Seems like a timeout is hit (tested with 15 sec timeout) when executing various dump apis (memif dump, interface dump, vhost user dump and sw_interface_rx_placement_dump):

18:54:36.179 DEBUG Reusing SSH: <paramiko.client.SSHClient object at 0xffff2ce4e5d0>
18:54:36.183 DEBUG [chan 17] Max packet in: 32768 bytes
18:54:36.188 TRACE exec_command on ('10.30.51.37', 22) with timeout 600: sudo -S chmod o+rwx /run/vpp-api.sock
18:54:36.291 TRACE exec_command on ('10.30.51.37', 22) took 0.102872133255 seconds
18:54:36.291 TRACE return RC 0
18:54:36.292 TRACE return STDOUT
18:54:36.292 TRACE return STDERR
18:54:52.070 WARN Reconnect after error: VPPIOError(2, 'VPP API client: read failed')
18:55:07.090 ERROR [Errno 111] Connection refused on socket /tmp/tmpmjgaUI/vpp-api.sock
18:55:07.091 INFO Excepted: error(111, 'Connection refused')
Raising: AssertionError('Failed to get interface dump on host 10.30.51.37',)
18:55:07.462 FAIL Failed to get interface dump on host 10.30.51.37
18:55:07.464 DEBUG Traceback (most recent call last):
File "/csit/resources/libraries/python/InterfaceUtil.py", line 698, in update_all_interface_data_on_all_nodes
InterfaceUtil.update_vpp_interface_data_on_node(node_data)
File "/csit/resources/libraries/python/InterfaceUtil.py", line 522, in update_vpp_interface_data_on_node
interface_list = InterfaceUtil.vpp_get_interface_data(node)
File "/csit/resources/libraries/python/InterfaceUtil.py", line 325, in vpp_get_interface_data
details = papi_exec.add(cmd, **args).get_details(err_msg)
File "/csit/resources/libraries/python/PapiExecutor.py", line 401, in get_details
return self._execute(err_msg)
File "/csit/resources/libraries/python/PapiExecutor.py", line 484, in _execute
raise_from(AssertionError(err_msg), err, level="INFO")
File "/csit/resources/libraries/python/PythonThree.py", line 39, in raise_from
raise raising