[cartographer_node-3] process has died [pid 10132, exit code -6

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I am trying to get the cartographer to work on my platform running ubuntu18.04 and ROS melodic. I have modified the configuration file and urdf to accept a laser scan. The urdf and config file sis attached. For some reason, the cartographer_node crashes with an exit code -6. The terminal is as given below.

wh@wh--Y7000:~/catkin_ws$ roslaunch cartographer_ros demo_my_robot.launch bag_filename:=${HOME}/Downloads/out_2019-06-18-10-09-07.bag
... logging to /home/wh/.ros/log/943fa3f0-b5c4-11e9-8f21-8c1645e9392a/roslaunch-wh--Y7000-10103.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://wh--Y7000:41385/

SUMMARY
========

PARAMETERS
 * /robot_description: <...>
 * /rosdistro: melodic
 * /rosversion: 1.14.3
 * /use_sim_time: True

NODES
  /
    cartographer_node (cartographer_ros/cartographer_node)
    cartographer_occupancy_grid_node (cartographer_ros/cartographer_occupancy_grid_node)
    playbag (rosbag/play)
    robot_state_publisher (robot_state_publisher/robot_state_publisher)
    rviz (rviz/rviz)

auto-starting new master
process[master]: started with pid [10113]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to 943fa3f0-b5c4-11e9-8f21-8c1645e9392a
process[rosout-1]: started with pid [10124]
started core service [/rosout]
process[robot_state_publisher-2]: started with pid [10128]
process[cartographer_node-3]: started with pid [10132]
process[cartographer_occupancy_grid_node-4]: started with pid [10133]
process[rviz-5]: started with pid [10139]
process[playbag-6]: started with pid [10146]
[ INFO] [1564819152.334285584]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer_ros/configuration_files/my_robot3d.lua' for 'my_robot3d.lua'.
[ INFO] [1564819152.335315105]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer/configuration_files/map_builder.lua' for 'map_builder.lua'.
[ INFO] [1564819152.335358026]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer/configuration_files/map_builder.lua' for 'map_builder.lua'.
[ INFO] [1564819152.335468322]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer/configuration_files/pose_graph.lua' for 'pose_graph.lua'.
[ INFO] [1564819152.335512335]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer/configuration_files/pose_graph.lua' for 'pose_graph.lua'.
[ INFO] [1564819152.335634632]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer/configuration_files/trajectory_builder.lua' for 'trajectory_builder.lua'.
[ INFO] [1564819152.335687720]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer/configuration_files/trajectory_builder.lua' for 'trajectory_builder.lua'.
[ INFO] [1564819152.335770674]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer/configuration_files/trajectory_builder_2d.lua' for 'trajectory_builder_2d.lua'.
[ INFO] [1564819152.335837415]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer/configuration_files/trajectory_builder_2d.lua' for 'trajectory_builder_2d.lua'.
[ INFO] [1564819152.335965318]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer/configuration_files/trajectory_builder_3d.lua' for 'trajectory_builder_3d.lua'.
[ INFO] [1564819152.335999089]: I0803 15:59:12.000000 10132 configuration_file_resolver.cc:41] Found '/home/wh/catkin_ws/install_isolated/share/cartographer/configuration_files/trajectory_builder_3d.lua' for 'trajectory_builder_3d.lua'.
[ INFO] [1564819152.340214057]: I0803 15:59:12.000000 10132 submap_3d.cc:321] Added submap 1
[ INFO] [1564819152.340278976]: I0803 15:59:12.000000 10132 map_builder_bridge.cc:130] Added trajectory with ID '0'.
[ INFO] [1564819152 ...