Description of problem: docker commands hang on Ubuntu

docker version: Version: 1.9.0-dev Git commit: 1529343

docker info: not available (command hangs)

uname -a: Linux warhorse 3.19.0-30-generic #34-Ubuntu SMP Fri Oct 2 22:08:41 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Environment details (AWS, VirtualBox, physical, etc.):

Physical Ubuntu Vivid (15.04) system.

How reproduce:

I am using the docker experimental build on Ubuntu Vivid (15.04). Today I am not able to complete any docker commands they all hang indefinitely.

Steps to Reproduce:

1. sudo docker -D info (hangs)
2. sudo docker version (hangs)
3. sudo systemctl restart docker
   Job for docker.service failed. See “systemctl status docker.service” and “journalctl -xe” for details.

Actual Results:

All the docker client commands hang. The docker daemon issues an error but is running.

Expected Results:

The docker commands should work even if they can not contact the daemon.

Additional info:

This morning I am unable to run any docker commands successfully. I suspected the docker daemon might have problems so I restarted that service and got a message that it failed:

$ sudo systemctl restart docker Job for docker.service failed. See “systemctl status docker.service” and “journalctl -xe” for details.

Everything appears to be running checking docker.service and ps shows the docker daemon running.

$ sudo systemctl status docker.service -l ● docker.service - Docker Application Container Engine Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Wed 2015-10-07 13:39:25 CDT; 16s ago Docs: https://docs.docker.com Process: 25371 ExecStart=/usr/bin/docker daemon -H fd:// (code=exited, status=2) Main PID: 25371 (code=exited, status=2)

Oct 07 13:37:55 warhorse systemd[1]: Starting Docker Application Container Engine… Oct 07 13:37:55 warhorse docker[25371]: time=“2015-10-07T13:37:55-05:00” level=warning msg=“Running experimental build” Oct 07 13:39:25 warhorse systemd[1]: docker.service start operation timed out. Terminating. Oct 07 13:39:25 warhorse systemd[1]: docker.service: main process exited, code=exited, status=2/INVALIDARGUMENT Oct 07 13:39:25 warhorse systemd[1]: Failed to start Docker Application Container Engine. Oct 07 13:39:25 warhorse systemd[1]: Unit docker.service entered failed state. Oct 07 13:39:25 warhorse systemd[1]: docker.service failed.

According to syslog the last start of the Docker Application Engine failed. /var/log/syslog:
…
Oct 7 13:37:55 warhorse systemd[1]: docker.service: main process exited, code=exited, status=2/INVALIDARGUMENT Oct 7 13:37:55 warhorse systemd[1]: Unit docker.service entered failed state. Oct 7 13:37:55 warhorse systemd[1]: docker.service failed. Oct 7 13:37:55 warhorse systemd[1]: Stopping Docker Socket for the API. Oct 7 13:37:55 warhorse systemd[1]: Starting Docker Socket for the API. Oct 7 13:37:55 warhorse systemd[1]: Listening on Docker Socket for the API. Oct 7 13:37:55 warhorse systemd[1]: Starting Docker Application Container Engine… Oct 7 13:37:55 warhorse docker[25371]: time=“2015-10-07T13:37:55-05:00” level=warning msg=“Running experimental build” Oct 7 13:39:25 warhorse systemd[1]: docker.service start operation timed out. Terminating. Oct 7 13:39:25 warhorse systemd[1]: docker.service: main process exited, code=exited, status=2/INVALIDARGUMENT Oct 7 13:39:25 warhorse systemd[1]: Failed to start Docker Application Container Engine. Oct 7 13:39:25 warhorse systemd[1]: Unit docker.service entered failed state. Oct 7 13:39:25 warhorse systemd[1]: docker.service failed.

All docker commands hang for me. Is there any other file or information you need to diagnose this problem? Are there any workarounds at this time?