dbus daemon fails with undefined symbol: XML_SetHashSalt

Issue

• dbus is timing out and processes are failing to connect

  Jan 1 01:00:00 hostname NetworkManager[1534]: <warn>  [546.45] ifcfg-rh: dbus: couldn't initialize system bus: Could not connect: Connection refused
  

• dbus is showing symbol lookup errors

  Traceback (most recent call last):
  File "/usr/bin/firewall-cmd", line 31, in <module>
  from firewall.client import FirewallClient, FirewallClientIPSetSettings, \
  File "/usr/lib/python3.6/site-packages/firewall/client.py", line 28, in <module>
  import dbus.mainloop.glib
  File "/usr/lib64/python3.6/site-packages/dbus/__init__.py", line 101, in <module>
  from dbus._dbus import Bus, SystemBus, SessionBus, StarterBus
  File "/usr/lib64/python3.6/site-packages/dbus/_dbus.py", line 39, in <module>
  from dbus.bus import BusConnection
  File "/usr/lib64/python3.6/site-packages/dbus/bus.py", line 39, in <module>
  from dbus.connection import Connection
  File "/usr/lib64/python3.6/site-packages/dbus/connection.py", line 37, in <module>
  from dbus.proxies import ProxyObject
  File "/usr/lib64/python3.6/site-packages/dbus/proxies.py", line 34, in <module>
  from dbus._expat_introspect_parser import process_introspection_data
  File "/usr/lib64/python3.6/site-packages/dbus/_expat_introspect_parser.py", line 26, in <module>
  from xml.parsers.expat import ParserCreate
  File "/usr/lib64/python3.6/xml/parsers/expat.py", line 4, in <module>
  from pyexpat import *
  ImportError: /usr/lib64/python3.6/lib-dynload/pyexpat.cpython-36m-x86_64-linux-gnu.so: undefined symbol: XML_SetHashSalt
  
  Jan 1 01:00:00 hostname dbus-daemon: /usr/bin/dbus-daemon: symbol lookup error: /usr/bin/dbus-daemon: undefined symbol: XML_SetHashSalt