LVM on LUKS not working

[elendi1]

Which ISO version are you using?

2025-05-01

The installation log

[2025-05-23 16:45:44] - DEBUG - Unmounting all existing partitions: /dev/nvme0n1
[2025-05-23 16:45:44] - DEBUG - Unmounting: /dev/nvme0n1p1
[2025-05-23 16:45:44] - DEBUG - Unmounting: /dev/nvme0n1p2
[2025-05-23 16:45:44] - INFO - Wiping partitions and metadata: /dev/nvme0n1
[2025-05-23 16:45:44] - INFO - Creating partitions: /dev/nvme0n1
[2025-05-23 16:45:44] - DEBUG - 	Type: primary
[2025-05-23 16:45:44] - DEBUG - 	Filesystem: fat32
[2025-05-23 16:45:44] - DEBUG - 	Geometry: 2048 start sector, 2097152 length
[2025-05-23 16:45:44] - DEBUG - 	Type: primary
[2025-05-23 16:45:44] - DEBUG - 	Filesystem: ext4
[2025-05-23 16:45:44] - DEBUG - 	Geometry: 2099200 start sector, 998113280 length
[2025-05-23 16:45:44] - DEBUG - Formatting boot partition: /dev/nvme0n1p1
[2025-05-23 16:45:44] - DEBUG - Formatting filesystem: mkfs.fat -F 32 /dev/nvme0n1p1
[2025-05-23 16:45:45] - DEBUG - partition information found: {"name":"nvme0n1p1","path":"/dev/nvme0n1p1","pkname":"nvme0n1","log_sec":512,"size":"1024 MiB","pttype":"gpt","ptuuid":"9e8d7140-196b-4e9f-ba46-be8634e3a883","rota":false,"tran":"nvme","partn":1,"partuuid":"14c6bbac-5dd9-496a-b59b-94bbb935d1bb","parttype":"c12a7328-f81f-11d2-ba4b-00a0c93ec93b","uuid":"6390-4590","fstype":"vfat","fsver":"FAT32","fsavail":null,"fsuse_percentage":null,"type":"part","mountpoint":null,"mountpoints":[],"fsroots":[],"children":[]}
[2025-05-23 16:45:45] - INFO - Setting up LVM config...
[2025-05-23 16:45:45] - DEBUG - Luks2 encrypting: /dev/nvme0n1p2
[2025-05-23 16:45:45] - DEBUG - cryptsetup format: cryptsetup --batch-mode --verbose --type luks2 --pbkdf argon2id --hash sha512 --key-size 512 --iter-time 10000 --use-urandom luksFormat /dev/nvme0n1p2
[2025-05-23 16:46:15] - DEBUG - cryptsetup luksFormat output: Key slot 0 created.
Command successful.
[2025-05-23 16:46:15] - DEBUG - Unlocking luks2 device: /dev/nvme0n1p2
[2025-05-23 16:46:25] - DEBUG - cryptsetup open output: 
[2025-05-23 16:46:25] - ERROR - Traceback (most recent call last):
  File "/usr/lib/python3.13/site-packages/archinstall/__init__.py", line 98, in run_as_a_module
    rc = main()
  File "/usr/lib/python3.13/site-packages/archinstall/__init__.py", line 88, in main
    importlib.import_module(mod_name)
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/usr/lib/python3.13/importlib/__init__.py", line 88, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 1026, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/usr/lib/python3.13/site-packages/archinstall/scripts/guided.py", line 196, in <module>
    guided()
    ~~~~~~^^
  File "/usr/lib/python3.13/site-packages/archinstall/scripts/guided.py", line 191, in guided
    fs_handler.perform_filesystem_operations()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/site-packages/archinstall/lib/disk/filesystem.py", line 75, in perform_filesystem_operations
    self.perform_lvm_operations()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/site-packages/archinstall/lib/disk/filesystem.py", line 145, in perform_lvm_operations
    self._setup_lvm_encrypted(
    ~~~~~~~~~~~~~~~~~~~~~~~~~^
    	self._disk_config.lvm_config,
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    	self._enc_config,
     ^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/python3.13/site-packages/archinstall/lib/disk/filesystem.py", line 157, in _setup_lvm_encrypted
    self._setup_lvm(lvm_config, enc_mods)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/archinstall/lib/disk/filesystem.py", line 187, in _setup_lvm
    self._lvm_create_pvs(lvm_config, enc_mods)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/archinstall/lib/disk/filesystem.py", line 257, in _lvm_create_pvs
    pv_paths |= self._get_all_pv_dev_paths(vg.pvs, enc_mods)
                ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/archinstall/lib/disk/filesystem.py", line 273, in _get_all_pv_dev_paths
    pv_paths.add(pv.safe_dev_path)
                 ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/archinstall/lib/models/device_model.py", line 883, in safe_dev_path
    raise ValueError("Device path was not set")
ValueError: Device path was not set

[2025-05-23 16:46:25] - WARNING - Archinstall experienced the above error. If you think this is a bug, please report it to
https://github.com/archlinux/archinstall and include the log file "/var/log/archinstall/install.log".

Hint: To extract the log from a live ISO 
curl -F'file=@/var/log/archinstall/install.log' https://0x0.st

describe the problem

I am trying an archinstall with lvm on luks following these steps. However it fails with the provided log (don't know if I'm selecting something wrong).

Steps to reproduce:

1. Disk configuration -> Partitioning -> Use a best effort default partition layout -> I select my SSD drive -> I answer no to the question about creating a separate home
2. Disk configuration -> LVM -> Default Layout -> ext4
3. Disk encryption -> Encryption Type -> LVM on LUKS
4. Disk encryption -> Encryption Password -> I set my encryption password
5. Disk encryption -> Partitions -> I select the root partition (the only available)

The configuration works as expected with LVM only (only steps 1 and 2).

[svartkanin]

Can you please provide the entire log in /var/log/archinstall/install.log
Also please make sure you use the latest archinstall release 3.0.6

[elendi1]

Sorry, I forgot to mention that I upgraded the archinstall script before trying the steps above. So it was version 3.0.6.

The full log is at: https://0x0.st/8wCO.log

[svartkanin]

Interesting, so looking at your logs it seems that the partitioning ID, LVM ID and encryption partition ID do not match.

"disk_config": {
        ...
                    {
                        ...
                        "mountpoint": "/",
                        "obj_id": "550f4afc-69b3-4e65-b8e5-79d664f0037d",
                     }
        ],
        "lvm_config": {
            ...
                {
                    "lvm_pvs": [
                        "26b973d3-445c-4773-9337-bcacf22cd50b"
                   ...
                    ]
                }
            ]
        }
    },
    "disk_encryption": {
        "encryption_type": "lvm_on_luks",
        "lvm_volumes": [],
        "partitions": [
            "550f4afc-69b3-4e65-b8e5-79d664f0037d"
        ]
    },

The LVM PVS entry shoud be 550f4afc-69b3-4e65-b8e5-79d664f0037d.
I'm not sure how your config ended up in this state that it's set to 26b973d3-445c-4773-9337-bcacf22cd50b and doesn't reference anything

Are you running this from an ISO?

[correctmost]

#2304 has the same exception and a similar partition mismatch.

[svartkanin]

Yes, but it doesn't use LVM configuration which seems to be triggering factor in this case. But it could be the same source of the problem.

[svartkanin]

@elendi1 would you be able to try out this patch #3503 and see if that fixed it for you?

[svartkanin]

It's merged, so you can test with master

[elendi1]

Interesting, so looking at your logs it seems that the partitioning ID, LVM ID and encryption partition ID do not match.

"disk_config": {
        ...
                    {
                        ...
                        "mountpoint": "/",
                        "obj_id": "550f4afc-69b3-4e65-b8e5-79d664f0037d",
                     }
        ],
        "lvm_config": {
            ...
                {
                    "lvm_pvs": [
                        "26b973d3-445c-4773-9337-bcacf22cd50b"
                   ...
                    ]
                }
            ]
        }
    },
    "disk_encryption": {
        "encryption_type": "lvm_on_luks",
        "lvm_volumes": [],
        "partitions": [
            "550f4afc-69b3-4e65-b8e5-79d664f0037d"
        ]
    },

The LVM PVS entry shoud be 550f4afc-69b3-4e65-b8e5-79d664f0037d. I'm not sure how your config ended up in this state that it's set to 26b973d3-445c-4773-9337-bcacf22cd50b and doesn't reference anything

Are you running this from an ISO?

I was running it from the ipxe build, that downloaded the may ISO. Then I updated archinstall before trying the installation.

Unfortunately I had to install arch on that notebook urgently, so I installed it manually.. I don't know if I can do something to verify the fix without affecting my current install (I suppose not).

[svartkanin]

This #3506 and this #3503 have fixed some issues with resetting the respective menu entries when changing disk configurations and LVM configurations. I couldn't reproduce this issue but issue #2304 looked similar enough to potentially be the same which was fixed with the mentioned patches.
I'll close this for now as fixed, if it pops up again I'll take another look.