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SubjectRe: serpent loopback crypto "EXT2-fs: group descriptors corrupted"
spam goes to /dev/null wrote:
> i created a 10mb file called .enc2 with random data and ran "# losetup -e
> serpent -k 128 /dev/loop0 /mnt/hda7/.enc2"
> then i ran "# mke2fs /dev/loop0" and tried to "# mount /dev/loop0 /enc". but
> i get the following error messages when trying to mount:
> May 19 21:32:10 HOST2 kernel: EXT2-fs error (device loop(7,0)):
> ext2_check_descriptors: Block bitmap for group 16 not in group (block 0)!
> May 19 21:32:10 HOST2 kernel: EXT2-fs: group descriptors corrupted !
> im using kernel 2.4.4 patched with crypto patch [and util linux
> 2.11a patched with the patch from that crypto patch]
> i also got the same errors with a 2gb file and by creating the loop device
> directly on my 19.5gb /dev/hda7
> i tried a few times again and sometimes the encrypted loopback fs works
> perfectly, sometimes the error occurs!?
> anyone got an idea what this is!? i will supply more information on request

International crypto patch is misdesigned and broken, period. If you don't
want to play russian roulette with your data, you should consider using
loop-AES package. loop-AES announcement is here:

Jari Ruusu <>
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