I remember loopback mounting always gave errors on shutdown when the file system was being unmounted. It seemed to me that it would unmount before caches were f

I remember loopback mounting always gave errors on shutdown when the file system was being unmounted. It seemed to me that it would unmount before caches were flushed, resulting in a need for fsck later (and possibly resulting in corruption or data loss). Do you know if there's been any attempt to address issues like these?