grub failure after fresh system installation with lvm on luks: disk lvmid/.. not found

[Martin Castillo]

Hi,

I'm trying to install guix (inside qemu) with "/" on lvm on luks on 
sda2. sda1 contains the efi partition:

NAME                    MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINTS
fd0                       2:0    1     4K  0 disk
sda                       8:0    0    30G  0 disk
├─sda1                    8:1    0   600M  0 part  /mnt/efi
└─sda2                    8:2    0  29.4G  0 part
  └─lukspart            253:0    0  29.4G  0 crypt
    └─lvmSystem-volRoot 253:1    0  29.4G  0 lvm   /tmp
                                                   /mnt
sr0                      11:0    1 813.9M  0 rom
sr1                      11:1    1  1024M  0 rom

The installation finishes with no problem. However on reboot grub errors 
out:
error: disk 
`lvmid/VyWL64-HaH6-Wnec-fiND-VZye-90JJ-LxWLuj/NvcAEV-u4y7-PAyi-6ctt-
   xlrL-Wbzt-eTfVq3' not found.
   Entering rescue mode...
   grub rescue> insmod lvmi
   error: disk 
`lvmid/VyWL64-HaH6-Wnec-fiND-VZye-90JJ-LxWLuj/NvcAEV-u4y7-PAyi-6ctt-
   xlrL-Wbzt-eTfVq3' not found.
   grub rescue> insmod lvm
   grub rescue> ls
   (hd0) (cd0) (cd1)
   grub rescue> insmod lvm
   grub rescue> cryptomount (hd0)
   Unknown command `cryptomount'.
   grub rescue> cryptomount
   Unknown command `cryptomount'.
   grub rescue> insmod luks2
   error: disk 
`lvmid/VyWL64-HaH6-Wnec-fiND-VZye-90JJ-LxWLuj/NvcAEV-u4y7-PAyi-6ctt-
   xlrL-Wbzt-eTfVq3' not found.
   grub rescue> lin
   Unknown command `lin'.
   grub rescue> insmod luks
   error: disk 
`lvmid/VyWL64-HaH6-Wnec-fiND-VZye-90JJ-LxWLuj/NvcAEV-u4y7-PAyi-6ctt-
   xlrL-Wbzt-eTfVq3' not found.
   grub rescue> insmod lvm
   grub rescue>

Looks like it cannot load the modules luks / luks2. Is it looking for 
those on the root partition?  That lvmid belongs to my root partition. 
Well, that's still encrypted. I attached the grub.cfg created by guix 
system init.

I don't know how this chicken-egg problem is generally solved by grub.
On my day-to-day system I have a similar setup (root on lvm on luks), 
but I don't know, why/how this works. I do have a 1M grub partition, 
though I believe I just followed a bad guide and it is only used on 
bios+gpt systems.

Is there something wrong with my config.scm, or is this a guix bug?

Martin Castillo

config.scm
Description: Text Data

grub lvm not found.png
Description: PNG image

bad.grub.cfg
Description: Text document