Win 11 - ros2_multicast test_api regressions on release jobs

[claraberendsen]

Generated by Generative AI

No

Operating System:

Windows 11

ROS version or commit hash:

rolling

RMW implementation (if applicable):

No response

RMW Configuration (if applicable):

No response

Client library (if applicable):

No response

'ros2 doctor --report' output

Steps to reproduce issue

1. Execute a build of Windows 2025 release nightly on ci.ros2.org
2. See it fail

Expected behavior

Tests not to fail since on Windows 10 nightlies there is no regression

Actual behavior

Error for all failing tests

OSError: [WinError 10055] An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full

Tests failing:
ros2multicast.ros2multicast.test.test_api.test_api
 ros2multicast.ros2multicast.test.test_api.test_group_and_port
 ros2multicast.ros2multicast.test.test_api.test_port_mismatch

Additional information

• A quick google search did not point to any difference in port range being different from Windows Server 2022 to Windows Server 2025.
• It is failing consistently since https://ci.ros2.org/job/nightly_win-2025_release/67/.
• Looking at the logs I think this might be an issue with other things running in parallel to this putting more strain on the system.
  The logs shows these test suites were running in parallel: ros2multicast,rosbag2_performance_benchmarking, rosbag2_tests, sros2

[miguelgonrod]

Hi!! This error is appearing again

Reference Build

• nightly_win_rep#4211

Failing tests

• ros2multicast.ros2multicast.test.test_api.test_api[1-3]
• ros2multicast.ros2multicast.test.test_api.test_api[2-3]
• ros2multicast.ros2multicast.test.test_api.test_api[3-3]
• ros2multicast.ros2multicast.test.test_api.test_group_and_port[1-3]
• ros2multicast.ros2multicast.test.test_api.test_group_and_port[2-3]
• ros2multicast.ros2multicast.test.test_api.test_group_and_port[3-3]
• ros2multicast.ros2multicast.test.test_api.test_port_mismatch[1-3]
• ros2multicast.ros2multicast.test.test_api.test_port_mismatch[2-3]
• ros2multicast.ros2multicast.test.test_api.test_port_mismatch[3-3]

Log Output

ros2multicast/test/test_api.py::test_port_mismatch[3-3]

  Warning: Exception in thread Thread-24 (target)

  

  Traceback (most recent call last):

    File "C:\pixi_ws\.pixi\envs\default\Lib\threading.py", line 1073, in _bootstrap_inner

      self.run()

    File "C:\pixi_ws\.pixi\envs\default\Lib\threading.py", line 1010, in run

      self._target(*self._args, **self._kwargs)

    File "C:\ci\ws\src\ros2\ros2cli\ros2multicast\test\test_api.py", line 32, in target

      received_data, _ = receive(**rx_kwargs)

                         ^^^^^^^^^^^^^^^^^^^^

    File "C:\ci\ws\src\ros2\ros2cli\ros2multicast\ros2multicast\api\__init__.py", line 47, in receive

      s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)

  OSError: [WinError 10055] An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full

Flakyness 15 days

job_name	last_fail	first_fail	build_count	failure_count	failure_percentage
nightly_win_rep	2026-08-26	2026-08-13	4	4	100.0