This looks very much like https://bugs.launchpad.net/mos/+bug/1589449 , but it was fixed in 9.0. I wonder if it's a configuration issue and you have DNS extension enabled in Neutron on some controllers, but disabled on others. This has nothing to do with file injection. Also the failure is on the compute side, so it's not about the code on the new controller either (it can be configuration, though)
This looks very much like https:/ /bugs.launchpad .net/mos/ +bug/1589449 , but it was fixed in 9.0. I wonder if it's a configuration issue and you have DNS extension enabled in Neutron on some controllers, but disabled on others. This has nothing to do with file injection. Also the failure is on the compute side, so it's not about the code on the new controller either (it can be configuration, though)
Please provide your environment for RCA.