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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Yup the problem is right here, and it's been around since 2014:

https://github.com/openstack/nova/blob/16.0.0/nova/objects/block_device.py#L291

The regression that hits it is this:

https://review.openstack.org/#/c/429476/

Before that, that code didn't lazy-load bdm.instance and hit that code.
And it would only fail if you're running nova-api with debug logging
enabled (which isn't uncommon really).

Apparently we aren't hitting this in CI - probably because we don't gate
on the NFS job.

** Tags added: api

** Changed in: nova
       Status: New => Triaged

** Changed in: nova
     Assignee: (unassigned) => Matt Riedemann (mriedem)

** Changed in: nova
   Importance: Undecided => High

** Also affects: nova/pike
   Importance: Undecided
       Status: New

** Changed in: nova/pike
       Status: New => Confirmed

** Changed in: nova/pike
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1726871

Title:
  AttributeError: 'BlockDeviceMapping' object has no attribute 'uuid'

Status in OpenStack Compute (nova):
  Triaged
Status in OpenStack Compute (nova) pike series:
  Confirmed

Bug description:
  running Pike, Cinder is configured with disabled NAS security and
  enabled snapshots in NFS driver.

  While trying to make a snapshot nova-api reports:

  2017-10-24 13:36:16.558 39 INFO nova.osapi_compute.wsgi.server [req-e6c3dec2-40ea-4858-af91-3d77395d6978 6f4347f3c1b34d69946b17592aaf5b7f aeb3218c5fdc4d58b1094a4d360a2a96 - default default] 10.196.245.222,10.196.245.203 "GET /v2.1/ HTTP/1.1" status: 200 len: 763 time: 0.0097859
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions [req-cb2a54c0-6103-41ca-a5dc-587e301bfbb1 6f4347f3c1b34d69946b17592aaf5b7f aeb3218c5fdc4d58b1094a4d360a2a96 - default default] Unexpected exception in API method: AttributeError: 'BlockDeviceMapping' object has no attribute 'uuid'
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions Traceback (most recent call last):
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/api/openstack/extensions.py", line 336, in wrapped
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions     return f(*args, **kwargs)
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/api/openstack/compute/assisted_volume_snapshots.py", line 52, in create
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions     create_info)
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/compute/api.py", line 4165, in volume_snapshot_create
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions     return do_volume_snapshot_create(self, context, bdm.instance)
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 67, in getter
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions     self.obj_load_attr(name)
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/objects/block_device.py", line 288, in obj_load_attr
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions     'uuid': self.uuid,
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions AttributeError: 'BlockDeviceMapping' object has no attribute 'uuid'
  2017-10-24 13:36:17.315 39 ERROR nova.api.openstack.extensions 
  2017-10-24 13:36:17.317 39 INFO nova.api.openstack.wsgi [req-cb2a54c0-6103-41ca-a5dc-587e301bfbb1 6f4347f3c1b34d69946b17592aaf5b7f aeb3218c5fdc4d58b1094a4d360a2a96 - default default] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  <type 'exceptions.AttributeError'>

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