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SubjectLoopback, unable to release
Using 2.4.4-ac3 (as well as in 2.4.3*) I have found it impossible to 
unmap a loopback

strace losetup -d /dev/loop0 (relevant portion)

open("/dev/loop0", O_RDONLY) = 3
ioctl(3, LOOP_CLR_FD, 0) = -1 EBUSY (Device or resource busy)
open("/usr/share/locale/en_US/LC_MESSAGES/", O_RDONLY) = -1
ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/", O_RDONLY) = -1 ENOENT
(No such file or directory)
write(2, "ioctl: LOOP_CLR_FD: Device or re"..., 44ioctl: LOOP_CLR_FD:
Device or resource busy) = 44
_exit(1) = ?

also I have loop.o as module, and use count never decreases, in fact
right now it is at 294.

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