Comment 6 for bug 1450438

Removed nova and oslo-incubator because the only change was in oslo.service:

https://review.openstack.org/#/c/190372/

And the fix has been here since 0.1.0.

Nova 12.0.0 requires oslo.service>=0.7.0 so you should have the fix:

https://github.com/openstack/nova/blob/12.0.0/requirements.txt#L48

If it doesn't fix it, I'd open a new bug and refer to this one along with the details / recreate scenario / logs of what you're seeing.