Hi,
Sorry I applied the patch 3, and I still got the error : 


2019-02-15 15:45:09.504 25609 ERROR oslo_service.service [req-3ac88fdc-134d-4931-9b2b-942e76618dae - - - - -] Error starting thread.: sqlalchemy.orm.exc.DetachedInstanceError: Parent instance <VolumeAttachment at 0x7f3efbd77320> is not bound to a Session; lazy load operation of attribute 'volume' cannot proceed (Background on this error at: http://sqlalche.me/e/bhk3)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service Traceback (most recent call last):
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/oslo_service/service.py", line 796, in run_service
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     service.start()
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/cinder/service.py", line 222, in start
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     service_id=Service.service_id)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/cinder/volume/manager.py", line 447, in init_host
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     volumes = self._get_my_volumes(ctxt)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/cinder/volume/manager.py", line 2910, in _get_my_volumes
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     return self._get_my_resources(ctxt, objects.VolumeList)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/cinder/volume/manager.py", line 2907, in _get_my_resources
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     return getattr(ovo_class_list, 'get_all')(ctxt, filters=filters)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/cinder/objects/volume.py", line 617, in get_all
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     volumes, expected_attrs=expected_attrs)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/oslo_versionedobjects/base.py", line 1133, in obj_make_list
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     **extra_args)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/cinder/objects/volume.py", line 290, in _from_db_object
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     db_volume.get('volume_attachment'))
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/oslo_versionedobjects/base.py", line 1133, in obj_make_list
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     **extra_args)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/cinder/objects/volume_attachment.py", line 98, in _from_db_object
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     if 'volume' in expected_attrs and hasattr(db_attachment, 'volume'):
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/sqlalchemy/orm/attributes.py", line 242, in __get__
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     return self.impl.get(instance_state(instance), dict_)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/sqlalchemy/orm/attributes.py", line 599, in get
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     value = self.callable_(state, passive)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service   File "/usr/lib/python3/dist-packages/sqlalchemy/orm/strategies.py", line 596, in _load_for_state
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service     (orm_util.state_str(state), self.key)
2019-02-15 15:45:09.504 25609 ERROR oslo_service.service sqlalchemy.orm.exc.DetachedInstanceError: Parent instance <VolumeAttachment at 0x7f3efbd77320> is not bound to a Session; lazy load operation of attribute 'volume' cannot proceed (Background on this error at: http://sqlalche.me/e/bhk3)