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Debugging
3wnbr1 edited this page May 9, 2020
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1 revision
Run your python script in interactive mode
python3 -i myscript.py
In case you're getting nasty errors like
[INFO] [tree]: waiting for action server ... [NavigateToPose][FromConstant/Move]
[INFO] [tree]: ... connected to action server [NavigateToPose][FromConstant/Move]
Segmentation fault
Insert this snippet on top of you faulty script
import faulthandler; faulthandler.enable()
Now run your script with
python3 -X faulthandler myscript.py
You now get a Stacktrace 🎉
[INFO] [tree]: waiting for action server ... [NavigateToPose][FromConstant/Move]
[INFO] [tree]: ... connected to action server [NavigateToPose][FromConstant/Move]
Fatal Python error: Segmentation fault
Thread 0x0000007f53fff1f0 (most recent call first):
File "/usr/lib/python3.6/threading.py", line 299 in wait
File "/usr/lib/python3.6/threading.py", line 551 in wait
File "/usr/lib/python3.6/threading.py", line 1180 in run
File "/usr/lib/python3.6/threading.py", line 916 in _bootstrap_inner
File "/usr/lib/python3.6/threading.py", line 884 in _bootstrap
Current thread 0x0000007fab3dd010 (most recent call first):
File "/opt/ros/eloquent/lib/python3.6/site-packages/rclpy/node.py", line 1158 in create_subscription
File "/opt/ros/eloquent/lib/python3.6/site-packages/py_trees_ros/subscribers.py", line 119 in setup
File "/opt/ros/eloquent/lib/python3.6/site-packages/py_trees/trees.py", line 93 in visited_setup
File "/opt/ros/eloquent/lib/python3.6/site-packages/py_trees/trees.py", line 112 in setup
File "/opt/ros/eloquent/lib/python3.6/site-packages/py_trees/trees.py", line 322 in setup
File "/opt/ros/eloquent/lib/python3.6/site-packages/py_trees_ros/trees.py", line 427 in setup
File "actions.py", line 235 in main
File "actions.py", line 261 in <module>
Segmentation fault
Happy Debugging...
Coming soon...
Divers