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I found this: https://wiki.python.org/moin/DebuggingWithGdb

I installed the Python debug package (Ubuntu 20.04):

$ sudo apt-get install python3-dbg

If you try to blindly follow the examples, it doesn't work if you just do:

$ gdb -ex r --args ros2 topic /echo ... "/home/$USER/ros2_ws/install/ros2cli/bin/ros2": not in executable format: file format not recognized ...

So you have to run python3 with the actual entrypoint Python file (which you can see in the error message) as the first argument + the rest. You can also use which:

$ gdb -ex r --args python3 `which ros2` topic echo /topic

This seemed to run gdb correctly for me, but with the default RMW implementation there's no segfault, so I can't tell if it actually gives a stack trace, etc. It should, though, according to what I can see in the link above. Let us know if it works!

I found this: https://wiki.python.org/moin/DebuggingWithGdb

I installed the Python debug package (Ubuntu 20.04):

 $ sudo apt-get install python3-dbg

 $ gdb -ex r --args ros2 topic /echo
...
"/home/$USER/ros2_ws/install/ros2cli/bin/ros2": not in executable format: file format not recognized
...

 $ gdb -ex r --args python3 `which ros2` topic echo /topic

I found this: https://wiki.python.org/moin/DebuggingWithGdb

I installed the Python debug package (Ubuntu 20.04):

$ sudo apt-get install python3-dbg

If you try to blindly follow the examples, it doesn't work if you just do:

$ gdb -ex r --args ros2 topic /echo
"/home/$USER/ros2_ws/install/ros2cli/bin/ros2": not in executable format: file format not recognized

So you have to run python3 with the actual entrypoint Python file (which you can see in the error message) as the first argument + the rest. You can also use which to find the Python file corresponding to ros2:

$ gdb -ex r --args python3 `which ros2` topic echo /topic

This seemed to run gdb correctly for me, but with the default RMW implementation there's no segfault, so I can't tell if it actually gives a stack trace, etc. It should, though, according to what I can see in the link above. Let us know if it works!