I have an encrypted root partition (LUKS). Recently when it tries to boot up, right at the start screen when the master key is unlocking, I get these messages:

Error: Invalid sector size 65535 65531
Error: Invalid sector size 65535 65531
Error: Invalid sector size 65535 65531

The messages are not identical and not an exact match. The numbers look like some limit of an integer, I don't remember exactly.

Nothing bad happens from this as far as I can tell, everything boots as expected anyway.