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[Vijay Ladani <vijay.ladani@xxxxxxx>]

Moving this bug to Nova team since n-cpu.log reports error.
Also, detach request does not reach to cinder. 

** Project changed: cinder => nova

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https://bugs.launchpad.net/bugs/1657718

Title:
  LVM : Volume detach failed after rebuilding instance to different nova
  image.

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  Pre-requisites:
  1) LVM backend must be configured and enabled.
  2) Volume type LVM must be created beforehand.
  3) More than one image must be present in Openstack host.

  Steps to Reproduce:
   1. Navigate to Devstack Host CLI.
   2. Run the command to create a bootable volume <volume1>:
      $cinder create --image <image> --name <name> --volume-type <volume-type> <size>
   3. Create a volume <volume2> without selecting volume source.
      $cinder create --name <volume_name> --volume-type <volume-type> <size>
   4. Launch an instance booting from volume1.
      $nova boot --flavor <flavor> --boot-volume <volume_id> <name>
   5. Attach the volume2 to an instance.
      $nova volume-attach <server> <volume> [<device>]
   6. Rebuild the instance with different image.
      $nova rebuild <server> <image>
   7. Detach volume2 from instance.
      $nova volume-detach <server> <volume2>

  Expected Result:
   1. Volume2 should be detached.

  Observed Results:
   1. Volume detach failed.

  Additional Details:
  1) This scenario was performed on Devstack (Newton) setup. 
  3) n-cpu logs are attached

  
  n-cpu Traces:

  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall Traceback (most recent call last):
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall   File "/usr/local/lib/python2.7/dist-packages/oslo_service/loopingcall.py", line 136, in _run_loop
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall     result = func(*self.args, **self.kw)
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall   File "/usr/local/lib/python2.7/dist-packages/oslo_service/loopingcall.py", line 377, in _func
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall     return self._sleep_time
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall     self.force_reraise()
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall     six.reraise(self.type_, self.value, self.tb)
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall   File "/usr/local/lib/python2.7/dist-packages/oslo_service/loopingcall.py", line 356, in _func
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall     result = f(*args, **kwargs)
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall   File "/opt/stack/nova/nova/virt/libvirt/guest.py", line 394, in _do_wait_and_retry_detach
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall     reason=reason)
  2017-01-19 03:10:56.006 TRACE oslo.service.loopingcall DeviceDetachFailed: Device detach failed for vdb: Unable to detach from guest transient domain.

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