Comment 4 for bug 1888665

Please use the provided template when creating bugs in future.

Can you confirm which version of Nova and Cinder are used in this environment?

The volume staying in a `detaching` state after this exception is a valid Nova bug IMHO.

However `cinderclient.exceptions.ClientException: Gateway Time-out (HTTP 504)` suggests that Cinder API is timing out while waiting for Cinder Volume to remove the volume attachment on the backend. Can you trace a request through on the Cinder side to confirm this and maybe create a fresh bug for any issues you discover there?

I'll use this bug to ensure we call the roll detaching API to ensure the volume remains marked as `in-use`.