+1
To reproduce (with Linux 3.16 or newer):

mkdir /sys/fs/cgroup/unified
mount -t cgroup -o __DEVEL__sane_behavior cgroup /sys/fs/cgroup/unified
docker run --rm busybox

Docker 1.8.1 prints:

Timestamp: 2015-10-05 19:44:19.240101459 +0000 UTC
Code: System error

Message: no subsystem for mount

Frames:
---
0: setupRootfs
Package: github.com/opencontainers/runc/libcontainer
File: rootfs_linux.go@37
---
1: Init
Package: github.com/opencontainers/runc/libcontainer.(*linuxStandardInit)
File: standard_init_linux.go@52
---
2: StartInitialization
Package: github.com/opencontainers/runc/libcontainer.(*LinuxFactory)
File: factory_linux.go@242
---
3: initializer
Package: github.com/docker/docker/daemon/execdriver/native
File: init.go@35
---
4: Init
Package: github.com/docker/docker/pkg/reexec
File: reexec.go@26
---
5: main
Package: main
File: docker.go@19
---
6: main
Package: runtime
File: proc.go@63
---
7: goexit
Package: Error response from daemon: Cannot start container e218e2e9e406121a1732013d1388648da84b31bc8ad5342bc6e5b73216a2f857: [8] System error: no subsystem for mount

Docker does not run with unified cgroup hierarchy #16238

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