For full-size partitions that are going to reside in loop devices,
specify --sizelimit explicitly.

This avoids the problem when mounting the ext4 partition:
  EXT4-fs : bad geometry: block count <n> exceeds size of device (<m> blocks)

Also an attempt to fix:
  attempt to access beyond end of device
  mmcblk0p2: rw=0, want=424110, limit=417690