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🧑🌾 Flaky EventsCBGExecutor test: reentrant callback group fails to run callbacks concurrently #3328
Description
Generated by Generative AI
No response
Operating System:
ubuntu Lyrical mainly (flaky in the other ubuntu distros)
ROS version or commit hash:
Lyrical (with presence on kilted and 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
- Go to https://build.ros2.org/job/Lci__nightly-debug_ubuntu_resolute_amd64
- Build a job
- See test failing
Expected behavior
Build without test regressions
Actual behavior
Building with some regressions
Additional information
Reference Build
Failing tests
- projectroot.test.rclcpp.test_events_cbg_executor_reentrant
- rclcpp.TestEventsCBGExecutorReentrant.reentract_callback_group_runs_concurrently
Log output
/tmp/ws/src/ros2/rclcpp/rclcpp/test/rclcpp/executors/test_events_cbg_executor_reentrant.cpp:121
Value of: sub2_timed_out.load()
Actual: true
Expected: false
sub 2 timed out waiting for sub 1 to start running -- the reentrant callback group appears to be serialized
Flakyness 15 days
| job_name | last_fail | first_fail | build_count | failure_count | failure_percentage |
|---|---|---|---|---|---|
| nightly_linux-rhel_debug | 2026-10-11 | 2026-09-15 | 28 | 13 | 46.43 |
| Lci__nightly-debug_ubuntu_resolute_amd64 | 2026-10-10 | 2026-09-14 | 8 | 8 | 100.0 |
| Kci__nightly-debug_ubuntu_noble_amd64 | 2026-10-09 | 2026-09-25 | 6 | 4 | 66.67 |
| nightly_linux-aarch64_debug | 2026-10-03 | 2026-09-13 | 29 | 2 | 6.9 |
| nightly_linux_debug | 2026-10-01 | 2026-09-14 | 31 | 15 | 48.39 |
| Rci__nightly-debug_ubuntu_resolute_amd64 | 2026-09-23 | 2026-09-15 | 23 | 6 | 26.09 |
I think that https://github.com/ros2/rclcpp/pull/3178 and https://github.com/ros2/rclcpp/pull/3288 could be related to this issue
Activity
skyegalaxy commentedon Oct 20, 2026
possibly fixed by #3288