Mount fails with no such device error.

[ominitay]

I am trying to run Kiss from a BTRFS partition on an LVM logical volume. I get dropped into an emergency shell, with the error that the device being mounted doesn't exist. I can see the device in /dev. From the emergency shell, I get the same error if I try to mount the root partition manually, though this doesn't happen to the non-lvm, non-btrfs, EFI partition (that mounts fine).

My config is:

compress="xz --check=crc32"

root="UUID=042f9fb5-6657-47d9-b81a-cebd86e9b94f"
root_type=btrfs

hooks="eudev lvm"

lvm_config=1
lvm_name=kissroot
lvm_group=kissvg

The output of blkid | grep kissroot is

/dev/mapper/kissvg-kissroot: UUID="042f9fb5-6657-47d9-b81a-cebd86e9b94f" UUID_SUB="895e196c-be51-44f5-ad78-7bca26325cec" BLOCK_SIZE="4096" TYPE="btrfs"

[ominitay]

This is the output I get ^

[illiliti]

I'm pretty sure something wrong with kernel configuration or partition layout. Look, mount(2) fails with ENODEV error (No such device). According to https://man7.org/linux/man-pages/man2/mount.2.html this means that filesystem is not supported in kernel or corresponding module wasn't loaded.

Are you using kernel with builtin or external modules?

[ominitay]

Oh, I have modules in /lib/modules/5.10.16, so I'll try rebuilding with monolith=0...

[ominitay]

Unfortunately that did not fix it. Do you think I may have misconfigured my kernel perhaps?
I'm going to build the kernel I use on my Arch install, which is known to work, just to reduce the factors.

[ominitay]

🤦‍♀️ I realised that I hadn't built the Kernel with BTRFS support. Sorry for making this issue.

[illiliti]

All good :)