Comment # 21 on bug 954908 from Thomas Blume

Created attachment 658788 [details]
screenshot of hanging reboot

See attached screenshot.
The loop is here:

YaST2-Second-Stage service executes: rcnetwork start
This gets translated to a start of wicked.
But wicked is waiting for YaST2-Second-Stage service to finish.

IMHO, YaST2-Second-Stage shouldn't do an explicit network start.
Instead some dependencies should be added that starts
YaST2-Second-Stage.service after wicked.