Docker container hangs with no apparent fault

Update: Problem is reported on version 1.9.1 and is not present in up-to-date versions of Docker.

I have an docker app running in elasticbeanstalk that hangs after about 10-11 days of uptime.

The app runs a cron job every minute. There is no long-running application process (of mine).

Once it has hung, it no longer responds to HTTP requests.

The following docker commands hang: top, exec, restart

docker logs responds but shows no error.

I do not know how to debug further from this point. Any ideas?

docker inspect shows:

{
    "Id": "a9e7ed019ce543073c16507036d1a5579817a0e0abf79e6f79949bcc96dca444",
    "Created": "2016-06-16T22:29:57.448398251Z",
    "Path": "/usr/local/bin/init.sh",
    "Args": [],
    "State": {
        "Status": "running",
        "Running": true,
        "Paused": false,
        "Restarting": false,
        "OOMKilled": false,
        "Dead": false,
        "Pid": 4406,
        "ExitCode": 0,
        "Error": "",
        "StartedAt": "2016-06-16T22:29:58.459393626Z",
        "FinishedAt": "0001-01-01T00:00:00Z"
    },
    "Image": "6aa1c5468fbe4102e7428d4325f666868498b9880c9dc3f14c30c2a6804a25a5",
    "ResolvConfPath": "/var/lib/docker/containers/a9e7ed019ce543073c16507036d1a5579817a0e0abf79e6f79949bcc96dca444/resolv.conf",
    "HostnamePath": "/var/lib/docker/containers/a9e7ed019ce543073c16507036d1a5579817a0e0abf79e6f79949bcc96dca444/hostname",
    "HostsPath": "/var/lib/docker/containers/a9e7ed019ce543073c16507036d1a5579817a0e0abf79e6f79949bcc96dca444/hosts",
    "LogPath": "/var/lib/docker/containers/a9e7ed019ce543073c16507036d1a5579817a0e0abf79e6f79949bcc96dca444/a9e7ed019ce543073c16507036d1a5579817a0e0abf79e6f79949bcc96dca444-json.log",
    "Name": "/cranky_hugle",
    "RestartCount": 0,
    "Driver": "devicemapper",
    "ExecDriver": "native-0.2",
    "MountLabel": "",
    "ProcessLabel": "",
    "AppArmorProfile": "",
    "ExecIDs": [
        "8de1c20fc2c90e7a41c709e226ecd3401db18c6e0044527b4cc205d15167ac6d"
    ],
    "HostConfig": {
        "Binds": null,
        "ContainerIDFile": "",
        "LxcConf": [],
        "Memory": 0,
        "MemoryReservation": 0,
        "MemorySwap": 0,
        "KernelMemory": 0,
        "CpuShares": 0,
        "CpuPeriod": 0,
        "CpusetCpus": "",
        "CpusetMems": "",
        "CpuQuota": 0,
        "BlkioWeight": 0,
        "OomKillDisable": false,
        "MemorySwappiness": -1,
        "Privileged": false,
        "PortBindings": {},
        "Links": null,
        "PublishAllPorts": false,
        "Dns": [],
        "DnsOptions": [],
        "DnsSearch": [],
        "ExtraHosts": null,
        "VolumesFrom": null,
        "Devices": [],
        "NetworkMode": "default",
        "IpcMode": "",
        "PidMode": "",
        "UTSMode": "",
        "CapAdd": null,
        "CapDrop": null,
        "GroupAdd": null,
        "RestartPolicy": {
            "Name": "no",
            "MaximumRetryCount": 0
        },
        "SecurityOpt": null,
        "ReadonlyRootfs": false,
        "Ulimits": null,
        "LogConfig": {
            "Type": "json-file",
            "Config": {}
        },
        "CgroupParent": "",
        "ConsoleSize": [
            0,
            0
        ],
        "VolumeDriver": ""
    },
    "GraphDriver": {
        "Name": "devicemapper",
        "Data": {
            "DeviceId": "46",
            "DeviceName": "docker-202:1-263679-a9e7ed019ce543073c16507036d1a5579817a0e0abf79e6f79949bcc96dca444",
            "DeviceSize": "107374182400"
        }
    },
    "Mounts": [],
    "Config": {
        "Hostname": "a9e7ed019ce5",
        "Domainname": "",
        "User": "",
        "AttachStdin": false,
        "AttachStdout": false,
        "AttachStderr": false,
        "ExposedPorts": {
            "443/tcp": {},
            "80/tcp": {}
        },
        "Tty": false,
        "OpenStdin": false,
        "StdinOnce": false,
        "Env": [
            "ENV=prd",
            "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
            "APACHE_RUN_USER=www-data",
            "APACHE_RUN_GROUP=www-data",
            "APACHE_LOG_DIR=/var/log/apache2",
            "GIT_REV=76bf2a3207482a0dfc06551374056480946825ff"
        ],
        "Cmd": [
            "/usr/local/bin/init.sh"
        ],
        "Image": "6aa1c5468fbe",
        "Volumes": null,
        "WorkingDir": "",
        "Entrypoint": null,
        "OnBuild": null,
        "Labels": {},
        "StopSignal": "SIGTERM"
    },
    "NetworkSettings": {
        "Bridge": "",
        "SandboxID": "*********",
        "HairpinMode": false,
        "LinkLocalIPv6Address": "",
        "LinkLocalIPv6PrefixLen": 0,
        "Ports": {
            "443/tcp": null,
            "80/tcp": null
        },
        "SandboxKey": "/var/run/docker/netns/*********",
        "SecondaryIPAddresses": null,
        "SecondaryIPv6Addresses": null,
        "EndpointID": "*********",
        "Gateway": "172.17.0.1",
        "GlobalIPv6Address": "",
        "GlobalIPv6PrefixLen": 0,
        "IPAddress": "172.17.0.2",
        "IPPrefixLen": 16,
        "IPv6Gateway": "",
        "MacAddress": "*********",
        "Networks": {
            "bridge": {
                "EndpointID": "*********",
                "Gateway": "172.17.0.1",
                "IPAddress": "172.17.0.2",
                "IPPrefixLen": 16,
                "IPv6Gateway": "",
                "GlobalIPv6Address": "",
                "GlobalIPv6PrefixLen": 0,
                "MacAddress": "*********"
            }
        }
    }
}
]