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[Launchpad Bug Tracker <1662869@xxxxxxxxxxxxxxxxxx>]

[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

** Changed in: nova
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1662869

Title:
  Multiple attempts to detach and disconnect volumes during rebuild

Status in OpenStack Compute (nova):
  Expired

Bug description:
  Description
  ===========
  The following was noticed during a CI run for https://review.openstack.org/#/c/383859/ :

  http://logs.openstack.org/09/395709/7/check/gate-tempest-dsvm-full-
  devstack-plugin-nfs-
  nv/a4c1057/logs/screen-n-cpu.txt.gz?level=ERROR#_2017-02-07_19_17_41_994

  This is due to rebuild calling for two separate detach/disconnects of
  a volume when using the libvirt virt driver, once in
  _rebuild_default_impl in the compute layer and a second time in
  cleanup within the virt driver :

  https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L2653 - _rebuild_default_impl
  https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L989 - cleanup

  In the logs req-e976fee4-51df-4119-b505-5d68f4583186 tracks the
  rebuild attempt. We see the first attempt to umount succeed here :

  http://logs.openstack.org/09/395709/7/check/gate-tempest-dsvm-full-
  devstack-plugin-nfs-
  nv/a4c1057/logs/screen-n-cpu.txt.gz?level=ALL#_2017-02-07_19_17_39_904

  We then see the second attempt here and again an ERROR is logged as we
  don't find the mount to be in use :

  http://logs.openstack.org/09/395709/7/check/gate-tempest-dsvm-full-
  devstack-plugin-nfs-
  nv/a4c1057/logs/screen-n-cpu.txt.gz?level=ALL#_2017-02-07_19_17_41_993

  Steps to reproduce
  ==================
  Rebuild an instance with volumes attached

  Expected result
  ===============
  Only one attempt is made to detach and disconnect each volume from the original instance.

  Actual result
  =============
  Two attempts are made to detach and disconnect each volume from the original instance.

  Environment
  ===========
  1. Exact version of OpenStack you are running. See the following
    list for all releases: http://docs.openstack.org/releases/

     https://review.openstack.org/#/c/383859/ - but it should reproduce
  against master.

  2. Which hypervisor did you use?
     (For example: Libvirt + KVM, Libvirt + XEN, Hyper-V, PowerKVM, ...)
     What's the version of that?

     Libvirt

  2. Which storage type did you use?
     (For example: Ceph, LVM, GPFS, ...)
     What's the version of that?

     n/a

  3. Which networking type did you use?
     (For example: nova-network, Neutron with OpenVSwitch, ...)

     n/a

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