If I press Ctrl-C quickly:

Starting celery with log file  /home/mice/MAUS/maus-apps/media/raw/celeryd.log with pid 24754
Starting maus web app with log file  /home/mice/MAUS/maus-apps/media/raw/maus-web.log with pid 24755
Starting reconstruction with log file  /home/mice/MAUS/maus-apps/media/raw/maus-input-transform.log with pid 24756
Starting reconstruction with log file  /home/mice/MAUS/maus-apps/media/raw/reconstruct_daq_scalars_reducer.log with pid 24757
Starting reconstruction with log file  /home/mice/MAUS/maus-apps/media/raw/reconstruct_daq_tof_reducer.log with pid 24758
Starting reconstruction with log file  /home/mice/MAUS/maus-apps/media/raw/reconstruct_daq_ckov_reducer.log with pid 24759
Starting reconstruction with log file  /home/mice/MAUS/maus-apps/media/raw/reconstruct_monitor_reducer.log with pid 24760
Making lockfile /home/mice/MAUS/.maus_control-room/tmp/.maus_lockfile

CTRL-C to quit

. . . . . . .
Closing
Exiting... killing all MAUS processes
subprocess CalledProcessError.output = 
Traceback (most recent call last):
  File "bin/analyze_data_online.py", line 303, in <module>
    main()
  File "bin/analyze_data_online.py", line 300, in main
    cleanup()
  File "bin/analyze_data_online.py", line 246, in cleanup
    kill_celery_subprocesses()
  File "bin/analyze_data_online.py", line 237, in kill_celery_subprocesses
    for pid_str in ps_output.split("\n")[:-1]:
UnboundLocalError: local variable 'ps_output' referenced before assignment