umount.cifs(8)
...
BUGS
At this time umount.cifs does not lock the mount table using the same
lock as the umount utility does, so do not attempt to do multiple
unmounts from different processes (and in particular unmounts of a cifs
mount and another type of filesystem mount at the same time).
If the same mount point is mounted multiple times by cifs, umount.cifs
will remove all of the matching entries from the mount table (although
umount.cifs will actually only unmount the last one), rather than only
removing the last matching entry in /etc/mtab. The pseudofile
/proc/mounts will display correct information though, and the lack of
an entry in /etc/mtab does not prevent subsequent unmounts.
Note that the typical response to a bug report is a suggestion to try
the latest version first. So please try doing that first, and always
include which versions you use of relevant software when reporting bugs
(minimum: umount.cifs (try umount.cifs -V), kernel (see /proc/version)
and server type you are trying to contact.
...
--
Noèl Köthe <noel debian.org>
Debian GNU/Linux, www.debian.org
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