[root@hathor ~]# systemctl status kojid
● kojid.service - Koji build server
   Loaded: loaded (/usr/lib/systemd/system/kojid.service; disabled; vendor preset: disabled)
   Active: active (running) since Wed 2016-04-13 01:08:35 UTC; 3 days ago
     Docs: https://fedoraproject.org/wiki/Koji/ServerHowTo
 Main PID: 25491 (kojid)
    Tasks: 1 (limit: 512)
   CGroup: /system.slice/kojid.service
           └─25491 /usr/bin/python /usr/sbin/kojid --fg --force-lock --verbose

Apr 16 19:08:39 hathor.ausil.us kojid[25491]: 2016-04-16 19:08:39,282 [ERROR] {25491} koji.build:137 Traceback (most recent call last):
Apr 16 19:08:39 hathor.ausil.us kojid[25491]:   File "/usr/sbin/kojid", line 120, in main
Apr 16 19:08:39 hathor.ausil.us kojid[25491]:     tm.updateBuildroots()
Apr 16 19:08:39 hathor.ausil.us kojid[25491]:   File "/usr/lib/python2.7/site-packages/koji/daemon.py", line 515, in updateBuildroots
Apr 16 19:08:39 hathor.ausil.us kojid[25491]:     db_br = self.session.listBuildroots(hostID=self.host_id,state=tuple(states))
Apr 16 19:08:39 hathor.ausil.us kojid[25491]:   File "/usr/lib/python2.7/site-packages/koji/__init__.py", line 1730, in __call__
Apr 16 19:08:39 hathor.ausil.us kojid[25491]:     return self.__func(self.__name,args,opts)
Apr 16 19:08:39 hathor.ausil.us kojid[25491]:   File "/usr/lib/python2.7/site-packages/koji/__init__.py", line 2109, in _callMethod
Apr 16 19:08:39 hathor.ausil.us kojid[25491]:     raise err
Apr 16 19:08:39 hathor.ausil.us kojid[25491]: AuthError: Invalid session or bad credentials

for some reason the session was invalidated. kojid should make a new session when this happens and not hang.