[Grml] Loop mount not automatically cleaned

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Hi, 

I noticed that loop mounts are not automatically cleaned in my system. 
Is there any way that I can fix it?

Each time after I loop mount, the loop device number increased. When I do
ps, I found that there are many loop process in execution:

 $ ps -eaf | grep loop
 root      5566     1  0 Jan05 ?        00:01:44 [loop0]
 root      5597     1  0 Jan05 ?        00:00:00 [loop1]
 root      5603     1  0 Jan05 ?        00:00:00 [loop2]
 root     10995     1  0 00:28 ?        00:01:41 [loop3]
 root     26656     1  0 11:42 ?        00:01:40 [loop4]
 root      6234     1  0 17:45 ?        00:00:00 [loop5]

Previously, the loop process will be gone after I umount the loop mount.

As the result, my disk space did not re-gain after deleting loop mounted iso
files:

  sudo mount -o loop my-big.iso /mnt/tmp1

 $ df
 /dev/sda14            79631676  52241640  27390036  66% /lfs/cache12
 /dev/loop3             4571190   4571190         0 100% /mnt/tmp1

 sudo umount /mnt/tmp1

 $ lsof | grep my-big

 rm my-big.iso 

 $ df
 /dev/sda14            79631676  52241640  27390036  66% /lfs/cache12

The my-big.iso is over 4G in size, but there is no space increase after
it being deleted. I've checked with lsof that no one is using it.

please help. thanks

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