Attempting to mount an apfs disk iso from an NTFS filesystem corrupts the NTFS superblock

[EthanZeigler]

When attempting to mount an APFS disk image (iso) that's living on an NTFS filesystem, the NTFS filesystem superblock corrupts itself in a way that mounting the drive in fstab causes the kernel to go into emergency mode.

steps to reproduce

• create a disk image (iso) of an AFPS formatted drive
• mount the disk image sudo apfs-fuse /NFTS_MOUNT/path/to/iso /mnt/apfs

Expected

Drive mounts to the apfs directory

Actual

Invalid superblock error occurs no matter if the drive is correctly formatted or not. I've verified on a Mac device the iso is valid.

On the next reboot, Linux will (correctly) state that the NTFS superblock on the drive that held the iso is corrupt. Thankfully it's recoverable via ntfsfix but that absolutely shouldn't be necessary.