Arch Linux

After upgrading:

libpulse (9.0-1 -> 9.99.1-1)
pulseaudio (9.0-1 -> 9.99.1-1)
pulseaudio-gconf (9.0-1 -> 9.99.1-1)
pulseaudio-zeroconf (9.0-1 -> 9.99.1-1)

systemd-coredump[799]: Process 720 (pulseaudio) of user 1000 dumped core.
Stack trace of thread 797:
#0 0x00007f1e60e5f04f raise (libc.so.6)
#1 0x00007f1e60e6047a abort (libc.so.6)
#2 0x00007f1e61827794 n/a (libdbus-1.so.3)
#3 0x00007f1e6181e5ac _dbus_warn_check_failed (libdbus-1.so.3)
#4 0x00007f1e61800ffe n/a (libdbus-1.so.3)
#5 0x00007f1e61ca0fc4 pa_dbus_wrap_connection_new (libpulsecommon-9.99.so)
#6 0x00007f1e6218e584 pa_dbus_bus_get (libpulsecore-9.99.so)
#7 0x00007f1e56d3e12f n/a (module-zeroconf-publish.so)
#8 0x00007f1e5692004e n/a (libavahi-client.so.3)
#9 0x00007f1e569207c5 avahi_client_new (libavahi-client.so.3)
#10 0x00007f1e56d3cb98 n/a (module-zeroconf-publish.so)
#11 0x00007f1e61ef0e18 n/a (libpulse.so.0)
#12 0x00007f1e61ef3b7a pa_mainloop_dispatch (libpulse.so.0)
#13 0x00007f1e61ef3d8c pa_mainloop_iterate (libpulse.so.0)
#14 0x00007f1e61ef3e30 pa_mainloop_run (libpulse.so.0)
#15 0x00007f1e61f01e19 n/a (libpulse.so.0)
#16 0x00007f1e61c9ffe8 n/a (libpulsecommon-9.99.so)
#17 0x00007f1e613d5454 start_thread (libpthread.so.0)
#18 0x00007f1e60f147df __clone (libc.so.6)

Stack trace of thread 789:
#0 0x00007f1e60f0b551 ppoll (libc.so.6)
#1 0x00007f1e62156c08 pa_rtpoll_run (libpulsecore-9.99.so)
#2 0x00007f1e585258f3 n/a (libalsa-util.so)
#3 0x00007f1e61c9ffe8 n/a (libpulsecommon-9.99.so)
#4 0x00007f1e613d5454 start_thread (libpthread.so.0)
#5 0x00007f1e60f147df __clone (libc.so.6)

Stack trace of thread 720:
#0 0x00007f1e623e1e87 n/a (n/a)

Or, if instead, running "pulseaudio" directly from the command line:

systemd-coredump[3870]: Process 3865 (pulseaudio) of user 1000 dumped core.
Stack trace of thread 3867:
#0 0x00007f2bf908304f raise (libc.so.6)
#1 0x00007f2bf908447a abort (libc.so.6)
#2 0x00007f2bf9a4b794 n/a (libdbus-1.so.3)
#3 0x00007f2bf9a425ac _dbus_warn_check_failed (libdbus-1.so.3)
#4 0x00007f2bf9a24ffe n/a (libdbus-1.so.3)
#5 0x00007f2bf9ec4fc4 pa_dbus_wrap_connection_new (libpulsecommon-9.99.so)
#6 0x00007f2bfa3b2584 pa_dbus_bus_get (libpulsecore-9.99.so)
#7 0x00007f2beef6212f n/a (module-zeroconf-publish.so)
#8 0x00007f2beeb4404e n/a (libavahi-client.so.3)
#9 0x00007f2beeb447c5 avahi_client_new (libavahi-client.so.3)
#10 0x00007f2beef60b98 n/a (module-zeroconf-publish.so)
#11 0x00007f2bfa114e18 n/a (libpulse.so.0)
#12 0x00007f2bfa117b7a pa_mainloop_dispatch (libpulse.so.0)
#13 0x00007f2bfa117d8c pa_mainloop_iterate (libpulse.so.0)
#14 0x00007f2bfa117e30 pa_mainloop_run (libpulse.so.0)
#15 0x00007f2bfa125e19 n/a (libpulse.so.0)
#16 0x00007f2bf9ec3fe8 n/a (libpulsecommon-9.99.so)
#17 0x00007f2bf95f9454 start_thread (libpthread.so.0)
#18 0x00007f2bf91387df __clone (libc.so.6)

Stack trace of thread 3865:
#0 0x00007f2bf96021cd read (libpthread.so.0)
#1 0x00007f2bf9e94f51 pa_read (libpulsecommon-9.99.so)
#2 0x00007f2bedb28271 n/a (module-gconf.so)
#3 0x00007f2bedb2840f n/a (module-gconf.so)
#4 0x00007f2bedb28a1d module_gconf_LTX_pa__init (module-gconf.so)
#5 0x00007f2bfa371598 pa_module_load (libpulsecore-9.99.so)
#6 0x00007f2bfa360881 n/a (libpulsecore-9.99.so)
#7 0x00007f2bfa366c1c pa_cli_command_execute_line_stateful (libpulsecore-9.99.so)
#8 0x00007f2bfa367431 pa_cli_command_execute_file_stream (libpulsecore-9.99.so)
#9 0x000000000040743c main (pulseaudio)
#10 0x00007f2bf9070291 __libc_start_main (libc.so.6)
#11 0x0000000000407c1a _start (pulseaudio)

Stack trace of thread 3866:
#0 0x00007f2bf912f551 ppoll (libc.so.6)
#1 0x00007f2bfa37ac08 pa_rtpoll_run (libpulsecore-9.99.so)
#2 0x00007f2bf07498f3 n/a (libalsa-util.so)
#3 0x00007f2bf9ec3fe8 n/a (libpulsecommon-9.99.so)
#4 0x00007f2bf95f9454 start_thread (libpthread.so.0)
#5 0x00007f2bf91387df __clone (libc.so.6)