i am beginning to think there really is a problem. i have a luks encrypted partition that i automatically mount at boot via /etc/crypttab with a *keyfile* so this has never failed and it can't fail except if the keyfile is damaged. and today the luks partition failed to be opened for the *first* time *ever* by cryptsetup because of a password problem. once i rebooted it worked. so the keyfile is not wrong. and i double check it with my backup keyfile this looks like your problem Hussam. it sometimes fails sometimes works.
