This happens pretty regularly, but not 100% of the time. I am on Ubuntu 16.04, running Kinetic. I have 24G of memory. Here's the transcript. And by the way this was just after a complete reboot. Can anyone see what might be the problem?
$ roslaunch turtlebot3_gazebo turtlebot3_stage_1.launch ... logging to /home/pitosalas/.ros/log/942077b8-287b-11e9-a84a-002500efe1ca/roslaunch-RpsUbuntu-7244.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.
xacro: Traditional processing is deprecated. Switch to --inorder processing!
To check for compatibility of your document, use option --check-order.
For more infos, see http://wiki.ros.org/xacro#Processing_Order
xacro.py is deprecated; please use xacro instead
started roslaunch server http://10.0.0.95:34165/
SUMMARY
========
PARAMETERS
* /robot_description: , set to ""
[ INFO] [1549284689.210024510]: Laser Plugin: Using the 'robotNamespace' param: '/'
[ INFO] [1549284689.210149870]: Starting Laser Plugin (ns = /)
[ INFO] [1549284689.212003447]: Laser Plugin (ns = /) , set to ""
[ INFO] [1549284689.224401838]: Starting plugin DiffDrive(ns = //)
[ INFO] [1549284689.224532266]: DiffDrive(ns = //): = na
[ INFO] [1549284689.225568816]: DiffDrive(ns = //): =
[ INFO] [1549284689.226709151]: DiffDrive(ns = //): Advertise joint_states
[ INFO] [1549284689.227823957]: DiffDrive(ns = //): Try to subscribe to cmd_vel
[ INFO] [1549284689.232089944]: DiffDrive(ns = //): Subscribe to cmd_vel
[ INFO] [1549284689.233800303]: DiffDrive(ns = //): Advertise odom on odom
[spawn_urdf-4] process has finished cleanly
log file: /home/pitosalas/.ros/log/942077b8-287b-11e9-a84a-002500efe1ca/spawn_urdf-4*.log
Segmentation fault (core dumped)
[gazebo_gui-3] process has died [pid 7293, exit code 139, cmd /opt/ros/kinetic/lib/gazebo_ros/gzclient __name:=gazebo_gui __log:=/home/pitosalas/.ros/log/942077b8-287b-11e9-a84a-002500efe1ca/gazebo_gui-3.log].
log file: /home/pitosalas/.ros/log/942077b8-287b-11e9-a84a-002500efe1ca/gazebo_gui-3*.log
^C[gazebo-2] killing on exit
[gazebo-2] escalating to SIGTERM
[rosout-1] killing on exit
[master] killing on exit
shutting down processing monitor...
... shutting down processing monitor complete
done
pitosalas@RpsUbuntu:~/catkin_ws/src$
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