top command, what "uwait" state means?

Hello folks,
a couple of days ago I started a rclone command to syncronize data from my local system to Google Cloud Storage but the process is always in the UWAIT state while the value of the TIME and WCPU columns changes
this's the output of the top command:

PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
27848 root 17 25 0 995M 324M uwait 3 31:51 2.41% rclone

I would like to know what the state "uwait" means.
Can someone help me?
A thousand thanks.
Best regards.
Dario
 
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