id = 2400
title = "Qemu fails to boot snapshot image if its header is qcow2 but its payload and backing image extension are luks"
state = "opened"
created_at = "2024-06-20T13:52:55.532Z"
closed_at = "n/a"
labels = []
url = "https://gitlab.com/qemu-project/qemu/-/issues/2400"
host-os = "Windows 11 23H2"
host-arch = "x64"
qemu-version = "v9.0.0-12054-g923cf646f4"
guest-os = "n/a"
guest-arch = "n/a"
description = """Qemu fails to recognize snapshot image E:\\\\test_snapshot.qcow2 saying Volume is not in LUKS format

You need three commands to reproduce:

`qemu-img create -f luks --object secret,id=sec0,data=123 -o key-secret=sec0 E:\\test.luks 1G`

`qemu-img create --object secret,id=sec0,data=123 -f qcow2 -o encrypt.format=luks,encrypt.key-secret=sec0 -b E:\\test.luks -F luks E:\\test_snapshot.qcow2`

`qemu-system-x86_64 -drive file=E:\\test_snapshot.qcow2,format=luks,key-secret=sec0 -object secret,id=sec0,data=123`

This error is printed:

`qemu-system-x86_64: -drive file=E:\\test_snapshot.qcow2,format=luks,key-secret=sec0: Volume is not in LUKS format`

But fourth command shows that payload of `E:\\test_snapshot.qcow2` has LUKS format:

`qemu-img info E:\\test_snapshot.qcow2`

\\[output\\]

```bash
virtual size: 1 GiB (1073741824 bytes)
disk size: 2.25 MiB
encrypted: yes
cluster_size: 65536
backing file: E:\\test.luks
backing file format: luks
Format specific information:
    compat: 1.1
    compression type: zlib
    lazy refcounts: false
    refcount bits: 16
    encrypt:
        ivgen alg: plain64
        detached header: false
        hash alg: sha256
        cipher alg: aes-256
        uuid: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
        format: luks
        cipher mode: xts ...
```"""
reproduce = "n/a"
additional = "n/a"