diff --git a/releasenotes/notes/account-generator-accepts-positive-numbers-only-33a366a297494ef7.yaml b/releasenotes/notes/account-generator-accepts-positive-numbers-only-33a366a297494ef7.yaml
new file mode 100644
index 0000000..dfee1db
--- /dev/null
+++ b/releasenotes/notes/account-generator-accepts-positive-numbers-only-33a366a297494ef7.yaml
@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+   Concurrency parameter for account-generator command was accepting
+   negative values and zero. The concurrency parameter now accepts only
+   positive numbers. When a negative value or zero is passed to the
+   program then the program ends and help is displayed.
diff --git a/tempest/api/object_storage/test_container_sync.py b/tempest/api/object_storage/test_container_sync.py
index 322579c..bdcb5ae 100644
--- a/tempest/api/object_storage/test_container_sync.py
+++ b/tempest/api/object_storage/test_container_sync.py
@@ -123,7 +123,7 @@
                 self.assertEqual(object_content, obj_name[::-1].encode())
 
     @decorators.attr(type='slow')
-    @decorators.skip_because(bug='1317133')
+    @decorators.unstable_test(bug='1317133')
     @decorators.idempotent_id('be008325-1bba-4925-b7dd-93b58f22ce9b')
     @testtools.skipIf(
         not CONF.object_storage_feature_enabled.container_sync,
diff --git a/tempest/api/volume/base.py b/tempest/api/volume/base.py
index bcbcf43..7af5927 100644
--- a/tempest/api/volume/base.py
+++ b/tempest/api/volume/base.py
@@ -233,12 +233,15 @@
         return group
 
     def delete_group(self, group_id, delete_volumes=True):
-        self.groups_client.delete_group(group_id, delete_volumes)
+        group_vols = []
         if delete_volumes:
             vols = self.volumes_client.list_volumes(detail=True)['volumes']
             for vol in vols:
                 if vol['group_id'] == group_id:
-                    self.volumes_client.wait_for_resource_deletion(vol['id'])
+                    group_vols.append(vol['id'])
+        self.groups_client.delete_group(group_id, delete_volumes)
+        for vol in group_vols:
+            self.volumes_client.wait_for_resource_deletion(vol)
         self.groups_client.wait_for_resource_deletion(group_id)
 
 
diff --git a/tempest/cmd/account_generator.py b/tempest/cmd/account_generator.py
index b230615..ff552a1 100755
--- a/tempest/cmd/account_generator.py
+++ b/tempest/cmd/account_generator.py
@@ -97,6 +97,7 @@
 [OPTIONS] <accounts_file.yaml> -h``.
 """
 
+import argparse
 import os
 import traceback
 
@@ -199,6 +200,14 @@
     LOG.info('%s generated successfully!', account_file)
 
 
+def positive_int(number):
+    number = int(number)
+    if number <= 0:
+        raise argparse.ArgumentTypeError("Concurrency value should be a "
+                                         "positive number")
+    return number
+
+
 def _parser_add_args(parser):
     parser.add_argument('-c', '--config-file',
                         metavar='/etc/tempest.conf',
@@ -228,7 +237,7 @@
                         help='Resources tag')
     parser.add_argument('-r', '--concurrency',
                         default=1,
-                        type=int,
+                        type=positive_int,
                         required=False,
                         dest='concurrency',
                         help='Concurrency count')
diff --git a/tempest/lib/services/compute/servers_client.py b/tempest/lib/services/compute/servers_client.py
index 3ceecda..6723516 100644
--- a/tempest/lib/services/compute/servers_client.py
+++ b/tempest/lib/services/compute/servers_client.py
@@ -206,7 +206,10 @@
     def action(self, server_id, action_name,
                schema=schema.server_actions_common_schema,
                **kwargs):
-        post_body = json.dumps({action_name: kwargs})
+        if 'body' in kwargs:
+            post_body = json.dumps(kwargs['body'])
+        else:
+            post_body = json.dumps({action_name: kwargs})
         resp, body = self.post('servers/%s/action' % server_id,
                                post_body)
         if body:
@@ -608,6 +611,15 @@
         API reference:
         https://docs.openstack.org/api-ref/compute/#unshelve-restore-shelved-server-unshelve-action
         """
+        # NOTE(gmann): pass None as request body if nothing is requested.
+        # Nova started the request body check since 2.77 microversion and only
+        # accept AZ or None as valid req body and reject the empty dict {}.
+        # Before 2.77 microverison anything is valid body as Nova does not
+        # check the request body but as per api-ref None is valid request
+        # body to pass so we do not need to check the requested microversion
+        # here and always default req body to None.
+        if not kwargs:
+            kwargs['body'] = {'unshelve': None}
         return self.action(server_id, 'unshelve', **kwargs)
 
     def shelve_offload_server(self, server_id, **kwargs):
diff --git a/tempest/scenario/test_network_basic_ops.py b/tempest/scenario/test_network_basic_ops.py
index d8584ec..f466729 100644
--- a/tempest/scenario/test_network_basic_ops.py
+++ b/tempest/scenario/test_network_basic_ops.py
@@ -297,9 +297,19 @@
         ip_mask = CONF.network.project_network_mask_bits
         # check if the address is not already in use, if not, set it
         if ' ' + ip_address + '/' + str(ip_mask) not in ip_output:
-            ssh_client.exec_command("sudo ip addr add %s/%s dev %s" % (
-                                    ip_address, ip_mask, new_nic))
-            ssh_client.exec_command("sudo ip link set %s up" % new_nic)
+            try:
+                ssh_client.exec_command("sudo ip addr add %s/%s dev %s" % (
+                                        ip_address, ip_mask, new_nic))
+                ssh_client.exec_command("sudo ip link set %s up" % new_nic)
+            except exceptions.SSHExecCommandFailed as exc:
+                if 'RTNETLINK answers: File exists' in str(exc):
+                    LOG.debug(
+                        'IP address %(ip_address)s is already set in device '
+                        '%(device)s\nPrevious "ip a" output: %(ip_output)s',
+                        {'ip_address': ip_address, 'device': new_nic,
+                         'ip_output': ip_output})
+                else:
+                    raise exc
 
     def _get_server_nics(self, ssh_client):
         reg = re.compile(r'(?P<num>\d+): (?P<nic_name>\w+)[@]?.*:')
diff --git a/tempest/tests/cmd/test_account_generator.py b/tempest/tests/cmd/test_account_generator.py
index d15cd26..7d764be 100644
--- a/tempest/tests/cmd/test_account_generator.py
+++ b/tempest/tests/cmd/test_account_generator.py
@@ -337,3 +337,24 @@
     def setUp(self):
         self.mock_domains()
         super(TestDumpAccountsV3, self).setUp()
+
+
+class TestAccountGeneratorCliCheck(base.TestCase):
+
+    def setUp(self):
+        super(TestAccountGeneratorCliCheck, self).setUp()
+        self.account_generator = account_generator.TempestAccountGenerator(
+            app=mock.Mock(), app_args=mock.Mock())
+        self.parser = self.account_generator.get_parser("generator")
+
+    def test_account_generator_zero_concurrency(self):
+        error = self.assertRaises(
+            SystemExit, lambda: self.parser.parse_args(
+                ['-r', '0', 'accounts_file.yaml']))
+        self.assertTrue(error.code != 0)
+
+    def test_account_generator_negative_concurrency(self):
+        error = self.assertRaises(
+            SystemExit, lambda: self.parser.parse_args(
+                ['-r', '-1', 'accounts_file.yaml']))
+        self.assertTrue(error.code != 0)
diff --git a/tools/generate-tempest-plugins-list.py b/tools/generate-tempest-plugins-list.py
index 5ffef3e..530ce5e 100644
--- a/tools/generate-tempest-plugins-list.py
+++ b/tools/generate-tempest-plugins-list.py
@@ -52,6 +52,8 @@
     'x/tap-as-a-service',  # To avoid sanity-job failure
     'x/valet',  # https://review.opendev.org/#/c/638339/
     'x/kingbird',  # https://bugs.launchpad.net/kingbird/+bug/1869722
+    # vmware-nsx is blacklisted since https://review.opendev.org/#/c/736952
+    'x/vmware-nsx-tempest-plugin',
 ]
 
 url = 'https://review.opendev.org/projects/'
diff --git a/tools/tempest-plugin-sanity.sh b/tools/tempest-plugin-sanity.sh
index 2ff4aea..c983da9 100644
--- a/tools/tempest-plugin-sanity.sh
+++ b/tools/tempest-plugin-sanity.sh
@@ -66,7 +66,7 @@
 # function to create virtualenv to perform sanity operation
 function prepare_workspace {
     SANITY_DIR=$(pwd)
-    virtualenv -p python3 --clear "$SANITY_DIR"/.venv
+    python3 -m venv "$SANITY_DIR"/.venv
     export TVENV="$SANITY_DIR/tools/with_venv.sh"
     cd "$SANITY_DIR"