Description of problem:

# reboot
Failed to start reboot.target: Access denied

The same symptoms as Bug 1229416 but with a much newer version
of systemd.

Version-Release number of selected component (if applicable):

systemd-225-1.fc24.x86_64

How reproducible:

100%

Steps to Reproduce:
1. Use the 'reboot' command.

Seems like it might be an SELinux issue:

Sep 04 15:59:46 rawhide polkitd[677]: Registered Authentication Agent for unix-process:19993:4295918 (system bus name :1.93 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_GB.UTF-8)
Sep 04 15:59:46 rawhide audit[1]: USER_AVC pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  { start } for auid=1000 uid=0 gid=0 path="/usr/lib/systemd/system/reboot.target" cmdline="reboot" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=system_u:object_r:power_unit_file_t:s0 tclass=service
                                   exe="/usr/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?'
Sep 04 15:59:46 rawhide polkitd[677]: Unregistered Authentication Agent for unix-process:19993:4295918 (system bus name :1.93, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_GB.UTF-8) (disconnected from bus)

audit2allow says:

#============= unconfined_t ==============

#!!!! This avc is allowed in the current policy
allow unconfined_t power_unit_file_t:service start;