Last night we experienced problems stopping and starting containers, and when I ran a ps I saw this:
4 Z root 4986 1 0 80 0 - 0 exit Aug04 ? 00:01:23 [docker]
We rebooted the machine and then all seemed OK. Today I tried to build a new container and it hung. Tried it multiple times and each time it hung in a different place. I was able to run ‘docker ps’ but ‘docker info’ hung. I tired to remove a container with ‘docker rm’ and that hung, then after that ‘docker ps’ and every docker command hung. A ps showed:
4 S root 4895 1 0 80 0 - 305052 futex_ Aug06 ? 00:01:01 /usr/bin/docker -d
I tried to do ‘sudo service docker restart’ and that hung and now docker is again in the zombie state:
4 Z root 4895 1 0 80 0 - 0 exit Aug06 ? 00:01:24 [docker]
What could be the cause of these sudden problems? How can I debug and fix this? We are dead in the water without docker working reliably.