$ veritysetup open /dev/sda1 verity-test /dev/sda2 ac74719989759849a4a87c281890f1b33532c26fa5580f1f5deaeef6d39351fe
[ 5511.541284] device-mapper: verity: sha256 using implementation "sha256-generic"
[ 5511.617524] verity_handle_err: 90 callbacks suppressed
[ 5511.617548] device-mapper: verity: 8:1: data block 0 is corrupted
[ 5511.631450] device-mapper: verity: 8:1: data block 0 is corrupted
[ 5511.637823] buffer_io_error: 91 callbacks suppressed
[ 5511.637835] Buffer I/O error on dev dm-0, logical block 0, async page read
Verity device detected corruption after activation.
(省略)