CUPS Printer Page showing "Idle - Waiting for printer to finish." message for most printers and does not refresh

Issue

• An "Idle - Waiting for printer to finish." message displays on the CUPS Printer page and does not refresh, even though the print job completed hours earlier. This behavior is across the board, it's happening to any of the 100 printers we have configured in production.

• After we print a file, "lpstat -t" shows "Waiting for printer to finish" message. We checked and there was nothing in the queue. If we restart the CUPS service, the message will go away.

  $ lpstat -p pr123
  printer pr123 is idle.  enabled since Mon 14 Mar 2016 04:45:15 PM PDT
  
  $ lp -d pr123 /etc/group
  request id is pr123-6 (1 file(s))
  
  $ lpstat –o
  
  $ lpstat -p pr123
  printer pr123 is idle.  enabled since Mon 14 Mar 2016 05:06:57 PM PDT
          Waiting for printer to finish.
  
  $ sudo systemctl restart cups.service
  $ lpstat -p pr123
  printer pr123 is idle.  enabled since Mon 14 Mar 2016 04:45:15 PM PDT