Sometimes a subsystem hangs in the user code. This could be caused by a loop, or an unsatisfied WAIT. Regardless of the reason, all NCL processes waiting on a call may wait indefinitely. This is especially likely while developing subsystem code. To find out whether the subsystem has hung, use the SHOW SUBSYS command.
You can stop a hung subsystem with the SUBSYS FORCE command. The subsystem is force-detached, cleaned up and then assumes the STOP status.
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