(In reply to comment #9)
> original fix results to: Unmounting file systems: Cannot umount "" [FAILED]
> see https://bugzilla.redhat.com/show_bug.cgi?id=685137#c1
Ahh yeah, duh...
We should probably get rid of the empty argument there as it may be confusing /bin/umount. IOW, change:
action "$3" fstab-decode umount '' $remaining
...to:
action "$3" fstab-decode umount $remaining
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.
http://rhn.redhat.com/errata/RHBA-2011-0647.html