ext4: invalid extent block on imx7

Hi all,

=> ls mmc 0:1 /usr/lib/linux-image-4.9.11-1.3.0-dirty CACHE: Misaligned operation at range [bdfff998, bdfffd98] CACHE: Misaligned operation at range [bdfff998, bdfffd98] CACHE: Misaligned operation at range [bdfff998, bdfffd98] CACHE: Misaligned operation at range [bdfff998, bdfffd98] invalid extent block

I'm using master (50be9f0e1ccc) on the MCIMX7SABRE, defconfig.

What could this be? The filesystem is fine from Linux POV.

Thanks Jan