Someone else recently posted an issue with only being to log in with a GM account.
Have you tried giving a user account status and logging in?
If you can get in that way, it definitely means your world server is in a 'locked' condition rather than 'not working.'
EDIT:
Odd... signal '2' is the result of a 'called' shutdown it seems.
I see 3 possible calls for that signal in project 'world' and not seeing anything in your log to indicate a malfunction just yet.
EDIT2:
Quote:
[02-10-2018 :: 15:04:00] [World Server] New Query Server connection from 217f4acb-2b14-4588-8f5a-468082b46ee0 at 127.0.0.1:50300
[02-10-2018 :: 15:36:48] [World Server] Removed Query Server connection from 217f4acb-2b14-4588-8f5a-468082b46ee0
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My world logs have zone server connections between those two entries.