rally killed everything

$ rally task start test01.yaml
Running Rally version 0.8.2~dev61
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Preparing input task
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Input task is:

---
  NovaServers.boot_and_delete_server:
    -
      args:
        flavor:
            name: "m1.tiny"
        image:
            name: "^Cirros.*$"
        force_delete: false
      runner:
        type: "constant"
        times: 10
        concurrency: 2
      context: {}

Task syntax is correct :)
2017-02-15 00:09:04.308 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Starting:  Task validation.
2017-02-15 00:09:04.324 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Starting:  Task validation of scenarios names.
2017-02-15 00:09:04.328 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Completed: Task validation of scenarios names.
2017-02-15 00:09:04.328 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Starting:  Task validation of syntax.
2017-02-15 00:09:04.333 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Completed: Task validation of syntax.
2017-02-15 00:09:04.333 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Starting:  Task validation of semantic.
2017-02-15 00:09:04.334 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Starting:  Task validation check cloud.
2017-02-15 00:09:04.711 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Completed: Task validation check cloud.
2017-02-15 00:09:04.723 14270 INFO rally.plugins.openstack.context.keystone.existing_users [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Starting:  Enter context: `existing_users`
2017-02-15 00:09:04.940 14270 INFO rally.plugins.openstack.context.keystone.existing_users [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Completed: Enter context: `existing_users`
2017-02-15 00:09:08.428 14270 INFO rally.plugins.openstack.context.keystone.existing_users [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Starting:  Exit context: `existing_users`
2017-02-15 00:09:08.429 14270 INFO rally.plugins.openstack.context.keystone.existing_users [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Completed: Exit context: `existing_users`
2017-02-15 00:09:08.430 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Completed: Task validation of semantic.
2017-02-15 00:09:08.430 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Completed: Task validation.
Task config is valid :)
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Task  4c5aedc1-2071-421d-858c-12fa1edbf218: started
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Benchmarking... This can take a while...

To track task status use:

        rally task status
        or
        rally task detailed

Using task: 4c5aedc1-2071-421d-858c-12fa1edbf218
2017-02-15 00:09:08.444 14270 INFO rally.api [-] Benchmark Task 4c5aedc1-2071-421d-858c-12fa1edbf218 on Deployment 7233e21a-42b1-45d6-b576-e75fca5b4cb7
2017-02-15 00:09:08.448 14270 INFO rally.task.engine [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Starting:  Benchmarking.
2017-02-15 00:09:08.492 14270 INFO rally.task.engine [-] Running benchmark with key:
{
  "kw": {
    "runner": {
      "type": "constant",
      "times": 10,
      "concurrency": 2
    },
    "args": {
      "flavor": {
        "name": "m1.tiny"
      },
      "image": {
        "name": "^Cirros.*$"
      },
      "force_delete": false
    }
  },
  "name": "NovaServers.boot_and_delete_server",
  "pos": 0
}
2017-02-15 00:09:08.503 14270 INFO rally.plugins.openstack.context.keystone.existing_users [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Starting:  Enter context: `existing_users`
2017-02-15 00:09:08.685 14270 INFO rally.plugins.openstack.context.keystone.existing_users [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Completed: Enter context: `existing_users`
2017-02-15 00:09:11.622 14279 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 1 START
2017-02-15 00:09:11.624 14280 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 2 START
2017-02-15 00:09:12.884 14279 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 1 END: Error BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-fa83c634-ba8a-462b-8796-1126f0a1fbcb)
2017-02-15 00:09:12.887 14279 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 3 START
2017-02-15 00:09:13.489 14280 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 2 END: Error BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-998096a4-d82d-4bd9-9e48-f42bacb59a8f)
2017-02-15 00:09:13.492 14280 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 4 START
2017-02-15 00:09:14.430 14279 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 3 END: Error BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-364bf5a2-33b6-47a3-abbe-6338c1ecf7f9)
2017-02-15 00:09:14.433 14279 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 5 START
2017-02-15 00:09:15.088 14280 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 4 END: Error BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-8c88b4d9-176c-4a8b-a3c9-5ed42ae265a5)
2017-02-15 00:09:15.091 14280 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 6 START
2017-02-15 00:09:15.621 14279 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 5 END: Error BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-c4f9af1a-3173-497c-8fd6-313aed87c3cb)
2017-02-15 00:09:15.625 14279 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 7 START
2017-02-15 00:09:16.752 14280 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 6 END: Error BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-7ce8c1ea-8e2e-4bb0-a837-f9926f2c9404)
2017-02-15 00:09:16.753 14280 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 8 START
2017-02-15 00:09:17.623 14279 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 7 END: Error BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-d6a1f46c-286c-4ca8-b280-6c5838f8871c)
2017-02-15 00:09:17.627 14279 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 9 START
2017-02-15 00:09:17.948 14280 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 8 END: Error BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-f328f226-9f1b-48dc-98e9-459b5c58107c)
2017-02-15 00:09:17.950 14280 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 10 START
2017-02-15 00:09:19.115 14279 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 9 END: Error BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-a26f800f-2a6f-4dd8-8257-b59e79a71acc)
2017-02-15 00:09:19.402 14280 INFO rally.task.runner [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | ITER: 10 END: Error BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-23a27d22-cfb4-4b7f-9e26-7d4cabb2b826)
2017-02-15 00:09:19.426 14270 INFO rally.plugins.openstack.context.cleanup.user [-] Task 4c5aedc1-2071-421d-858c-12fa1edbf218 | Starting:  user resources cleanup
packet_write_wait: Connection to xxx.xxx.xxx.xxx port 22: Broken pipe