On 08.11.19 09:53, Kevin Wolf wrote:
> Test that doing a second blockdev-snapshot doesn't make the first
> overlay's backing file go away.
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>  tests/qemu-iotests/273     |  76 +++++++++
>  tests/qemu-iotests/273.out | 337 +++++++++++++++++++++++++++++++++++++
>  tests/qemu-iotests/group   |   1 +
>  3 files changed, 414 insertions(+)
>  create mode 100755 tests/qemu-iotests/273
>  create mode 100644 tests/qemu-iotests/273.out

[...]

> +                "format-specific": {
> +                    "type": "IMGFMT",
> +                    "data": {
> +                        "compat": "1.1",
> +                        "lazy-refcounts": false,
> +                        "refcount-bits": 16,
> +                        "corrupt": false
> +                    }

I get a mismatch here with -o compat=0.10 or -o refcount_bits=1.

Max