I have the same problem:
on
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 10.04.3 LTS
Release:        10.04
Codename:       lucid

none of the these options worked for me, short:
- dbus.conf
- K14 links
- S31 earlier
- a modprobe option 
http://blog.dhampir.no/content/cifs-vfs-no-response-for-cmd-n-mid

the only option that seemed to work i found on
http://hardc0l2e.wordpress.com/2011/06/30/ubuntu-11-04-shutdown-and-restart-problem-with-cifs/

in short:
"
Rename the current shutdown, reboot and restart commands in /sbin.

#> mv /sbin/shutdown /sbin/shutdown2
#> mv /sbin/reboot /sbin/reboot2
#> mv /sbin/restart /sbin/restart2 

2. Then create scripts with names of the previous commands in /sbin,
which contains the following:

#!/bin/sh
umount -t cifs -a -f -l
/sbin/shutdown2 $@
exit 0 

3. Make similar script for reboot and restart command which also points to 
/sbin/reboot2 and /sbin/restart2.
"
but i also had to change the two links under /sbin,  halt and poweroff to point 
to reboot2 instead of reboot,
otherwise my machine would shutdown when isuing a shutdown -h now,
but just rebooted instead.

Could this be related to cifs getting mounted twice (when present in
fstab)?

It took me quiet some time, to test, and find a solution.

more output:
i use cifs mount with a vpn connection (cisco),
after mount -a i then get
$mount
..
/dev/sdb1 on /media/terra type ext4 (rw,nosuid,nodev,uhelper=udisks)
//fas-gt-01/rt on /mnt/rt type cifs (rw,mand)
//fas-gt-02/brt on /mnt/brt_gt type cifs (rw,mand)
//fas-gt-02/EX on /mnt/Ex type cifs (ro,mand)
//fas-gt-02/EX on /mnt/Ex type cifs (ro,mand)
//fas-gt-02/GR on /mnt/gr type cifs (ro,mand)
//fas-gt-02/GR on /mnt/gr type cifs (ro,mand)

So the ro mount are mounted twide..? While the rw get mounted once..
fstab options rw mount:
cifs 
rw,noserverinfo,uid=1000,gid=1000,file_mode=0750,dir_mode=0750,credentials=/home/user/config/scripts/.cifs.credentials
fstab options rw mount:
cifs 
ro,noserverinfo,uid=1000,gid=1000,file_mode=0440,dir_mode=0440,credentials=/home/user/config/scripts/.cifs.credentials

i have attached cifs entries in syslog

hth,
G


** Attachment added: "cifs.syslog.grep"
   
https://bugs.launchpad.net/network-manager/+bug/211631/+attachment/2569695/+files/cifs.syslog.grep

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https://bugs.launchpad.net/bugs/211631

Title:
  Network is brought down before network filesystems are unmounted (CIFS
  timeout at shutdown)

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