ptrace + ioctl( LOOP_SET_FD ) brokeness.

[Erik A. Hendriks]

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
mlockall(MCL_CURRENT|MCL_FUTURE)        = 0
ioctl(4, 0x4c00


- Erik
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