Extended networking tests fail on "Path /var/run/openvswitch/br0.mgmt is mounted on /run but it is not a shared or slave mount."

[dcbw]

Oct 31 11:16:25.304: INFO: At 2016-10-31 11:15:44 -0400 EDT - event for flow-checkl35gu: {kubelet nettest-node-1} FailedSync: Error syncing pod, skipping: failed to "StartContainer" for "flow-check" with RunContainerError: "runContainer: Error response from daemon: Cannot start container ec598cdedcc673560b770debe1b1d705e3fc0751182dcc82b0ba5c740ec846f1: Path /var/run/openvswitch/br0.mgmt is mounted on /run but it is not a shared or slave mount."

[marun]

I'm seeing this in the post-merge job, which suggests this is a problem in master rather than just #11613. I'm puzzled what changed to cause this apparent regression.

[liggitt]

Did docker just change to 1.12?

[marun]

Hmm, that may be it. That is the version shown on the failing jobs.

[marun]

To be clear, this is only a problem for dind clusters and the fix is to ensure /run is mounted with shared propagation as per the fix included with @dcbw's PR. Only the ovs e2e tests are affected, and they are only run post-merge or by [testextended][extended:networking].

[marun]

The fix for this merged with #11613