Why is "docker stop" killing docker service?

Our CI framework (Jenkins) builds and tests docker containers. We found that stopping the container being used during the test disables the docker service offline, disconnecting the slave from our Jenkins master. Why stop the memcached container and restart the docker service?

What we see at work:

+ docker stop memcached55c7e2ab363be9425039412edc81be1e8601c196
FATAL: java.io.IOException: Unexpected termination of the channel
hudson.remoting.RequestAbortedException: java.io.IOException: Unexpected termination of the channel
    at hudson.remoting.Request.abort(Request.java:295)
    at hudson.remoting.Channel.terminate(Channel.java:814)

      

        
        
        
      

    

/ var / log / docker:

time="2015-07-29T11:43:07-04:00" level=info msg="POST /v1.18/containers/memcached55c7e2ab363be9425039412edc81be1e8601c196/stop?t=10" 
time="2015-07-29T11:43:07-04:00" level=info msg="+job stop(memcached55c7e2ab363be9425039412edc81be1e8601c196)" 
\nWed Jul 29 11:43:52 EDT 2015\n
time="2015-07-29T11:43:53-04:00" level=warning msg="You are running linux kernel version 2.6.32-504.30.3.el6.x86_64, which might be unstable running docker. Please upgrade your kernel to 3.8.0." 
time="2015-07-29T11:43:53-04:00" level=info msg="+job serveapi(unix:///var/run/docker.sock)" 
time="2015-07-29T11:43:53-04:00" level=info msg="Listening for HTTP on unix (/var/run/docker.sock)" 
time="2015-07-29T11:43:53-04:00" level=info msg="+job init_networkdriver()" 
time="2015-07-29T11:43:53-04:00" level=info msg="-job init_networkdriver() = OK (0)" 
time="2015-07-29T11:43:53-04:00" level=info msg="Loading containers: start." 
...time="2015-07-29T11:43:53-04:00" level=error msg="Error unmounting device 23607b95df9a186d80bb346c914cd01e7631c4fec3968bde29df7bc327f0b820: UnmountDevice: device not-mounted id 23607b95df9a186d80bb346c914cd01e7631c4fec3968bde29df7bc327f0b820" 
.time="2015-07-29T11:43:53-04:00" level=error msg="Error unmounting device d01f73b589a9d598cc97752ce554b5c5dcf1b51d3991c1dee54880bb7d718fb7: UnmountDevice: device not-mounted id d01f73b589a9d598cc97752ce554b5c5dcf1b51d3991c1dee54880bb7d718fb7" 

time="2015-07-29T11:43:53-04:00" level=info msg="Loading containers: done." 
time="2015-07-29T11:43:53-04:00" level=info msg="docker daemon: 1.6.2 7c8fca2/1.6.2; execdriver: native-0.2; graphdriver: devicemapper" 
time="2015-07-29T11:43:53-04:00" level=info msg="+job acceptconnections()" 
time="2015-07-29T11:43:53-04:00" level=info msg="-job acceptconnections() = OK (0)" 
time="2015-07-29T11:43:53-04:00" level=info msg="Daemon has completed initialization" 

      

        
        
        
      

    

Versions:

-bash-4.1$ uname -a
Linux ip-172-17-70-142.ec2.internal 2.6.32-504.30.3.el6.x86_64 #1 SMP Wed Jul 15 10:13:09 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
-bash-4.1$ docker --version
Docker version 1.6.2, build 7c8fca2/1.6.2
-bash-4.1$ docker version
Client version: 1.6.2
Client API version: 1.18
Go version (client): go1.4.2
Git commit (client): 7c8fca2/1.6.2
OS/Arch (client): linux/amd64
Server version: 1.6.2
Server API version: 1.18
Go version (server): go1.4.2
Git commit (server): 7c8fca2/1.6.2
OS/Arch (server): linux/amd64
-bash-4.1$ docker info
Containers: 2
Images: 65
Storage Driver: devicemapper
 Pool Name: docker-202:64-936887-pool
 Pool Blocksize: 65.54 kB
 Backing Filesystem: extfs
 Data file: /dev/loop0
 Metadata file: /dev/loop1
 Data Space Used: 1.597 GB
 Data Space Total: 107.4 GB
 Data Space Available: 12.44 GB
 Metadata Space Used: 3.584 MB
 Metadata Space Total: 2.147 GB
 Metadata Space Available: 2.144 GB
 Udev Sync Supported: true
 Data loop file: /var/lib/docker/devicemapper/devicemapper/data
 Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
 Library Version: 1.02.89-RHEL6 (2014-09-01)
Execution Driver: native-0.2
Kernel Version: 2.6.32-504.30.3.el6.x86_64
Operating System: <unknown>
CPUs: 2
Total Memory: 7.166 GiB
Name: ip-172-17-70-142.ec2.internal
ID: X4UG:BKKW:5ZQX:VXRV:3GYP:FU3J:7FJC:4FFM:CK4D:SWSH:KIHW:IPNE
Username: dxbuildmaster
Registry: [https://index.docker.io/v1/]