Hi,
I just wanted to add that I'd been having this issue too and rolling
back libasound2 altogether, not just the plugins packages was
required. With the plugins packages rolled back I stopped having
segv's but the bigger issue was that nothing in a dbus session could
see the changes; alsa could see all devices yet pulseaudio was unable
to find or connect to anything but a secondary usb interface, indeed
it seemed to be trying to open non-existent devices under /dev/snd/. I
also rolled back the kernel upgrade just in case and rebooted and took
care to check with alsactl init and store. Only then did I recover
access to my internal sound card. I'm also wondering whether a recent
udisks2 upgrade may have also contributed, but it's very difficult to
pin down where exactly the breakdown is, I don't think it's pulseaudio
itself, it's what it depends on.
