systemd-tty-ask hangs

It is rather annoying when systemd-tty-ask or /bin/systemd-tty-ask-password-agent –watch hangs during a package installation, service start or stop operation.

Although rebooting system solves the problem, fortunately it is enough to restart the systemd manager only:

sudo systemctl daemon-reexec

I suspect this is a systemd bug as daemon-reexec said to be doing nothing special apart from restarting the daemon with the config reread.