JointTrajectoryAction gives success status when robot is run-stopped [closed]

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When the (PR2) robot is run-stopped and clearly has the wrong joint angles, actionlib returns a success status for the action. (set_joints function prints "Success"). Is this a bug?

class Head:
    def set_joints(self,pan,tilt,time_from_start=1.5,blocking=True):
        traj = JointTrajectory()    
        traj.joint_names = ['head_pan_joint','head_tilt_joint']
        traj.points.append(JointTrajectoryPoint(positions=(pan,tilt),time_from_start=rospy.Duration(time_from_start)))

        controller = 'head_traj_controller'
        client = actionlib.SimpleActionClient(find_action("/"+controller), JointTrajectoryAction)
        client.wait_for_server()
        g = JointTrajectoryGoal()
        g.trajectory = traj
        client.send_goal(g)
        print "sent goal for controller",controller

        if blocking:
            try:
                client.wait_for_result()
            except KeyboardInterrupt:
                client.cancel_goal()
                raise

            if client.get_state() == GoalStatus.SUCCEEDED:
                print "Success"
            else:
                print "Failure"

elsewhere in code,

head = Head()    
head.set_joints(0,.75)