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Fix lock order inversion between GraphListener and Context (ABI compatible backport) (backport #3239) - #3241

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Fix lock order inversion between GraphListener and Context (ABI compatible backport) (backport #3239)#3241
mergify[bot] wants to merge 1 commit into
humblefrom
mergify/bp/humble/pr-3239

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@mergify mergify Bot commented Aug 28, 2026

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Description

Avoids inverting lock order between GraphListener::start_if_not_started() and Context::shutdown() by registering the on_shutdown_callback before acquiring shutdown_mutex_. To avoid duplicate callback registration, a check has been added such that the shutdown callback is de-registered if this thread wasn't the one that started the graph listener (or, if shutting down, throw GraphListenerShutdownError.)

Tested against my jazzy container with my reproducing example from #2946. The diff ought to cleanly apply to kilted and humble as well.

Fixes #2946 / #3232 for humble / jazzy / kilted

Is this user-facing behavior change?

no

Did you use Generative AI?

Claude Fable 5

Additional Information

This is an automatic backport of pull request #3239 done by [Mergify](https://mergify.com).

@skyegalaxy Skyler Medeiros @mergify
register shutdown callback without shutdown mutex (#3239)
84b0d27 
Signed-off-by: Skyler Medeiros <skye@polymathrobotics.com>
Co-authored-by: Skyler Medeiros <skye@polymathrobotics.com>
(cherry picked from commit efb669e)
@mergify mergify Bot mentioned this pull request Aug 28, 2026
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@skyegalaxy

skyegalaxy commented Aug 28, 2026

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Pulls: #3241
Gist: https://gist.githubusercontent.com/skyegalaxy/ba7d26dbc1305fd3a9665b4bff41a024/raw/6387fb25f5777ac6c5926e747932e5da1712bd09/ros2.repos
BUILD args: --packages-above-and-dependencies rclcpp
TEST args: --packages-above rclcpp
ROS Distro: humble
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/20266

  • Linux Build Status
  • Linux-aarch64 Build Status
  • Linux-rhel Build Status
  • Windows Build Status

@skyegalaxy

skyegalaxy commented Aug 31, 2026 •
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Pulls: #3241
Gist: https://gist.githubusercontent.com/skyegalaxy/b91fd8a9f2d85dc531f2e7f55f461a62/raw/6387fb25f5777ac6c5926e747932e5da1712bd09/ros2.repos
BUILD args: --packages-above-and-dependencies rclcpp
TEST args: --packages-above rclcpp
ROS Distro: humble
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/20286

  • Linux Build Status
  • Linux-aarch64 Build Status
  • Linux-rhel Build Status (10171 -> 10174)
  • Windows Build Status

@skyegalaxy skyegalaxy self-assigned this Sep 3, 2026
@skyegalaxy

skyegalaxy commented Sep 3, 2026

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@fujitatomoya @ahcorde - the rhel failures look like they're not related. shall I go ahead and merge?
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@fujitatomoya fujitatomoya fujitatomoya approved these changes

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