gvisor: KVM platform doesn't seem to work

First of all, what a cool project! I’m trying to use the kvm platform backend and running into an issue. I turned logging on and get the following:

I0502 09:38:41.822182    2663 x:0] ***************************
I0502 09:38:41.822305    2663 x:0] Args: [/usr/local/bin/runsc --network=host --debug-log-dir=/tmp/runsc --debug --strace --platform=kvm --root /var/run/docker/runtime-runsc/moby --log /run/docker/containerd/daemon/io.containerd.runtime.v1.linux/moby/1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05/log.json --log-format json start 1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05]
I0502 09:38:41.822353    2663 x:0] PID: 2663
I0502 09:38:41.822379    2663 x:0] UID: 0, GID: 0
I0502 09:38:41.822402    2663 x:0] Configuration:
I0502 09:38:41.822432    2663 x:0]              RootDir: /var/run/docker/runtime-runsc/moby
I0502 09:38:41.822456    2663 x:0]              Platform: kvm
I0502 09:38:41.822483    2663 x:0]              FileAccess: proxy, overlay: false
I0502 09:38:41.822518    2663 x:0]              Network: host, logging: false
I0502 09:38:41.822546    2663 x:0]              Strace: true, max size: 1024, syscalls: []
I0502 09:38:41.822571    2663 x:0] ***************************
D0502 09:38:41.822599    2663 x:0] Load sandbox "/var/run/docker/runtime-runsc/moby" "1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05"
D0502 09:38:41.824406    2663 x:0] Signal sandbox "1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05"
D0502 09:38:41.824445    2663 x:0] Start sandbox "1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05", pid: 2639
D0502 09:38:41.824476    2663 x:0] Executing hook {Path:/usr/bin/dockerd Args:[libnetwork-setkey 1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05 39ab48b69d8788a6b7c56f380259da7713ca1247b463b0f7317b03767a59c2bc] Env:[] Timeout:<nil>}, state: {Version:1.0.1-dev ID:1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05 Status:created Pid:2639 Bundle:/var/run/docker/containerd/daemon/io.containerd.runtime.v1.linux/moby/1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05 Annotations:map[]}
D0502 09:38:41.851177    2663 x:0] Destroy sandbox "1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05"
D0502 09:38:41.851331    2663 x:0] Killing sandbox "1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05"
D0502 09:38:41.851369    2663 x:0] Killing gofer for sandbox "1570d7168cf1a1ef25052cf0433701779f9d7fa11a98c241f88b25bf1c5c8b05"
W0502 09:38:41.852246    2663 x:0] FATAL ERROR: error starting sandbox: failure executing hook "/usr/bin/dockerd", err: exit status 1
stdout:
stderr: time="2018-05-02T09:38:41-07:00" level=fatal msg="no such file or directory"

The command run was docker run --runtime=runsc hello-world

Docker version: Docker version 17.12.0-ce, build c97c6d6

I guess it’s trying to execute the hooks but the fs namespace has already been unbound?