Experiencing the problem with Feisty Fawn i386 as well.  Kernel package
version 2.6.20-16.31.

modprobe -v cloop file="/mnt/fakecd/KNOPPIX/KNOPPIX"
insmod /lib/modules/2.6.20-16-generic/kernel/ubuntu/misc/cloop.ko 
file=/mnt/fakecd/KNOPPIX/KNOPPIX
FATAL: Error inserting cloop 
(/lib/modules/2.6.20-16-generic/kernel/ubuntu/misc/cloop.ko): Cannot allocate 
memory

dmesg output:

[10699.992700] cloop: Initializing cloop v2.02
[10699.992820] kobject_add failed for cloop0 with -EEXIST, don't try to 
register things with the same name in the same directory.
[10699.992832]  [<c01eda99>] kobject_add+0x119/0x1a0
[10699.992872]  [<c01b1f14>] register_disk+0x44/0x1f0
[10699.992878]  [<c01e556f>] blk_register_region+0x2f/0x40
[10699.992901]  [<c01e55b6>] add_disk+0x36/0x50
[10699.992906]  [<c01e4d20>] exact_match+0x0/0x10
[10699.992910]  [<c01e53f0>] exact_lock+0x0/0x10
[10699.992922]  [<f8ebe180>] cloop_init+0x180/0x2d1 [cloop]
[10699.992964]  [<c014422d>] sys_init_module+0x15d/0x1ba0
[10699.993146]  [<c01031f0>] sysenter_past_esp+0x69/0xa9
[10699.993210]  =======================
[10699.993298] kobject_add failed for cloop1 with -EEXIST, don't try to 
register things with the same name in the same directory.
[10699.993307]  [<c01eda99>] kobject_add+0x119/0x1a0
[10699.993342]  [<c01b1f14>] register_disk+0x44/0x1f0
[10699.993347]  [<c01e556f>] blk_register_region+0x2f/0x40
[10699.993369]  [<c01e55b6>] add_disk+0x36/0x50
[10699.993373]  [<c01e4d20>] exact_match+0x0/0x10
[10699.993377]  [<c01e53f0>] exact_lock+0x0/0x10
[10699.993389]  [<f8ebe180>] cloop_init+0x180/0x2d1 [cloop]
[10699.993431]  [<c014422d>] sys_init_module+0x15d/0x1ba0
[10699.993612]  [<c01031f0>] sysenter_past_esp+0x69/0xa9
[10699.993675]  =======================
[10699.993720] kobject_add failed for cloop2 with -EEXIST, don't try to 
register things with the same name in the same directory.
[10699.993730]  [<c01eda99>] kobject_add+0x119/0x1a0
[10699.993764]  [<c01b1f14>] register_disk+0x44/0x1f0
[10699.993769]  [<c01e556f>] blk_register_region+0x2f/0x40
[10699.993791]  [<c01e55b6>] add_disk+0x36/0x50
[10699.993795]  [<c01e4d20>] exact_match+0x0/0x10
[10699.993799]  [<c01e53f0>] exact_lock+0x0/0x10
[10699.993811]  [<f8ebe180>] cloop_init+0x180/0x2d1 [cloop]
[10699.993853]  [<c014422d>] sys_init_module+0x15d/0x1ba0
[10699.994032]  [<c01031f0>] sysenter_past_esp+0x69/0xa9
[10699.994094]  =======================
[10699.994341] kobject_add failed for cloop3 with -EEXIST, don't try to 
register things with the same name in the same directory.
[10699.994351]  [<c01eda99>] kobject_add+0x119/0x1a0
[10699.994386]  [<c01b1f14>] register_disk+0x44/0x1f0
[10699.994390]  [<c01e556f>] blk_register_region+0x2f/0x40
[10699.994412]  [<c01e55b6>] add_disk+0x36/0x50
[10699.994416]  [<c01e4d20>] exact_match+0x0/0x10
[10699.994420]  [<c01e53f0>] exact_lock+0x0/0x10
[10699.994432]  [<f8ebe180>] cloop_init+0x180/0x2d1 [cloop]
[10699.994473]  [<c014422d>] sys_init_module+0x15d/0x1ba0
[10699.994651]  [<c01031f0>] sysenter_past_esp+0x69/0xa9
[10699.994713]  =======================
[10699.998419] kobject_add failed for cloop4 with -EEXIST, don't try to 
register things with the same name in the same directory.
[10699.998429]  [<c01eda99>] kobject_add+0x119/0x1a0
[10699.998464]  [<c01b1f14>] register_disk+0x44/0x1f0
[10699.998468]  [<c01e556f>] blk_register_region+0x2f/0x40
[10699.998490]  [<c01e55b6>] add_disk+0x36/0x50
[10699.998494]  [<c01e4d20>] exact_match+0x0/0x10
[10699.998498]  [<c01e53f0>] exact_lock+0x0/0x10
[10699.998510]  [<f8ebe180>] cloop_init+0x180/0x2d1 [cloop]
[10699.998550]  [<c014422d>] sys_init_module+0x15d/0x1ba0
[10699.998729]  [<c01031f0>] sysenter_past_esp+0x69/0xa9
[10699.998791]  =======================
[10699.999797] kobject_add failed for cloop5 with -EEXIST, don't try to 
register things with the same name in the same directory.
[10699.999807]  [<c01eda99>] kobject_add+0x119/0x1a0
[10699.999842]  [<c01b1f14>] register_disk+0x44/0x1f0
[10699.999846]  [<c01e556f>] blk_register_region+0x2f/0x40
[10699.999868]  [<c01e55b6>] add_disk+0x36/0x50
[10699.999872]  [<c01e4d20>] exact_match+0x0/0x10
[10699.999876]  [<c01e53f0>] exact_lock+0x0/0x10
[10699.999888]  [<f8ebe180>] cloop_init+0x180/0x2d1 [cloop]
[10699.999930]  [<c014422d>] sys_init_module+0x15d/0x1ba0
[10700.000110]  [<c01031f0>] sysenter_past_esp+0x69/0xa9
[10700.000172]  =======================
[10700.001170] kobject_add failed for cloop6 with -EEXIST, don't try to 
register things with the same name in the same directory.
[10700.001180]  [<c01eda99>] kobject_add+0x119/0x1a0
[10700.001215]  [<c01b1f14>] register_disk+0x44/0x1f0
[10700.001220]  [<c01e556f>] blk_register_region+0x2f/0x40
[10700.001241]  [<c01e55b6>] add_disk+0x36/0x50
[10700.001245]  [<c01e4d20>] exact_match+0x0/0x10
[10700.001249]  [<c01e53f0>] exact_lock+0x0/0x10
[10700.001261]  [<f8ebe180>] cloop_init+0x180/0x2d1 [cloop]
[10700.001302]  [<c014422d>] sys_init_module+0x15d/0x1ba0
[10700.001482]  [<c01031f0>] sysenter_past_esp+0x69/0xa9
[10700.001542]  =======================
[10700.002541] kobject_add failed for cloop7 with -EEXIST, don't try to 
register things with the same name in the same directory.
[10700.002551]  [<c01eda99>] kobject_add+0x119/0x1a0
[10700.002585]  [<c01b1f14>] register_disk+0x44/0x1f0
[10700.002590]  [<c01e556f>] blk_register_region+0x2f/0x40
[10700.002611]  [<c01e55b6>] add_disk+0x36/0x50
[10700.002615]  [<c01e4d20>] exact_match+0x0/0x10
[10700.002619]  [<c01e53f0>] exact_lock+0x0/0x10
[10700.002631]  [<f8ebe180>] cloop_init+0x180/0x2d1 [cloop]
[10700.002672]  [<c014422d>] sys_init_module+0x15d/0x1ba0
[10700.002852]  [<c01031f0>] sysenter_past_esp+0x69/0xa9
[10700.002914]  =======================
[10700.002916] cloop: loaded (max 8 devices)
[10700.003641] cloop: out of kernel mem for block buffer (0 bytes)

-- 
cloop don't work with 7.04 (amd64)
https://bugs.launchpad.net/bugs/120512
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