launch_testing/launch_testing_examples/launch_testing_examples/check_msgs_launch_test.py", line 45, in test_check_if_msgs_published
    with WaitForTopics([('chatter', String)], timeout=15.0):
  File "/tmp/ws/install_isolated/launch_testing_ros/lib/python3.12/site-packages/launch_testing_ros/wait_for_topics.py", line 140, in __enter__
    raise RuntimeError('Did not receive messages on these topics: ',
RuntimeError: ('Did not receive messages on these topics: ', {'chatter'})

Flakyness 15 days

job_name	last_fail	first_fail	build_count	failure_count	failure_percentage
Kci__nightly-zenoh_ubuntu_noble_amd64	2026-09-13	2026-09-08	2	2	100.0
Kci__nightly-cyclonedds_ubuntu_noble_amd64	2026-09-13	2026-09-07	3	3	100.0

Began to fail in https://build.ros2.org/job/Kci__nightly-cyclonedds_ubuntu_noble_amd64/106, but checking for changes I can't find a specific reason