[SOLVED] Truecrypt - failed to set up a loop device

Roken · 2012-03-02 14:21:55

Since yesterday's kernel upgrades I've hit a problem with Truecrypt. I have two truecrypt volumes, one being a full partition and the other being a file mounted as a truecrypt volume. The full partition mounts just fine, but the file fails with "Faile to set up a loop device". The wiki only suggests rebooting (which doesn't help). I've reinstalled each of TC and the kernel 'just in case' but again, no difference.

The same error is given with both the stock kernel and the ck kernel (3.2.9.1).

I'm at a bit of a dead end now. Any ideas?

Last edited by Roken (2012-03-04 00:28:13)

misc · 2012-03-02 19:30:02

Same for me. With no the real changes to the kernel pkgbuild I suspect we'll have to wait for truecrypt 7.1b or a patch by some kind wizard, unfortunately.

Roken · 2012-03-03 00:44:58

Ahh. thanks for replying. I could just boot Windows and recover the encrypted stuff there. The more important drive will mount, so not a huge problem right now. I guess I could also downgrade the kernel. Hmmm - downgrade the kernel or boot windows? Dunno which is worst

qnd · 2012-03-03 04:46:11

I'm running a fully updated system and no errors with TrueCrypt here.

Do you have ntfsprogs installed? I remember when I had that package installed I would get the same error when trying to unmount a TrueCrypt container (though this was a while ago), which could be worked around with a forced unmount or by installing ntfs-3g_ntfsprogs-git (unstable) from the AUR, neither being an optimal solution.

Turns out uninstalling ntfsprogs and replacing it with ntfs-3g fixed the problem. Don't really remember why I had installed ntfsprogs in the first place instead of ntfs-3g.

Last edited by qnd (2012-03-03 04:51:38)

misc · 2012-03-03 08:45:51

ntfs-3g_ntfsprogs-git has been installed (regularly updated) for a long time now, but I doubt that it's the cause of this — no problems before and neither the encrypted image nor its storage location use ntfs.

misc · 2012-03-03 23:57:53

Found the cause: loop isn't automatically modprobe'd anymore.

Roken · 2012-03-04 00:26:53

Holy cow - good find. one quick modprobe later and there it is nicely mounted .

TY

beachcoder · 2012-03-18 22:43:28

What do I have to do to add it permanently?
Or is one call of "modprobe loop" enough?

Awebb · 2012-03-18 22:58:53

Wise men say: He, who edits the rc.conf, can obtain everything.

Roken · 2012-03-19 00:13:08

or, as has been hinted at, add "loop" to the modules section of rc.conf

beachcoder · 2012-03-19 08:16:16

Roken wrote:

or, as has been hinted at, add "loop" to the modules section of rc.conf

Thanks, I've got it

tomaqa · 2012-09-28 11:57:19

Roken wrote:

or, as has been hinted at, add "loop" to the modules section of rc.conf

Thanks too!

2ManyDogs · 2012-09-28 12:57:57

Modules to be loaded should no longer be listed in rc.conf. They go in modules-load.d now. This procedure (described in the wiki truecrypt topic) worked for me:

If not listed, retry the TrueCrypt command after modprobe loop. Should it work, consider to add loop to the MODULES array in /etc/modules-load.d:
# tee /etc/modules-load.d/truecrypt.conf <<< "loop"

See the rc.conf and systemd topics in the wiki for more information.

Last edited by 2ManyDogs (2012-09-28 13:09:15)

errorval · 2014-03-24 11:08:35

After you reboot then you're back to square one. If you want to make this solution permanent you will have to rebuild 'initrd' with the new module options that include loop devices:

tee /etc/modules-load.d/truecrypt.conf <<< "loop"
tee /etc/modprobe.d/eightloop.conf << "options loop max_loop=8"
dracut --force
reboot

fsckd · 2014-03-24 14:25:06

Thank you errorval. As this is an old thread, I will close it now, as per our policy: Forum Etiquette: Old Threads / Necro-Bumping.

Arch Linux

#1 2012-03-02 14:21:55

[SOLVED] Truecrypt - failed to set up a loop device

#2 2012-03-02 19:30:02

Re: [SOLVED] Truecrypt - failed to set up a loop device

#3 2012-03-03 00:44:58

Re: [SOLVED] Truecrypt - failed to set up a loop device

#4 2012-03-03 04:46:11

Re: [SOLVED] Truecrypt - failed to set up a loop device

#5 2012-03-03 08:45:51

Re: [SOLVED] Truecrypt - failed to set up a loop device

#6 2012-03-03 23:57:53

Re: [SOLVED] Truecrypt - failed to set up a loop device

#7 2012-03-04 00:26:53

Re: [SOLVED] Truecrypt - failed to set up a loop device

#8 2012-03-18 22:43:28

Re: [SOLVED] Truecrypt - failed to set up a loop device

#9 2012-03-18 22:58:53

Re: [SOLVED] Truecrypt - failed to set up a loop device

#10 2012-03-19 00:13:08

Re: [SOLVED] Truecrypt - failed to set up a loop device

#11 2012-03-19 08:16:16

Re: [SOLVED] Truecrypt - failed to set up a loop device

#12 2012-09-28 11:57:19

Re: [SOLVED] Truecrypt - failed to set up a loop device

#13 2012-09-28 12:57:57

Re: [SOLVED] Truecrypt - failed to set up a loop device

#14 2014-03-24 11:08:35

Re: [SOLVED] Truecrypt - failed to set up a loop device

#15 2014-03-24 14:25:06

Re: [SOLVED] Truecrypt - failed to set up a loop device

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