Comment # 3 on bug 1149066 from Franck Bui

(In reply to Michal Suchanek from comment #0)
> # systemctl daemon-reload
> # systemctl start systemd-cryptsetup@cr_usb.service 
> Please enter passphrase for disk Cruzer_Fit (cr_usb): ^C

My guess is that you just interrupted systemctl here but PID1 is still trying
to activate the job you queued with systemctl.

systemctl was simply waiting for systemd-cryptsetup@cr_usb.service to be
running. You killed it but this had no effects the queued job itself.

After pressing ^C, what does "systemctl status
systemd-cryptsetup@cr_usb.service" show ?