We are seeing a somewhat frequent crash in pa_alsa_path_set_volume in Fedora 18 and 19. See https://retrace.fedoraproject.org/faf/problems/682670/ https://bugzilla.redhat.com/show_bug.cgi?id=970557 I've asked Lennart about this, but he didn't have an immediate idea.
Any chance we could get verbose pulseaudio logs on this one? (log-level = debug in /etc/pulse/daemon.conf and repro the assert). That along with alsa-info would be a good start.
Here is a bug in Launchpad, that looks related, and has a lot of useful data that could be used to track this down, including a user who seems to regularly be able to reproduce. https://bugs.launchpad.net/bugs/1539209
Crash bug, marking as a release blocker.
Possible solution can be found here: https://patchwork.freedesktop.org/patch/153418/ Could you please test?
Georg's patch has been merged, I'll mark this bug as fixed.
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.