If the upgrade does not complete successfully because a service fails to stop, you can attempt to correct the error by forcing the service to shut down, so that the upgrade process can resume.
The GDU Upgrade Software task cannot complete if the server is prevented from shutting down because a service fails to stop. When this occurs, the GDU Upgrade Software task stops at the "Stopping services" stage and manual intervention is required to stop the service.
Allow 30 minutes to elapse for the service to complete processing before concluding that the service is hung, and the following troubleshooting steps are required.