systemd stuck on mounting an encrypted volume

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http://unix.stackexchange.com – systemd seems to stuck on mounting an encrypted volume, when I set the init to /usr/sbin/systemd in grub.cfg, I have one line in /etc/crypttab secure /dev/sda8 /etc/cb.key That works with original init program, but when I switched to systemd, it stuck at [ OK ] Reached target Encrypted Volume And it got the right device name, right mapper name, but just won't go on. Wait for like 60s, I got a timeout message. How should I debug it? (HowTos)