00
In productionProadvancedExecutor deadlock
The prepare-pick trigger deadlocks the supervisor
Make /prepare_pick return by letting the supervisor process the /reset_gripper response while its trigger callback is blocked, without switching to call_async.
Pairs with Executors and callback timing in ROS 2 Systems Debugging. Read the concept first, then diagnose it here.
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/prepare_pick is advertised, but calling it never returns; the supervisor hangs with no error.
Ubuntu 24.04, ROS 2 Jazzy, Python and C++ nodes, browser telemetry workspace
System boundary
Trace only the relevant path.
- 01/prepare_pick trigger→
- 02single-threaded executor→
- 03/reset_gripper responseOUT
02
How this lab works
You diagnose it. No command list.
Open the repair workspace and gather your own evidence in a real terminal. No diagnostic commands are handed to you - finding the fault is the exercise. Stuck? Progressive hints unlock inside the workspace.
Verification
Pass more than the visible symptom.
- prepare_pick returns without deadlock
- prepare_pick reports success
- Hidden regression behavior
- Root cause explanation