Boots up string "Password for filesystem"

Hi.

I've looked in the cryptsetup source and I can't figure out where the string "Password for filesystem" is. I don't think any other program would be making this request, so I am thinking that my system has been cracked. I hope someone has a more logical thought they would be willing to share.

cryptsetup status /dev/mapper/luks-444...337
/dev/mapper//dev/mapper/luks-444..337 is active:
cipher: aes-xts-plain64
keysize: 512 bits

  device:  /dev/mapper/master-myroot
  offset:  4040 sectors
  size:    4517944 sectors
  mode:    read/write

Of course that other programs ask for password during boot.. (later piping passphrase to cryptsetup)

You did not mention your distro, but exactly this query was performed by some older dracut (or plymouth) during boot.
Search Google for prompt="Password for filesystem" ;-)

Milan