Comment 2 for bug 1880828

It seems that the image download produced a file '/var/lib/nova/instance s/_base/9b8156fbecaa194804a637226c8ffded93a57489.part' that is not really usable by qemu-img convert. If you still have that file (or can reproduce the problem) then it would be nice to compare hash of the image in glance and the hash of the downloaded .part file. Also if you reproduce could you please set debug=True in the [DEFAULT] section in the nova.conf of your nova-compute service and attach the logs?

Setting this to Invalid until the requested input is provided, please set it back to New when you did that.