OK, I have googled & I still have no good idea how to help. I do have
this however:

0x00007f9475fb22e9 in pthread_cond_wait@@GLIBC_2.3.2 () from 
/lib/libpthread.so.0
(gdb) bt
#0  0x00007f9475fb22e9 in pthread_cond_wait@@GLIBC_2.3.2 () from 
/lib/libpthread.so.0
#1  0x00007f94770d313e in gst_task_join () from /usr/lib/libgstreamer-0.10.so.0
#2  0x00007f946ed6458e in ?? () from /usr/lib/gstreamer-0.10/libgstalsa.so
#3  0x00007f946ed6563e in ?? () from /usr/lib/gstreamer-0.10/libgstalsa.so
#4  0x00007f947709a1cc in gst_element_change_state () from 
/usr/lib/libgstreamer-0.10.so.0
#5  0x00007f947709ce7e in ?? () from /usr/lib/libgstreamer-0.10.so.0
#6  0x0000000000409744 in ?? ()
#7  0x00007f94761ca92a in ?? () from /usr/lib/libgstaudio-0.10.so.0
#8  0x00007f94761cad24 in gst_audio_default_registry_mixer_filter () from 
/usr/lib/libgstaudio-0.10.so.0
#9  0x000000000040954a in ?? ()
#10 0x00007f9475c535a6 in __libc_start_main () from /lib/libc.so.6
#11 0x0000000000407e79 in ?? ()
#12 0x00007fff80b5eff8 in ?? ()
#13 0x000000000000001c in ?? ()
#14 0x0000000000000001 in ?? ()
#15 0x00007fff80b6072a in ?? ()
#16 0x0000000000000000 in ?? ()
(gdb) 


from attaching gdb to gnome-volume-control while it was hung and telling it 'bt'

so is _this_ any help? i'm happy to provide more info if you need it.

-- 
volume control will never open from the menu and will never appear on panel
https://bugs.launchpad.net/bugs/344728
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