Comment 42 for bug 367379

If you don't want to disable pulseaudio, I found an alternate workaround:

In CIV4 at least, simply editing /etc/pulse/client.conf and setting "disable-shm = yes" instead of "disable-shm = no" eliminates crashing.

then run:
$ killall pulseaudio && start-pulseaudio-x11
or reboot to activate the changes.