With versions:

docker.x86_64                                                                       2:1.12.3-22.git7b5044b.fc26
docker-common.x86_64                                                                2:1.12.3-22.git7b5044b.fc26
docker-rhel-push-plugin.x86_64                                                      2:1.12.3-22.git7b5044b.fc26

We have:

Nov 26 22:56:45 vrici.digitalkingdom.org dockerd-current[11032]: time="2016-11-26T22:56:45.682711980-08:00" level=warning msg="Unable to locate plugin: rhel-push-plugin, retrying in 1s"
Nov 26 22:56:46 vrici.digitalkingdom.org dockerd-current[11032]: time="2016-11-26T22:56:46.683263572-08:00" level=warning msg="Unable to locate plugin: rhel-push-plugin, retr
ying in 2s"
Nov 26 22:56:46 vrici.digitalkingdom.org audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=fprintd comm="systemd" e
xe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Nov 26 22:56:48 vrici.digitalkingdom.org dockerd-current[11032]: time="2016-11-26T22:56:48.683857407-08:00" level=warning msg="Unable to locate plugin: rhel-push-plugin, retr
ying in 4s"
Nov 26 22:56:52 vrici.digitalkingdom.org dockerd-current[11032]: time="2016-11-26T22:56:52.684470282-08:00" level=warning msg="Unable to locate plugin: rhel-push-plugin, retr
ying in 8s"
Nov 26 22:57:00 vrici.digitalkingdom.org dockerd-current[11032]: time="2016-11-26T22:57:00.685048201-08:00" level=error msg="AuthZRequest for GET /v1.24/containers/json retur
ned error: plugin rhel-push-plugin failed with error: plugin not found"
Nov 26 22:57:00 vrici.digitalkingdom.org dockerd-current[11032]: time="2016-11-26T22:57:00.685155617-08:00" level=error msg="Handler for GET /v1.24/containers/json returned e
rror: plugin rhel-push-plugin failed with error: plugin not found"

And then docker hangs on all commands.

Fixed by removing:

--authorization-plugin=rhel-push-plugin

from /usr/lib/systemd/system/docker.serviced