$ mount /dev/mapper/verity-test ~/mnt/
[ 5589.955679] buffer_io_error: 91 callbacks suppressed
[ 5589.955702] Buffer I/O error on dev dm-0, logical block 0, async page read
[ 5589.968630] /dev/mapper/verity-test: Can't open blockdev
[ 5589.975371] EXT4-fs (dm-0): unable to read superblock
mount: /home/root/mnt: can't read superblock on /dev/mapper/verity-test.
       dmesg(1) may have more information after failed mount system call.
