Please stop apps going into state D uninterrupted sleep !!

[Alan Cox]

> That'd prevent the infinite waits for a non-available file system, and
> deal with programs thinking they're writing files when they're really
> dumping data nowhere.

Already supported and has been for years via the soft option to NFS
mounts. The designers of NFS figured that before Linux even existed.

We also have umount -f.

killall -9 problem process
umount -f the NFS partition

may need repeating a few times but will do the job.