Docker process dies with exit code 137, but no OOM error

I’m executing the following subprocess.

    print(f'runner executing the simulation for {simulation_file_url} ')
    process = Popen(['gridlabd', simulation_file_url], cwd=temp_dir,
                    stdout=PIPE, stderr=PIPE)

The main app periodically dies with code 137. I’m running this on Ubuntu 17.10 in Docker. I inspected the Docker container and I didn’t see anything like an out of memory issue. The subprocess is a C++ program installed locally and is consuming up to 800M of memory. I have about 10G available in my VirtualBox VM where this Docker container is running. So it doesn’t appear to be a memory issue on my host, unless there’s some memory setting in Docker I need to change.

web_1  | runner executing the simulation for /code/components/g_sim_runner/test/simulation_models/i/8 
g-server_web_1 exited with code 137

docker inspect 8eeb7235b12d

[
    {
        "Id": "8eeb7235b12d84b85b9a7b8f90e56e204ceceaf31638451df83fd0f537477dde",
        "Created": "2018-10-12T20:17:57.038522287Z",
        "Path": "./start.sh",
        "Args": [],
        "State": {
            "Status": "exited",
            "Running": false,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 0,
            "ExitCode": 137,
            "Error": "",
            "StartedAt": "2018-10-12T21:16:08.144554771Z",
            "FinishedAt": "2018-10-12T21:16:58.272396915Z"
        },
        "Image": "sha256:8271cae1b4b9ecf54d98913d56903d40befd9ae29f1940c8dc6721a518d8c855",
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        "HostsPath": "/var/lib/docker/containers/8eeb7235b12d84b85b9a7b8f90e56e204ceceaf31638451df83fd0f537477dde/hosts",
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        "Name": "/g-server_web_1",
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        "MountLabel": "",
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            "LogConfig": {
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                "Config": {}
            },
            "NetworkMode": "g-server_default",
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                        "HostPort": "5000"
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                        "HostPort": "5432"
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            "RestartPolicy": {
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            "BlkioWeight": 0,
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            "CpuPeriod": 0,
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            "CpusetCpus": "",
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            "Devices": null,
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            "CpuCount": 0,
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            "MaskedPaths": [
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            "ReadonlyPaths": [
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                "MergedDir": "/var/lib/docker/overlay2/358589d9656a048a81b98b2adeba4b234cadf0059e99c556b9ad7b19af57c682/merged",
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                "WorkDir": "/var/lib/docker/overlay2/358589d9656a048a81b98b2adeba4b234cadf0059e99c556b9ad7b19af57c682/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [
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                "Type": "bind",
                "Source": "/home/jorge/projects/g/g-server",
                "Destination": "/code",
                "Mode": "rw",
                "RW": true,
                "Propagation": "rprivate"
            }
        ],
        "Config": {
            "Hostname": "8eeb7235b12d",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "5000/tcp": {},
                "5432/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
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            "Env": [
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                "PATH=/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "LANG=C.UTF-8",
                "GPG_KEY=0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D",
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            ],
            "Cmd": [
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            "ArgsEscaped": true,
            "Image": "g-server_web",
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            "Labels": {
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                "com.docker.compose.container-number": "1",
                "com.docker.compose.oneoff": "False",
                "com.docker.compose.project": "g-server",
                "com.docker.compose.service": "web",
                "com.docker.compose.version": "1.22.0"
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        },
        "NetworkSettings": {
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]