Comment 24 for bug 1670627

@krims0n: are you on stable/ocata or master (pike)? When the instance.destroy() fails we do a rollback of the decremented quota, here:

https://review.openstack.org/#/c/445236/1/nova/compute/api.py@1816

That's on Ocata. Are you hitting something besides an InstanceNotFound? That would probably cause an issue and we wouldn't rollback the quota change.

Please report a new bug with details on what the failure was.