Description of problem:

$ pulseaudio -h
...
process 18532: dbus_shutdown() called but connections were still live. This
probably means the application did not drop all its references to bus connections.
  D-Bus not built with -rdynamic so unable to print a backtrace
Aborted (core dumped)
$

This also happens when pulse-audio daemon is being shut down in any way (both
server and the client that does "pulseaudio -k" do die this way).