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[Launchpad Bug Tracker <1657718@xxxxxxxxxxxxxxxxxx>]

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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.

** Affects: nova
     Importance: Undecided
         Status: New

-- 
LVM : Volume detach failed after rebuilding instance to different nova image.
https://bugs.launchpad.net/bugs/1657718
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