Most interestingly, using mkfs.ext4dev does work. I have to mount the device as -t ext4, since ext4dev is not recognized, but besides, it's fine. This doesn't solve the problem, though. It only shows it's not a hardware or direct cryptsetup problem, although it doesn't happen with a nonencrypted device.
Most interestingly, using mkfs.ext4dev does work. I have to mount the device as -t ext4, since ext4dev is not recognized, but besides, it's fine. This doesn't solve the problem, though. It only shows it's not a hardware or direct cryptsetup problem, although it doesn't happen with a nonencrypted device.