WSL2: docker: Error response from daemon: cgroups: cannot find cgroup mount destination: unknown.

Please fill out the below information:

• Your Windows build number: 18912

• What you're doing and what's happening:

Intermittently, Docker CE quits working with a cgroup error. If I run wsl --shutdown then restart Ubuntu, it will work again.

docker run -it --rm -v /home/user/aks-engine:/go/src/github.com/Azure/aks-engine -w /go/src/github.com/Azure/aks-engine  quay.io/deis/go-dev:v1.22.1 bash
Unable to find image 'quay.io/deis/go-dev:v1.22.1' locally
v1.22.1: Pulling from deis/go-dev
9ff7e2e5f967: Pull complete                                                                                                                                                                      59856638ac9f: Pull complete                                                                                                                                                                      6f317d6d954b: Pull complete                                                                                                                                                                      a9dde5e2a643: Pull complete                                                                                                                                                                      692b28bf9c4d: Pull complete                                                                                                                                                                      5075eab28b88: Pull complete                                                                                                                                                                      Digest: sha256:e872262e17cbc9b562a0d98d7abd75c6ee35eee782f13ba6e0ad0ec5e0b92753
Status: Downloaded newer image for quay.io/deis/go-dev:v1.22.1
docker: Error response from daemon: cgroups: cannot find cgroup mount destination: unknown.
Makefile:55: recipe for target 'dev' failed
make: *** [dev] Error 125

• What's wrong / what should be happening instead:

This should work consistently.

• Docker Version

$ docker version
Client:
 Version:           18.09.6
 API version:       1.39
 Go version:        go1.10.8
 Git commit:        481bc77
 Built:             Sat May  4 02:35:57 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.6
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.8
  Git commit:       481bc77
  Built:            Sat May  4 01:59:36 2019
  OS/Arch:          linux/amd64
  Experimental:     false

Start by reproducing the intermittent failure with the reported docker run command on Windows build 18912, then inspect the cgroup mount state before and after wsl --shutdown. Done means Docker containers run consistently without requiring a WSL restart; the issue names no source files or tests to target.