Most recent kernel where this bug did not occur:

Distribution:
debian unstable

Hardware Environment:
x86 pM

Software Environment:
gnu

Problem Description and Steps to reproduce:
let's say that I made image of HDD for backup:
dd if=/dev/sdd of=/spool/sdd-backup
losetup /dev/loop0 /spool/sdd-backup
fdisk -l /dev/loop0
Disk /dev/loop0: 536 MB, 536870912 bytes
32 heads, 63 sectors/track, 520 cylinders
Units = cylinders of 2016 * 512 = 1032192 bytes

      Device Boot      Start         End      Blocks   Id  System
/dev/loop0p1   *           1         520      524128+   6  FAT16

now, all nice - but there's no device called /dev/loop0p1 so I can't mount it!

I wish kernel somehow scan that loop device, just like it does when I insert 
any sort of device, whether that's usb stick or removable drive.
thank you!