Comment # 2 on bug 1200977 from Franck Bui

Can you see the same behavior with `reboot -f` ?

If not, can you try to reproduce your problem with debug logs enabled when
rebooting your system ?

You can find some info about how to retrieve some debug logs during shutdown
here:
https://freedesktop.org/wiki/Software/systemd/Debugging/#diagnosingshutdownproblems