[Bug 1829829] Re: Ubuntu CI has been flaky for a week

[Evgeny Vereshchagin]

I agree ideally the test should be fixed but it's been flaky for a
couple of years and I didn't notice anyone who would be willing to try
to figure it out. I think it's time to admit nobody cares. Even if I'm
totally wrong and someone is interested in getting it to work on Ubuntu
CI, it should be possible to turn it off globally so as not to annoy
contributors with known issues they shouldn't even have to care about
and keep trying to reproduce it "locally" (as we do on CentOS CI, Travis
CI, Azure Pipelines and so on and so forth).

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https://bugs.launchpad.net/bugs/1829829

Title:
  Ubuntu CI has been flaky for a week

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  It was originally reported in https://github.com/systemd/systemd/pull/12583#issuecomment-492949206 5 days ago. To judge from the logs VMs can't be rebooted there:
  ```
  Ubuntu 18.04.2 LTS autopkgtest ttyS0

  autopkgtest login:
  ---------------------------------------------------
  ------- nova show 91e76a78-d05c-412a-b383-55a26010ae69 (adt-bionic-amd64-systemd-upstream-20190516-051604) ------
  +--------------------------------------+------------------------------------------------------------------------------------+
  | Property                             | Value                                                                              |
  +--------------------------------------+------------------------------------------------------------------------------------+
  | OS-DCF:diskConfig                    | MANUAL                                                                             |
  | OS-EXT-AZ:availability_zone          | nova                                                                               |
  | OS-EXT-SRV-ATTR:host                 | euler                                                                              |
  | OS-EXT-SRV-ATTR:hypervisor_hostname  | euler.lcy01.scalingstack                                                           |
  | OS-EXT-SRV-ATTR:instance_name        | instance-003d216a                                                                  |
  | OS-EXT-STS:power_state               | 1                                                                                  |
  | OS-EXT-STS:task_state                | -                                                                                  |
  | OS-EXT-STS:vm_state                  | active                                                                             |
  | OS-SRV-USG:launched_at               | 2019-05-16T07:00:42.000000                                                         |
  | OS-SRV-USG:terminated_at             | -                                                                                  |
  | accessIPv4                           |                                                                                    |
  | accessIPv6                           |                                                                                    |
  | config_drive                         |                                                                                    |
  | created                              | 2019-05-16T07:00:33Z                                                               |
  | flavor                               | autopkgtest (f878e70e-9991-46e0-ba02-8ea159a71656)                                 |
  | hostId                               | 1722c5f2face86c3fc9f338ae96835924721512372342f664e6941bd                           |
  | id                                   | 91e76a78-d05c-412a-b383-55a26010ae69                                               |
  | image                                | adt/ubuntu-bionic-amd64-server-20190516.img (d00bf12c-467e-433f-a4f5-15720f13bff1) |
  | key_name                             | testbed-juju-prod-ues-proposed-migration-machine-11                                |
  | metadata                             | {}                                                                                 |
  | name                                 | adt-bionic-amd64-systemd-upstream-20190516-051604                                  |
  | net_ues_proposed_migration network   | 10.42.40.13                                                                        |
  | os-extended-volumes:volumes_attached | []                                                                                 |
  | progress                             | 0                                                                                  |
  | security_groups                      | autopkgtest at lcy01-27.secgroup                                                      |
  | status                               | ACTIVE                                                                             |
  | tenant_id                            | afaef86b96dd4828a1ed5ee395ea1421                                                   |
  | updated                              | 2019-05-16T07:00:42Z                                                               |
  | user_id                              | 8524250971084851b3792a68fbc398dd                                                   |
  +--------------------------------------+------------------------------------------------------------------------------------+
  ---------------------------------------------------
  <VirtSubproc>: failure: Timed out on waiting for ssh connection
  autopkgtest [07:07:45]: ERROR: testbed failure: cannot send to testbed: [Errno 32] Broken pipe
  ```

  Though judging by https://github.com/systemd/systemd/pull/12626, it
  appears that sometimes the tests pass.

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