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When pbs_server restarts and recovers a job but cannot find that job's queue, it will create a new queue with the original name, but with a ghost_queue attribute (as seen in qmgr) and then add the job to that queue. This will happen for each queue the server does not recognize. Ghost queues will not accept new jobs, but will allow the jobs in it to run and be in a running state. If users attempt to submit any new jobs to these queues, the user will get an error stating that the queue had an error on recovery, and is in a ghost state. Once the admin reviews and corrects the queue's settings, the admin may remove the ghost setting and then the queue will function normally.
See ghost_queue for more information.