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

[Evgeny Vereshchagin]

Just to clarify, I think that it would be better to turn off the test
globally because we know it's flaky and unstable and we generally never
roll out globally flaky tests so as not to annoy contributors (I'm not
sure why Ubuntu CI should be different from any other CI system we use
upstream). And then, it should be possible to run the test over and over
again somewhere to see what fails updating the list along the way.

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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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