diff --git a/neutron/manager.py b/neutron/manager.py
index a2f22b16fa5..51c9bf5cf48 100644
--- a/neutron/manager.py
+++ b/neutron/manager.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import sys
 import weakref
 
 from oslo_config import cfg
@@ -136,19 +137,22 @@ class NeutronManager(object):
     @staticmethod
     def load_class_for_provider(namespace, plugin_provider):
         if not plugin_provider:
-            LOG.exception(_LE("Error, plugin is not set"))
+            LOG.error(_LE("Error, plugin is not set"))
             raise ImportError(_("Plugin not found."))
         try:
             # Try to resolve plugin by name
             mgr = driver.DriverManager(namespace, plugin_provider)
             plugin_class = mgr.driver
-        except RuntimeError as e1:
+        except RuntimeError:
+            e1_info = sys.exc_info()
             # fallback to class name
             try:
                 plugin_class = importutils.import_class(plugin_provider)
-            except ImportError as e2:
-                LOG.exception(_LE("Error loading plugin by name, %s"), e1)
-                LOG.exception(_LE("Error loading plugin by class, %s"), e2)
+            except ImportError:
+                LOG.error(_LE("Error loading plugin by name"),
+                          exc_info=e1_info)
+                LOG.error(_LE("Error loading plugin by class"),
+                          exc_info=True)
                 raise ImportError(_("Plugin not found."))
         return plugin_class
 
diff --git a/neutron/policy.py b/neutron/policy.py
index 08a7e293d2b..660971c76d9 100644
--- a/neutron/policy.py
+++ b/neutron/policy.py
@@ -226,7 +226,7 @@ class OwnerCheck(policy.Check):
                 # If we are here split failed with both separators
                 err_reason = (_("Unable to find resource name in %s") %
                               self.target_field)
-                LOG.exception(err_reason)
+                LOG.error(err_reason)
                 raise exceptions.PolicyCheckError(
                     policy="%s:%s" % (self.kind, self.match),
                     reason=err_reason)
@@ -236,7 +236,7 @@ class OwnerCheck(policy.Check):
                 err_reason = (_("Unable to verify match:%(match)s as the "
                                 "parent resource: %(res)s was not found") %
                               {'match': self.match, 'res': parent_res})
-                LOG.exception(err_reason)
+                LOG.error(err_reason)
                 raise exceptions.PolicyCheckError(
                     policy="%s:%s" % (self.kind, self.match),
                     reason=err_reason)
diff --git a/neutron/services/provider_configuration.py b/neutron/services/provider_configuration.py
index 9f8981be823..c2837855a30 100644
--- a/neutron/services/provider_configuration.py
+++ b/neutron/services/provider_configuration.py
@@ -197,7 +197,7 @@ class ProviderConfiguration(object):
             if v['driver'] == driver:
                 msg = (_("Driver %s is not unique across providers") %
                        driver)
-                LOG.exception(msg)
+                LOG.error(msg)
                 raise n_exc.Invalid(msg)
 
     def _ensure_default_unique(self, type, default):
@@ -207,7 +207,7 @@ class ProviderConfiguration(object):
             if k[0] == type and v['default']:
                 msg = _("Multiple default providers "
                         "for service %s") % type
-                LOG.exception(msg)
+                LOG.error(msg)
                 raise n_exc.Invalid(msg)
 
     def add_provider(self, provider):
diff --git a/neutron/tests/unit/db/test_migration.py b/neutron/tests/unit/db/test_migration.py
index 3c149ea87ce..dda1cbce28e 100644
--- a/neutron/tests/unit/db/test_migration.py
+++ b/neutron/tests/unit/db/test_migration.py
@@ -341,7 +341,7 @@ class TestCli(base.BaseTestCase):
                 mock.patch.object(cli, '_use_separate_migration_branches',
                                   return_value=not branchless):
             fc.return_value.get_heads.return_value = heads
-            with mock.patch('six.moves.builtins.open') as mock_open:
+            with mock.patch.object(cli, 'open') as mock_open:
                 mock_open.return_value.__enter__ = lambda s: s
                 mock_open.return_value.__exit__ = mock.Mock()
                 mock_open.return_value.read.return_value = (