:farmer: test_launch_ros: Intermittent test failures due to "Too many open files"

[miguelgonrod]

Generated by Generative AI

No response

Operating System:

Ubuntu Resolute

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

No response

Steps to reproduce issue

1. Go to https://ci.ros2.org/job/nightly_linux-aarch64_repeated
2. Build a job
3. See test failing

Expected behavior

To build without test regressions

Actual behavior

Building with test regressions

Additional information

Reference Build

• nightly_linux-aarch64_repeated#3667

Failing tests

Click to see all

test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-single_threaded-2-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-single_threaded-3-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-multi_threaded-1-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-multi_threaded-2-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-multi_threaded-3-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-events_cbg-1-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-events_cbg-2-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-events_cbg-3-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-multi_threaded_num_threads-1-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-multi_threaded_num_threads-2-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-multi_threaded_num_threads-3-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-events_cbg_num_threads-1-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-events_cbg_num_threads-2-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-events_cbg_num_threads-3-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-isolated-1-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-isolated-2-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-isolated-3-3]
test_launch_ros.test.test_launch_ros.frontend.test_component_container.test_launch_container_executor_modes[yaml-single_threaded_isolated-1-3]

Log Output

AssertionError: assert 0 == 1

Task.result() returned 1 instead of 0.

Captured stdout:
[INFO] [launch]: All log files can be found below:
    /home/rosbuild/.ros/log/2026-08-20-07-53-09-240900-a2beb6ae246a-493915

[INFO] [launch]: Default logging verbosity is set to INFO

[ERROR] [launch]: Caught exception in launch:
    [Errno 24] Too many open files: '/tmp/launch_params_o_h7sav7'

Test:
    test_launch_container_executor_modes[yaml-events_cbg_num_threads-2-3]

File:
    test/test_launch_ros/frontend/test_component_container.py:192

Flakyness 15 days

job_name	last_fail	first_fail	build_count	failure_count	failure_percentage
nightly_linux-aarch64_repeated	2026-08-20	2026-08-14	13	6	46.15
nightly_linux_repeated	2026-08-17	2026-08-14	12	4	33.33

Began to happen in https://ci.ros2.org/job/nightly_linux-aarch64_repeated/3660.

Checking commit changes could be caused by https://github.com/ros2/launch_ros/pull/563 but not sure

CC: @Crola1702