kubernetes: Namespace stuck on terminating on delete

Is this a request for help? (If yes, you should use our troubleshooting guide and community support channels, see http://kubernetes.io/docs/troubleshooting/.): No

What keywords did you search in Kubernetes issues before filing this one? (If you have found any duplicates, you should instead reply there.): namespace terminating 1.4.6

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Is this a BUG REPORT or FEATURE REQUEST? (choose one): Bug report

Kubernetes version (use kubectl version):

Client Version: version.Info{Major:"1", Minor:"3", GitVersion:"v1.3.4", GitCommit:"dd6b458ef8dbf24aff55795baa68f83383c9b3a9", GitTreeState:"clean", BuildDate:"2016-08-01T16:45:16Z", GoVersion:"go1.6.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"4", GitVersion:"v1.4.6", GitCommit:"e569a27d02001e343cb68086bc06d47804f62af6", GitTreeState:"clean", BuildDate:"2016-11-12T05:16:27Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}

Environment:

• Cloud provider or hardware configuration: GKE
• OS (e.g. from /etc/os-release): Ubuntu 16.04
• Kernel (e.g. uname -a): 4.4.0-47-generic
• Install tools: N.A
• Others: N.A

What happened: After upgrading our cluster from 1.4.0 to 1.4.6, when deleting a namespace it gets stuck in Terminating.

What you expected to happen: Have the namespace deleted.

How to reproduce it (as minimally and precisely as possible): Upgrade from 1.4.0 to 1.4.6 and delete a namespace.

Anything else do we need to know: I found https://github.com/kubernetes/kubernetes/issues/19317 and https://github.com/kubernetes/kubernetes/issues/37278, but one is specific to thirdpartyresources and the other one to openshift. This issue happens on all namespaces with no special finalizer or thirdpartyresource.