[6.8.3] Stop array gets stuck if dockers are still doing a timed start

I have many dockers that have delays to start when the array comes up. If I send a stop array command before they have finished coming up, the system gets stuck trying to shut down the array. Checking on the command line, none of the array drives are mounted except the cache because the docker.img is still mounted. Manually unmounting docker.img seems to allow the system to gracefully continue the stop array.