[Bug 1374508] Re: Mismatch happens between BDM and domain XML If instance does not respond to ACPI hotplug during detach/attach.

[Hua Zhang]

** Also affects: nova (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1374508

Title:
  Mismatch happens between BDM and domain XML If instance does not
  respond to ACPI hotplug during detach/attach.

Status in OpenStack Compute (nova):
  Fix Released
Status in nova package in Ubuntu:
  New
Status in nova source package in Trusty:
  New

Bug description:
  tempest.api.compute.servers.test_server_rescue_negative:ServerRescueNegativeTestJSON.test_rescued_vm_detach_volume

  This test passes however it fails to properly cleanup after itself -
  the detach completes but without running the necessary iscsiadm
  commands.

  In nova.virt.libvirt.volume.LibvirtISCSIVolumeDriver.disconnect_volume
  the list returned by self.connection._get_all_block_devices includes
  the host_device which means that self._disconnect_from_iscsi_portal is
  never run.

  
  You can see evidence of this in /etc/iscsi/nodes as well as errors logged in /var/log/syslog

  I'm guessing there is a race between the unrescue and the detach
  within libvirt. In
  nova.virt.libvirt.driver.LibvirtDriver.detach_volume if I put in a
  sleep before virt_dom.detachDeviceFlags(xml, flags) the detach appears
  to work properly however if I sleep after that line it does not appear
  to have any effect.

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