Description of problem:

I use an external USB hard disk for backups. It has two volume groups
called BigBackupVg and BigbackupVg2

After unmounting the filesysystems on the external disk it is not possible
to deactivate the volume groups. This used to work under F14 and earlier

Version-Release number of selected component (if applicable):

F16. Installed latest updates today

uname -a 
Linux  3.3.1-5.fc16.x86_64 #1 SMP Tue Apr 10 19:56:52 UTC 2012 x86_64 x86_64 x86_64 GNU/Linu

How reproducible:
Always

Steps to Reproduce:
1. activate the volume group and mount the device

sudo vgscan && sudo vgchange -a y BigBackupVg &&
sudo mount /dev/mapper/BigBackupVg-lvol0 /mnt/backup/

2. unmount the device 

sudo umount /mnt/backup/ 


mount |grep backup

shows nothing. The unmount has worked.


3. sudo vgchange -a n BigBackupVg 

  
Actual results:

 Can't deactivate volume group "BigBackupVg" with 1 open logical volume(s)

Expected results:

Volume group should be deactivated.

Additional info:



If I don't moutn a filesystem, the volume CAN be deactivated.

ls -al /dev/BigBackupVg/lvol0 
lrwxrwxrwx. 1 root root 7 Apr 14 19:30 /dev/BigBackupVg/lvol0 -> ../dm-7

ps auxwwww|grep 'dm-7'
root      2362  0.0  0.0      0     0 ?        S    19:30   0:00 [jbd2/dm-7-8]


This thread should no longer exist after unmounting, should it?


When mounted:

/dev/mapper/BigBackupVg-lvol0 on /mnt/backup type ext3 (rw,relatime,seclabel,user_xattr,acl,barrier=1,nodelalloc,data=ordered)