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[Rui Chen <chenrui.momo@xxxxxxxxx>]

Public bug reported:

After restarting nova-compute process, I found that the pci device
assigned to instance in libvirt.xml was different with the record in
'pci_devices' DB table.

Every time nova-compute was restarted, pci_tracker.allocations was reset
to empty dict, it didn't contain the pci devices had been allocated to
instances, so some pci devices would be reallocated to the instances,
and record these pci into DB, maybe they was inconsistent with the
libvirt.xml.

IOW, nova-compute would reallocated the pci device for the instance with
pci request when restarting.

See details:
http://git.openstack.org/cgit/openstack/nova/tree/nova/compute/resource_tracker.py#n347

This is a probabilistic problem, not always can be reproduced. If the
instance have a lot of pci devices, it happen more.

Face this bug in kilo master.

** Affects: nova
     Importance: Undecided
     Assignee: Rui Chen (kiwik-chenrui)
         Status: New


** Tags: compute

** Changed in: nova
     Assignee: (unassigned) => Rui Chen (kiwik-chenrui)

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https://bugs.launchpad.net/bugs/1415768

Title:
  the pci deivce assigned to instance is inconsistent with DB record
  when restarting nova-compute

Status in OpenStack Compute (Nova):
  New

Bug description:
  After restarting nova-compute process, I found that the pci device
  assigned to instance in libvirt.xml was different with the record in
  'pci_devices' DB table.

  Every time nova-compute was restarted, pci_tracker.allocations was
  reset to empty dict, it didn't contain the pci devices had been
  allocated to instances, so some pci devices would be reallocated to
  the instances, and record these pci into DB, maybe they was
  inconsistent with the libvirt.xml.

  IOW, nova-compute would reallocated the pci device for the instance
  with pci request when restarting.

  See details:
  http://git.openstack.org/cgit/openstack/nova/tree/nova/compute/resource_tracker.py#n347

  This is a probabilistic problem, not always can be reproduced. If the
  instance have a lot of pci devices, it happen more.

  Face this bug in kilo master.

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