Python Process Died Exit Code -11

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I have a node, "ReceiveOrder.py", that is run via a roslaunch file and unexpectedly dies when I run it.

I have two clues to offer:

1) The following is part of what I see in the roslaunch terminal window. You'll see that exit code -11 is shown. What does this mean? I don't see anything else that is more specific in this runtime feedback

NODES
  /
    ReceiveOrder (robot_arm/ReceiveOrder.py)
    rviz_HPLaptop_4443_4042809988877892707 (rviz/rviz)

ROS_MASTER_URI=http://localhost:11311

core service [/rosout] found
process[ReceiveOrder-1]: started with pid [4461]
process[rviz_HPLaptop_4443_4042809988877892707-2]: started with pid [4462]
[ INFO] [1466968712.255484346]: rviz version 1.11.14
[ INFO] [1466968712.255610062]: compiled against Qt version 4.8.6
[ INFO] [1466968712.255653092]: compiled against OGRE version 1.8.1 (Byatis)
[ INFO] [1466968712.466849981]: Stereo is NOT SUPPORTED
[ INFO] [1466968712.467064489]: OpenGl version: 2.1 (GLSL 1.2).
[ReceiveOrder-1] process has died [pid 4461, exit code -11, cmd /home/daalt/ar01/src/robot_arm/ReceiveOrder.py __name:=ReceiveOrder __log:=/home/daalt/.ros/log/1300bd8c-3bcf-11e6-8a67-002315aba7e4/ReceiveOrder-1.log].
log file: /home/daalt/.ros/log/1300bd8c-3bcf-11e6-8a67-002315aba7e4/ReceiveOrder-1*.log

2) I only see [INFO] messages in the ReceiveOrder-1.log file, no warnings or errors. However there is this line that suggests that something is going on with the rospy clock:

[rospy.simtime][INFO] 2016-06-26 14:18:32,722: /use_sim_time is not set, will not subscribe to simulated time [/clock] topic

The only place where the question of clock comes into question, as far as I know, is when I define a spin rate in the "ReceiveOrder.py" Python node.

I'm not sure what direction to go in based on these clues. Does anyone suspect something specific going on here or, at least, suggest something I can do to investigate further?

Thank you, ROS community!!