[Pkg-virtualbox-devel] Bug#799668: encountering umount.nfs: /mnt: is not an NFS filesystem for vboxsf

[Shaddy Baddah]

Hi,

On Mon, 21 Sep 2015 22:14:01 +1000 Shaddy Baddah 
<beryllium-bugs at shaddybaddah.name> wrote:
 >
 > As per the subject, since jessie, if I try to umount a vboxsf I
 > encounter an error:
 >
 > $ sudo mount -t vboxsf sw /mnt -o ro
 > $ sudo umount /mnt
 > umount.nfs: /mnt: is not an NFS filesystem for vboxsf

I should add that using umount -i (don't call the umount.<type> helpers)
will successfully workaround the problem, and umount the fs.

Also, with the open-vm-tools-dkms example, the magic def looks like:

/usr/src/open-vm-tools-9.4.6/vmblock/linux/filesystem.h:58:#define 
VMBLOCK_SUPER_MAGIC 0xabababab

Which is obviously contrived (they all are I guess), but outside the
kernel provided defines.

Given enough time, I can produce a simple patch, then we would have the
option of raising with upstream, and adding to packages patch list.

-- 
Regards,
Shaddy