Seems to be related with aufs driver that is not loaded in 4.9 ?
$this->bbcode_second_pass_code('', '# modprobe aufs
modprobe: FATAL: Module aufs not found in directory /lib/modules/4.9.11-1-ARCH
')
$this->bbcode_second_pass_code('', 'Feb 24 13:01:00 raspberrypi2 systemd[1]: docker.service: Failed with result 'exit-code'.
Feb 24 13:01:00 raspberrypi2 systemd[1]: docker.service: Unit entered failed state.
Feb 24 13:01:00 raspberrypi2 systemd[1]: Failed to start Docker Application Container Engine.
Feb 24 13:01:00 raspberrypi2 systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
Feb 24 13:01:00 raspberrypi2 dockerd[1689]: Error starting daemon: error initializing graphdriver: driver not supported
Feb 24 13:01:00 raspberrypi2 dockerd[1689]: time="2017-02-24T13:01:00.578753280+01:00" level=error msg="[graphdriver] prior storage driver aufs failed: driver not supported"
Feb 24 13:00:59 raspberrypi2 dockerd[1689]: time="2017-02-24T13:00:59.548763124+01:00" level=info msg="libcontainerd: new containerd process, pid: 1701"
Feb 24 13:00:59 raspberrypi2 systemd[1]: Starting Docker Application Container Engine...')