controller_manager spawner dies after spawning

edit

It was working fine for loading controller for Gazebo and then after doing sudo apt-get upgrade (that I think installed some extra gazebo stuff), it started crashing. (disk34_tran is the last controller in my list, so all controllers are loaded correctly)

[/maru/maru_controller INFO 4.373000]: Controller Spawner: Loaded controllers: joint_state_controller, clamp_tran, belt1_tran, belt2_tran, z_tran, yaw_tran, height_tran, rad_tran, pusher_tran, drive_tran, fixed_drive_tran, eject_drive_tran, disk0_tran, disk1_tran, disk2_tran, disk3_tran, disk4_tran, disk5_tran, disk6_tran, disk7_tran, disk8_tran, disk9_tran, disk10_tran, disk11_tran, disk12_tran, disk13_tran, disk14_tran, disk15_tran, disk16_tran, disk18_tran, disk19_tran, disk20_tran, disk21_tran, disk22_tran, disk23_tran, disk24_tran, disk25_tran, disk26_tran, disk27_tran, disk28_tran, disk29_tran, disk30_tran, disk31_tran, disk32_tran, disk33_tran, disk17_tran, disk34_tran
Traceback (most recent call last):
  File "/opt/ros/indigo/lib/controller_manager/spawner", line 212, in <module>
    if __name__ == '__main__': main()
  File "/opt/ros/indigo/lib/controller_manager/spawner", line 204, in main
    resp = switch_controller(loaded, [], 2)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rospy/impl/tcpros_service.py", line 435, in __call__
Segmentation fault
[gazebo-2] process has died [pid 4012, exit code 139, cmd /opt/ros/indigo/lib/gazebo_ros/gzserver worlds/empty.world __name:=gazebo __log:=/home/mehdi/.ros/log/40838168-0520-11e5-9545-48d2245dedaf/gazebo-2.log].
log file: /home/mehdi/.ros/log/40838168-0520-11e5-9545-48d2245dedaf/gazebo-2*.log
    return self.call(*args, **kwds)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rospy/impl/tcpros_service.py", line 525, in call
    raise ServiceException("transport error completing service call: %s"%(str(e)))
rospy.service.ServiceException: transport error completing service call: unable to receive data from sender, check sender's logs for details
[/maru/maru_controller INFO 4.374000]: Shutting down spawner. Stopping and unloading controllers...
[/maru/maru_controller WARN 4.374000]: Controller Spawner couldn't reach controller_manager to take down controllers. Waited for 30 second(s).

What could be the reason for this crash and how to fix it?