I see this in the cinder volume logs:

http://logs.openstack.org/17/117417/11/gate/gate-tempest-dsvm-neutron-pg-full/c3fe760/logs/screen-c-vol.txt.gz#_2014-11-26_14_16_03_152

2014-11-26 14:16:03.152 1390 WARNING cinder.brick.iscsi.iscsi [req-1c2046a2-0e5a-4a9c-9d11-b1f8f4a62e3d 233bb4a2bf5a463eb92255fda6d45011 92d6d94d6d384ea984ec2f838413a396 - - -] Failed to create iscsi target for volume id:volume-c1dfc318-a139-45a3-b235-f35d1b1fb9d0: Unexpected error while running command.
Command: None
Exit code: -
Stdout: u"Unexpected error while running command.\nCommand: sudo cinder-rootwrap /etc/cinder/rootwrap.conf tgt-admin --update iqn.2010-10.org.openstack:volume-c1dfc318-a139-45a3-b235-f35d1b1fb9d0\nExit code: 22\nStdout: u'Command:\\n\\ttgtadm -C 0 --lld iscsi --op new --mode target --tid 1 -T iqn.2010-10.org.openstack:volume-c1dfc318-a139-45a3-b235-f35d1b1fb9d0\\nexited with code: 22.\\n'\nStderr: u'tgtadm: this target already exists\\n'"
Stderr: None
2014-11-26 14:16:03.153 1390 ERROR oslo.messaging.rpc.dispatcher [req-1c2046a2-0e5a-4a9c-9d11-b1f8f4a62e3d 233bb4a2bf5a463eb92255fda6d45011 92d6d94d6d384ea984ec2f838413a396 - - -] Exception during message handling: Failed to create iscsi target for volume volume-c1dfc318-a139-45a3-b235-f35d1b1fb9d0.
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 134, in _dispatch_and_reply
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 177, in _dispatch
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 123, in _do_dispatch
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/osprofiler/profiler.py", line 105, in wrapper
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher     return f(*args, **kwargs)
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/new/cinder/cinder/volume/manager.py", line 898, in initialize_connection
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher     volume)
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/osprofiler/profiler.py", line 105, in wrapper
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher     return f(*args, **kwargs)
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/new/cinder/cinder/volume/drivers/lvm.py", line 549, in create_export
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher     return self._create_export(context, volume)
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/new/cinder/cinder/volume/drivers/lvm.py", line 561, in _create_export
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher     self.configuration)
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/new/cinder/cinder/volume/iscsi.py", line 62, in create_export
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher     conf.iscsi_write_cache)
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/new/cinder/cinder/brick/iscsi/iscsi.py", line 252, in create_iscsi_target
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher     raise exception.ISCSITargetCreateFailed(volume_id=vol_id)
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher ISCSITargetCreateFailed: Failed to create iscsi target for volume volume-c1dfc318-a139-45a3-b235-f35d1b1fb9d0.
2014-11-26 14:16:03.153 1390 TRACE oslo.messaging.rpc.dispatcher