Bug report

Passing a malformed YAML parameter file crashes nodes without hinting at the cause. The symptoms are the same as #553:

free(): double free detected in tcache 2
Aborted (core dumped)

Required Info:

• Operating System:
  • Ubuntu 20.04
• Installation type:
  • ROS2 deb repo via apt
• Version or commit hash:
  • ros-foxy-rcl 1.1.7-1focal.20200921.18150
• DDS implementation:
  • default
• Client library (if applicable):
  • (rclpy)

Steps to reproduce issue

echo malformed::: > /tmp/settings.yaml
ros2 run <any node> --ros-args --params-file /tmp/settings.yaml

Expected behavior

The user is informed that the YAML file is malformed.

Actual behavior

The program crashes. The user is puzzled and is not told the cause of the crash.