Created attachment 72663 [details]
pulseaudio extracted from /var/log/messages for the time that pulseaudio ran with log-level=4

About once a day pulseaudio crashes with that message.  The machine is usually idle when this happens except for skype.

$ rpm -qa | grep -i pulse
wine-pulseaudio-1.5.13-1.fc17.x86_64
pulseaudio-module-gconf-1.1-9.fc17.x86_64
pulseaudio-1.1-9.fc17.x86_64
pulseaudio-libs-1.1-9.fc17.i686
wine-pulseaudio-1.5.13-1.fc17.i686
alsa-plugins-pulseaudio-1.0.26-1.fc17.x86_64
kde-settings-pulseaudio-4.8-19.fc17.noarch
gvncpulse-0.5.1-4.fc17.x86_64
pulseaudio-libs-glib2-1.1-9.fc17.x86_64
pulseaudio-module-x11-1.1-9.fc17.x86_64
pulseaudio-module-zeroconf-1.1-9.fc17.x86_64
pulseaudio-libs-1.1-9.fc17.x86_64
pulseaudio-utils-1.1-9.fc17.x86_64


Steps to Reproduce: 
Install skype leave it running
use a USB headset (Logitch G35) as well as speakers on-board sound
run xfce4-mixer and pavucontrol, leave them running

Actual results:
pulseaudio[19858]: [alsa-sink] memblock.c: Assertion 'pa_atomic_load(&(b)->_ref) > 0' failed at pulsecore/memblock.c:590, function pa_memblock_unref(). Aborting.

$ cat ~/.pulse/daemon.conf
log-level = 4
; default-fragment-size-msec = 1
; default-sample-rate = 48000

; log-target = auto
; log-level = notice
; log-meta = no
; log-time = no
; log-backtrace = 0