Comment 81 for bug 1040873

 >>j ust a small update:
 I removed [Mapping analog-surround-21] sections in /usr/share/pulseaudio/alsa-mixer
 /profile-sets/default.conf and extra-hdmi.conf

At least pulseaudio can start.
 So the [Mapping analog-surround-21] sections make pulseaudio crash...

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/daemon/daemon-conf.c

can you provide verbose log by changing log_level in /etc/pulse/daemon.conf

log_level = debug