Comment 31 for bug 532898

I found that cryptsetup still needs the custom keyscript to access the key-file on the external USB device for the encrypted root.

Without the keyscript specified in "/etc/crypttab" cryptsetup doesn't create an initrd /conf/conf.d/cryptroot file - which maybe should be the subject of another bug.

For the /var and /home encrypted volumes I also found that this bug will strike if the USB device isn't inserted very early and given chance to settle - I find inserting it immediately after GRUB menu, which I have displayed for up to 10 seconds. If it is inserted only when the kernel begins running the device isn't ready in time to be mounted according to the "/etc/fstab" entry and this bug will strike.