ros2doctor test_api.py hanging during nightly linux repeated jobs.

Bug report

Required Info:

• Operating System:
  • Ubuntu Focal
  • RHEL 8
• Installation type:
  • source
• Version or commit hash:
  • https://gist.github.com/nuclearsandwich/ee0b27ec978bdc3e40d0fb8cd52edf26#file-nightly_linux_repeated-2549-repos
• DDS implementation:
  • cyclonedds (presumably)
• Client library (if applicable):
  • N/A

The following jobs hung indefinitely (upwards of 24 hours in some cases) with the last output being ros2doctor’s test_api.py tests.

Starting >>> ros2doctor
07:28:05 ============================= test session starts ==============================
07:28:05 platform linux -- Python 3.8.10, pytest-6.2.5, py-1.11.0, pluggy-1.0.0
07:28:05 cachedir: /home/jenkins-agent/workspace/nightly_linux_repeated/ws/build/ros2doctor/.pytest_cache
07:28:05 rootdir: /home/jenkins-agent/workspace/nightly_linux_repeated/ws/src/ros2/ros2cli, configfile: pytest.ini
07:28:05 plugins: launch-testing-ros-0.17.0, launch-testing-0.21.0, ament-xmllint-0.11.4, ament-copyright-0.11.4, ament-pep257-0.11.4, ament-flake8-0.11.4, ament-lint-0.11.4, mock-3.7.0, rerunfailures-10.2, cov-3.0.0, repeat-0.9.1, colcon-core-0.7.1
07:28:06 collecting ... 
07:28:06 collected 15 items / 12 deselected / 3 selected                                
07:28:06 
07:28:08 test/test_api.py . 

• https://ci.ros2.org/job/nightly_linux-rhel_repeated/1022
• https://ci.ros2.org/job/nightly_linux-rhel_repeated/1023
• https://ci.ros2.org/job/nightly_linux_repeated/2549

[xander-m2k]

Happened today to me as well, trying to build ROS Foxy binaries for Debian Buster, hanging for over an hour on test_cli.py of ros2topic. I just had to wait a little longer, I’m dealing with a somewhat slow build server.

[clalancette]

A wild guess is that the change from CycloneDDS -> Fast-DDS as the default RMW is causing this. If it is reproducible, I’ll suggest running a CI build against a branch where https://github.com/ros2/rmw/pull/315 is reverted to see if it helps.