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Unfortunately I don't have a solution, but I'm dealing with the same issue. It is really confusing and there seems to be no documentation concerning this. Did you manage to resolve this?

Perhaps if we brainstorm what we tried, we will be able to move forward.

1. Did you enable debugging in your launch file? If you're launching a whole move group, you can find this option in the move_group.launch on the top.

2. This above step requires a gdb_settings.gdb file. This is referring to this type of input apparently.

3. In my case I have (not sure how) managed to activate a process gdb -x gdb_settings.gdb ... move_group... to which I can attach using gdb attach <process id>. However trying to explore with info functions doesn't show any functions relevant to ROS or MoveIt! or anything such.