mstat cannot create new cgroups inside Docker containers

When I am trying to run mstat in a docker container whose image is built from the dockerfile in the repo, I am getting errors like this.

2019/09/10 13:46:18 cgroups.New: mkdir /sys/fs/cgroup/systemd/mstat-7cab2a344e7ed13c: read-only file system

I tried changing the permission of cgroup dir but it is not allowed even though by default I am running as root.

I am running docker-ce Docker version 19.03.2, build 6a30dfc on a host Ubuntu 18.04.

Could you advise what the issue might be? Thanks a bunch!

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