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Nice analysis.
You're correct that when we shelve an instance, we create a snapshot image, starting in the API:
https:/
That snapshot image_id is passed down to the compute service to do the actual snapshot and upload from the virt driver:
https:/
We then store that snapshot image_id in the instance system_metadata for later when it's unshleved:
https:/
When we unshelve, we get that snapshot image from glance:
https:/
We then use that to update the instance.image_ref field to point at the snapshot image:
https:/
It looks like the problem is that we then reset the instance.image_ref to the old image id before we unshelved:
https:/
I have no idea why we do that, and that's probably the bug.