Comment 16 for bug 1788006

Here are the state changes I'm seeing in that failure log while n-cpu is waiting for the network-vif-plugged event and after it's plugged the vif on the host:

Aug 20 12:52:06.006477 ubuntu-xenial-ovh-gra1-0001411231 nova-compute[27062]: DEBUG nova.virt.driver [-] Emitting event <LifecycleEvent: 1534769526.01, 9797a641-8925-4f74-abbf-c6111d47f91d => Started> {{(pid=27062) emit_event /opt/stack/nova/nova/virt/driver.py:1545}}
Aug 20 12:52:06.006973 ubuntu-xenial-ovh-gra1-0001411231 nova-compute[27062]: INFO nova.compute.manager [-] [instance: 9797a641-8925-4f74-abbf-c6111d47f91d] VM Started (Lifecycle Event)

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Aug 20 12:52:06.065415 ubuntu-xenial-ovh-gra1-0001411231 nova-compute[27062]: DEBUG nova.virt.driver [None req-27237dca-57e7-488d-aa47-f8f53ad60fc9 None None] Emitting event <LifecycleEvent: 1534769526.01, 9797a641-8925-4f74-abbf-c6111d47f91d => Paused> {{(pid=27062) emit_event /opt/stack/nova/nova/virt/driver.py:1545}}
Aug 20 12:52:06.065642 ubuntu-xenial-ovh-gra1-0001411231 nova-compute[27062]: INFO nova.compute.manager [None req-27237dca-57e7-488d-aa47-f8f53ad60fc9 None None] [instance: 9797a641-8925-4f74-abbf-c6111d47f91d] VM Paused (Lifecycle Event)

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Aug 20 12:52:07.636565 ubuntu-xenial-ovh-gra1-0001411231 nova-compute[27062]: DEBUG nova.virt.driver [None req-27237dca-57e7-488d-aa47-f8f53ad60fc9 None None] Emitting event <LifecycleEvent: 1534769527.63, 9797a641-8925-4f74-abbf-c6111d47f91d => Resumed> {{(pid=27062) emit_event /opt/stack/nova/nova/virt/driver.py:1545}}
Aug 20 12:52:07.636911 ubuntu-xenial-ovh-gra1-0001411231 nova-compute[27062]: INFO nova.compute.manager [None req-27237dca-57e7-488d-aa47-f8f53ad60fc9 None None] [instance: 9797a641-8925-4f74-abbf-c6111d47f91d] VM Resumed (Lifecycle Event)

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Aug 20 12:52:07.680184 ubuntu-xenial-ovh-gra1-0001411231 nova-compute[27062]: DEBUG nova.virt.driver [None req-27237dca-57e7-488d-aa47-f8f53ad60fc9 None None] Emitting event <LifecycleEvent: 1534769527.64, 9797a641-8925-4f74-abbf-c6111d47f91d => Resumed> {{(pid=27062) emit_event /opt/stack/nova/nova/virt/driver.py:1545}}
Aug 20 12:52:07.680790 ubuntu-xenial-ovh-gra1-0001411231 nova-compute[27062]: INFO nova.compute.manager [None req-27237dca-57e7-488d-aa47-f8f53ad60fc9 None None] [instance: 9797a641-8925-4f74-abbf-c6111d47f91d] VM Resumed (Lifecycle Event)

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Aug 20 12:52:07.721266 ubuntu-xenial-ovh-gra1-0001411231 nova-compute[27062]: DEBUG nova.virt.driver [None req-27237dca-57e7-488d-aa47-f8f53ad60fc9 None None] Emitting event <LifecycleEvent: 1534769527.64, 9797a641-8925-4f74-abbf-c6111d47f91d => Paused> {{(pid=27062) emit_event /opt/stack/nova/nova/virt/driver.py:1545}}
Aug 20 12:52:07.721592 ubuntu-xenial-ovh-gra1-0001411231 nova-compute[27062]: INFO nova.compute.manager [None req-27237dca-57e7-488d-aa47-f8f53ad60fc9 None None] [instance: 9797a641-8925-4f74-abbf-c6111d47f91d] VM Paused (Lifecycle Event)

And then that's it. So it looks like we go from resumed (running) back to paused in the guest and then never get back to running.