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Subjectptrace + ioctl( LOOP_SET_FD ) brokeness.
The following hangs reliably on 2.4.22 (test on x86 and x86_64):

strace mount -o loop somefile /mnt

the mount program ends up wedged in the D state. The last file lines
of the strace look like this:

open("/dev/loop0", O_RDONLY|O_LARGEFILE) = 3
ioctl(3, 0x4c03, 0xbfffded0) = -1 ENXIO (No such device or address)
close(3) = 0
open("xxx", O_RDWR|O_LARGEFILE) = 3
open("/dev/loop0", O_RDWR|O_LARGEFILE) = 4
ioctl(4, 0x4c00

- Erik
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