Blkid" sees a LUKS UUID and an ext2/swap UUID on the same device. What is wrong?

Some old versions of cryptsetup have a bug where the header does not get completely wiped during LUKS format and an older ext2/swap signature remains on the device. This confuses blkid. Fix: Wipe the unused header areas by doing a backup and restore of the header with cryptsetup 1.1.x: cryptsetup luksHeaderBackup --header-backup-file cryptsetup luksHeaderRestore --header-backup-file • cryptsetup segfaults on Gentoo amd64 hardened ... There seems to be some inteference between the hardening and and the way cryptsetup benchmarks PBKDF2.

The solution to this is currently not quite clear for an encrypted root filesystem. More.

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