Revert "Don't try to lock for vif detach"

This is causing more serious issues, as there is a race
between tenant VIF removal and cleaning VIF adding.

This reverts commit 4f79cb3932.

The release note is not deleted from it, because the change has
already been released. A new one is added instead.

Change-Id: I922f24293645ff6bb79ad753f49dc9548b9f2485
Closes-Bug: #1750785

ironic/conductor/manager.py

@@ -2951,12 +2951,7 @@ class ConductorManager(base_manager.BaseConductorManager):
         """
         LOG.debug("RPC vif_detach called for the node %(node_id)s with "
                   "vif_id %(vif_id)s", {'node_id': node_id, 'vif_id': vif_id})
-        # NOTE(TheJulia): This task is explicitly called without a lock as
-        # long lived locks occur during node tear-down as a node goes into
-        # cleaning. The lack of a lock allows nova to remove the VIF record.
-        # See: https://bugs.launchpad.net/ironic/+bug/1743652
         with task_manager.acquire(context, node_id,
-                                  shared=True,
                                   purpose='detach vif') as task:
             task.driver.network.validate(task)
             task.driver.network.vif_detach(task, vif_id)

ironic/drivers/base.py

@@ -1042,10 +1042,6 @@ class NetworkInterface(BaseInterface):
     def vif_detach(self, task, vif_id):
         """Detach a virtual network interface from a node
 
-        Warning: This method is called by the conductor as a shared
-        task, to ensure that a vif can be detached during a long-lived lock.
-        Such as those that occur when a node is being unprovisioned.
-
         :param task: A TaskManager instance.
         :param vif_id: A VIF ID to detach
         :raises: NetworkError, VifNotAttached

ironic/drivers/modules/network/common.py

@@ -581,8 +581,8 @@ class NeutronVIFPortIDMixin(VIFPortIDMixin):
         # attached, and fail if not.
         port_like_obj = self._get_port_like_obj_by_vif_id(task, vif_id)
 
+        self._clear_vif_from_port_like_obj(port_like_obj)
+
         # NOTE(vsaienko) allow to unplug VIFs from ACTIVE instance.
         if task.node.provision_state == states.ACTIVE:
             neutron.unbind_neutron_port(vif_id, context=task.context)
-
-        self._clear_vif_from_port_like_obj(port_like_obj)

ironic/tests/unit/conductor/test_manager.py

@@ -36,7 +36,6 @@ from ironic.common import boot_devices
 from ironic.common import driver_factory
 from ironic.common import exception
 from ironic.common import images
-from ironic.common import neutron
 from ironic.common import states
 from ironic.common import swift
 from ironic.conductor import manager
@@ -4481,17 +4480,17 @@ class VifTestCase(mgr_utils.ServiceSetUpMixin, db_base.DbTestCase):
         mock_detach.assert_called_once_with(mock.ANY, "interface")
         mock_valid.assert_called_once_with(mock.ANY, mock.ANY)
 
-    @mock.patch.object(neutron, 'unbind_neutron_port', autpspec=True)
+    @mock.patch.object(n_flat.FlatNetwork, 'vif_detach', autpspec=True)
-    def test_vif_detach_node_is_locked(self, mock_detach, mock_valid):
+    def test_vif_detach_node_locked(self, mock_detach, mock_valid):
         node = obj_utils.create_test_node(self.context, driver='fake',
                                           reservation='fake-reserv')
-        obj_utils.create_test_port(self.context,
+        exc = self.assertRaises(messaging.rpc.ExpectedException,
-                                   node_id=node.id,
+                                self.service.vif_detach,
-                                   internal_info={
+                                self.context, node.uuid, "interface")
-                                       'tenant_vif_port_id': 'fake-id'})
+        # Compare true exception hidden by @messaging.expected_exceptions
-        self.service.vif_detach(self.context, node.uuid, 'fake-id')
+        self.assertEqual(exception.NodeLocked, exc.exc_info[0])
         self.assertFalse(mock_detach.called)
-        self.assertTrue(mock_valid.called)
+        self.assertFalse(mock_valid.called)
 
     @mock.patch.object(n_flat.FlatNetwork, 'vif_detach', autpspec=True)
     def test_vif_detach_raises_network_error(self, mock_detach,

ironic/tests/unit/drivers/modules/network/test_common.py

@@ -941,28 +941,12 @@ class TestNeutronVifPortIDMixin(db_base.DbTestCase):
         self.node.save()
         mock_get.return_value = self.port
         mock_unp.side_effect = exception.NetworkError
-        with task_manager.acquire(self.context, self.node.id,
+        with task_manager.acquire(self.context, self.node.id) as task:
-                                  shared=True) as task:
             self.assertRaises(exception.NetworkError,
                               self.interface.vif_detach, task, 'fake_vif_id')
             mock_unp.assert_called_once_with('fake_vif_id',
                                              context=task.context)
         mock_get.assert_called_once_with(task, 'fake_vif_id')
-        mock_clear.assert_not_called()
-
-    @mock.patch.object(common.VIFPortIDMixin, '_clear_vif_from_port_like_obj')
-    @mock.patch.object(neutron_common, 'unbind_neutron_port', autospec=True)
-    @mock.patch.object(common.VIFPortIDMixin, '_get_port_like_obj_by_vif_id')
-    def test_vif_detach_deleting_node_success(self, mock_get, mock_unp,
-                                              mock_clear):
-        self.node.provision_state = states.DELETING
-        self.node.save()
-        mock_get.return_value = self.port
-        with task_manager.acquire(self.context, self.node.id,
-                                  shared=True) as task:
-            self.interface.vif_detach(task, 'fake_vif_id')
-        self.assertFalse(mock_unp.called)
-        mock_get.assert_called_once_with(task, 'fake_vif_id')
         mock_clear.assert_called_once_with(self.port)
 
     @mock.patch.object(common_utils, 'warn_about_deprecated_extra_vif_port_id',

releasenotes/notes/vif-detach-locking-fix-revert-3961d47fe419460a.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Reverts the fix for orphaned VIF records from the previous release, as
+    it causes a regression. See `bug 1750785
+    <https://bugs.launchpad.net/ironic/+bug/1750785>`_ for details.