Alea jacta est

CentOS7なんだけど
ぶっちゃけsystemdは最悪や


[root@localhost ~]# umount -f /tmp
umount: /tmp: target is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))


何のための-fオプションなんだか
強制的にアンマウントしろよ
クソ

FreeBSDだとサクッとアンマウントできる

root@test1:/root # umount /tmp
umount: unmount of /tmp failed: Device busy
root@test1:/root # umount -f /tmp
root@test1:/root #