Truecrypt with ext3 on Linux

Yes, first i thougth this would be easy, too.
But after launching the truecrypt application

i got quickly to this page:

This pull-down menu has only the choices for FAT or NONE filesystem... So let's move to the command line:

hades:/home/schroff/packages# truecrypt -t --create
Volume type:
1) Normal
2) Hidden
Select [1]:

Enter volume path: /dev/sda3

Encryption algorithm:
1) AES
2) Serpent
3) Twofish
4) AES-Twofish
5) AES-Twofish-Serpent
6) Serpent-AES
7) Serpent-Twofish-AES
8) Twofish-Serpent
Select [1]:

Hash algorithm:
1) RIPEMD-160
2) SHA-512
3) Whirlpool
Select [1]:

Filesystem:
1) FAT
2) None
Select [1]: 2

Enter password:
Re-enter password:

Enter keyfile path [none]:

Please type at least 320 randomly chosen characters and then press Enter:

Done: 0.370% Speed: 10.7 MB/s Left: 15 minutes

Done: 100.000% Speed: 4.1 MB/s Left: 0 s
The TrueCrypt volume has been successfully created.

hades:/home/schroff/packages# truecrypt -t /dev/sda3

But then i got this kernel error:

Oct 28 22:02:26 hades kernel: Modules linked in: loop af_packet fglrx(PF) iphone(F) binfmt_misc ipw2200 tun vboxdrv ppdev parport_pc lp parport ipv6 button
ac battery vfat fat dm_snapshot dm_mirror dm_mod sr_mod sd_mod snd_intel8x0m sbp2 scsi_mod eth1394 joydev mousedev tsdev snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_intel8x0 snd_ac97_codec rtc ac97_bus snd_pcm_oss snd_mixer_oss ohci1394 snd_seq_device snd_pcm snd_timer i2c_i801 psmouse snd soundcore snd_page_alloc firmware_class pcspkr ieee1394 ehci_hcd uhci_hcd usbcore intel_agp shpchp pci_hotplug agpgart evdev unix lzf
Oct 28 22:02:26 hades kernel: CPU: 0
Oct 28 22:02:26 hades kernel: EIP: 0060:[<f8fff99c>] Tainted: PF VLI
Oct 28 22:02:26 hades kernel: EFLAGS: 00010202 (2.6.21 #3)
Oct 28 22:02:26 hades kernel: EIP is at transfer_none+0x70/0xc4 [loop]
Oct 28 22:02:26 hades kernel: eax: d0fd9000 ebx: 3a748000 ecx: 00000080 edx: cc210000
Oct 28 22:02:26 hades kernel: esi: 3a748000 edi: d0fd9000 ebp: 00000200 esp: cc211e5c
Oct 28 22:02:26 hades kernel: ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068
Oct 28 22:02:26 hades kernel: Process loop0 (pid: 11324, ti=cc210000 task=e5e3b030 task.ti=cc210000)
Oct 28 22:02:26 hades kernel: Stack: 00000000 1ee4eecd c7569c05 00000000 00000200 cc211f50 cc211fa0 f8ffe2e6
Oct 28 22:02:26 hades kernel: 00000000 c121fb20 00000000 00000200 01411f00 00000000 00000000 c1f4e900
Oct 28 22:02:26 hades kernel: 00000200 c0fa9000 f8fff92c 00000000 c121fb20 00000002 c1f4e900 823e0000
Oct 28 22:02:26 hades kernel: Call Trace:
Oct 28 22:02:26 hades kernel: [<f8ffe2e6>] lo_read_actor+0x9e/0xdc [loop]
Oct 28 22:02:26 hades kernel: [<f8fff92c>] transfer_none+0x0/0xc4 [loop]
Oct 28 22:02:26 hades kernel: [<c0146131>] do_generic_mapping_read+0x19f/0x46b
Oct 28 22:02:26 hades kernel: [<c014644b>] generic_file_sendfile+0x4e/0x60
Oct 28 22:02:26 hades kernel: [<f8ffe248>] lo_read_actor+0x0/0xdc [loop]
Oct 28 22:02:26 hades kernel: [<f8fff583>] loop_thread+0x38b/0x404 [loop]
Oct 28 22:02:26 hades kernel: [<f8ffe248>] lo_read_actor+0x0/0xdc [loop]
Oct 28 22:02:26 hades kernel: [<c0323712>] __sched_text_start+0x52a/0x5e2
Oct 28 22:02:26 hades kernel: [<c01463fd>] generic_file_sendfile+0x0/0x60
Oct 28 22:02:26 hades kernel: [<f8fff1f8>] loop_thread+0x0/0x404 [loop]
Oct 28 22:02:26 hades kernel: [<c0128c8b>] kthread+0xa0/0xc9
Oct 28 22:02:26 hades kernel: [<c0128beb>] kthread+0x0/0xc9
Oct 28 22:02:26 hades kernel: [<c010486f>] kernel_thread_helper+0x7/0x10
Oct 28 22:02:26 hades kernel: =======================

After some reading i found, that this i due to a bug in 2.6.21... So i had to download a new kernel, do my patches (like tuxonice), compile and get my fglrx driver for my ATI X600...
But after one evening, the next attempt:

hades:/home/schroff/packages# truecrypt -t /dev/sda3 --filesystem=none

hades:/home/schroff/packages# truecrypt -t --volume-properties
Slot: 1
Volume: /dev/sda3
Virtual Device: /dev/loop0
Mount Directory:
Size: 10.0 GB
Type: Normal
Read-Only: No
Hidden Volume Protected: No
Encryption Algorithm: AES
Key Size: 256 bits
Block Size: 128 bits
Mode of Operation: XTS
PKCS-5 PRF: HMAC-RIPEMD-160
PKCS-5 Iteration Count: 2000
Volume Created: Tue Oct 28 20:11:48 2008
Header Last Modified: Tue Oct 28 20:11:48 2008
Data Read since Mount: 4 KB
Data Written since Mount: 0 B


hades:/home/schroff/packages# mkfs.ext3 /dev/loop0

and after that i was able to mount the volume with

hades:/home/schroff/packages# truecrypt -t /dev/sda3