Il giorno mar, 20/11/2018 alle 08.02 -0800, Gordon Messmer ha scritto:
Use "exec reboot" instead of "reboot".  Close all of your other active 
shells before you do.

Ok, thank, this can be a possible solution
but it will be difficult to avoid the habit of writing only "reboot" ... to lose last history is very annoyng

Why this kind of problem occur only some time?

Has anyone had this kind of problem?

I must fill a bug?

IMHO:
Seem this problem occur only on Fedora Server
On Centos 7 this kind of problem has never happened (to me).

Thanks

-- 
Dario Lesca
(inviato dal mio Linux Fedora 28 Workstation)