Nova Hyper-V driver fails occasionally with a x_wmi_uninitialised_thread exception

[Alessandro Pilotti]

The Nova Hyper-V driver can fail occasionally with:

x_wmi_uninitialised_thread ("WMI returned a syntax error: you're probably running inside a thread without first calling pythoncom.CoInitialize[Ex]"

http://64.119.130.115/82904/14/Hyper-V_logs/hv-compute1/neutron-hyperv-agent.log.gz

Each thread that uses COM needs to initialize COM by calling pythoncom.CoInitialize or pythoncom.CoInitializeEx.

Error stack trace:

http://64.119.130.115/82904/14/Hyper-V_logs/hv-compute1/neutron-hyperv-agent.log.gz

[John Garbutt (johngarbutt)]

We use milestones only at the very end of the milestone to track bugs that should block the release of the milestone. Please use tags not milestones to track bugs, try things like: my_bug_topic_milestone_name

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/128136

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/128139

[OpenStack Infra (hudson-openstack)]

Change abandoned by Alessandro Pilotti (<email address hidden>) on branch: master
Review: https://review.openstack.org/128139
Reason: Wrong change Id

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/128140

[OpenStack Infra (hudson-openstack)]

Change abandoned by Alessandro Pilotti (<email address hidden>) on branch: master
Review: https://review.openstack.org/128136

[OpenStack Infra (hudson-openstack)]

Change abandoned by Alessandro Pilotti (<email address hidden>) on branch: master
Review: https://review.openstack.org/128140

[Joe Gordon (jogo)]

patch was abandoned, not sure why though

[Alessandro Pilotti (alexpilotti)]

After some additional tests, since the driver uses green threads, the issue cannot be related to unitialized COM status on the main thread. Cases where this issue appeared proved to be unrelated, so further research in necessary.

[Claudiu Belu (cbelu)]

Marked bug as invalid. The issue has not been observed in ~18 months. Plus, in the meantime, we've given up WMI in favor of PyMI, which is a lot more reliable.