Although ROS nodes are actually regular executables, there is a tricky point to enabling core dumps, which can later be used in a gdb session. First of all, we have to set an unlimited core size; the current value can be checked with ulimit -c. Note that this is also required for any executable and not just ROS nodes:
$ ulimit -c unlimited
Then, to allow core dumps to be created, we must set the core filename to use the pid process by default. Otherwise, they will not be created because at $ROS_HOME, there is already a core directory to prevent core dumps. Therefore, in order to create core dumps with the name and path $ROS_HOME/core.PID, we must run the following command:
$ echo 1 | sudo tee /proc/sys/kernel/core_uses_pid ...
