[dm-crypt] LUKS keyslot 4 is invalid

Arno Wagner arno at wagner.name
Thu Nov 20 20:04:40 CET 2014

Hi s4per,

this should be caused by something wrinign over the info for
Keyslot 4 (and possibly later) in the header. 

First, before you do anything, make that header backup, as described
in the FAQ, Itmm 6.2.  It will prevent things from getting worse. 

Usually, you key should be in keyslot 1 and that may still be 
intact. As you can see in FAQ Item 6.12, keyslot infor for 
keyslot 4 is stored at offset 0x190, so anything damaging it 
could also have damaged other fields in the LUKS header.
Still, give this a try:

   cryptsetup repair <device>

It may work, or it may give you another error. If so, please
post that here. (Do NOT do this wiothout header backup!)


On Wed, Nov 19, 2014 at 23:52:38 CET, Jarosław K wrote:
> Hi all,
> I have an encrypted RAID 1 volume for /home directory. I set it to mount
> automatically after login (based on
> http://nanonanonano.net/linux/debian/enchome). All of it works perfect
> during a few months. Until today ... After login I saw a "clean" user
> profile on my Debian. I know that, my encrypted drive didn't mount
> correctly. Unfortunately, manually mount failed too:
> root at s4per-debian:/home/s4per# cryptsetup luksOpen
> /dev/mapper/isw_echheajchc_Mirror crypt
> Numer klucza LUKS 4 jest nieprawidłowy.   ---> LUKS keyslot 4 is invalid (?)
> I have read something about this issue, and now i think it could be problem
> with LUKS headers. But unfortunatelly i have no any backup of it.
> In Poland we says "Polish wise after the event". Now I know, that I should
> make some backup of headers.
> I kindly request for some help.
> My OS: Debian Sid AMD64
> Regards,
> s4per

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Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
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