layer-flannel fails attempting to remove ephemeral container

[lazypower]

root@ip-172-31-16-53:/var/lib/juju/agents/unit-kubernetes-1/charm# hooks/etcd-relation-changed

• docker -H unix:///var/run/docker-bootstrap.sock run --net=host --rm -v /etc/ssl/flannel:/tls -e ETCDCTL_CA_FILE=/tls/client-ca.pem -e ETCDCTL_CERT_FILE=/tls/client-cert.pem -e ETCDCTL_KEY_FILE=/tls/cli$
  nt-key.pem gcr.io/google_containers/etcd:2.0.12 etcdctl -C https://172.31.19.45:2379,https://172.31.14.149:2379 set /coreos.com/network/config '{ "Network": "10.1.0.0/16", "Backend": {"Type": "vxlan"}}'
  { "Network": "10.1.0.0/16", "Backend": {"Type": "vxlan"}}
  Removing flannel_flannel_1
  Recreating 762c5f916d4e_762c5f916d4e_flannel_flannel_1

ERROR: for flannel b'Unable to remove filesystem for 762c5f916d4e7a3d82b32e2a0bae615f87de6b5738fe9e33152468f10ecb4e60: remove /var/lib/docker-bootstrap/containers/762c5f916d4e7a3d82b32e2a0bae615f87de6b57
38fe9e33152468f10ecb4e60/shm: device or resource busy'

This appears to be related to: moby/moby#17823