Here is a backtrace produced with the following sequence:

1. Boot an Intrepid CD in KVM with no -sound option
2. Start a live session
3. Confirm that the volume icon on the panel has the red "X"
4. Start pidgin
5. Options->Preferences->Sound
6. Select "Message received" (or something else with a default sound)
7. Click "preview"

pidgin then stops responding.

Thread 1 (Thread 0xb70ad700 (LWP 6527)):
#0  0xb7fce422 in __kernel_vsyscall ()
#1  0xb76cf075 in pthread_cond_wait@@GLIBC_2.3.2 () from 
/lib/tls/i686/cmov/libpthread.so.0
#2  0xb480b7ec in ?? () from /usr/lib/libpulse.so.0
#3  0xb47eac0f in pa_threaded_mainloop_wait () from /usr/lib/libpulse.so.0
#4  0xb482f989 in ?? () from /usr/lib/gstreamer-0.10/libgstpulse.so
#5  0xb482fa4e in ?? () from /usr/lib/gstreamer-0.10/libgstpulse.so
#6  0xb482fad2 in ?? () from /usr/lib/gstreamer-0.10/libgstpulse.so
#7  0xb51100a9 in ?? () from /usr/lib/libgstaudio-0.10.so.0
#8  0xb511f7c8 in gst_ring_buffer_close_device () from 
/usr/lib/libgstaudio-0.10.so.0


** Attachment added: "ThreadedStacktrace.txt"
   http://launchpadlibrarian.net/19808342/ThreadedStacktrace.txt

** Changed in: pidgin (Ubuntu)
       Status: Incomplete => Triaged

-- 
Hangs when no sound device is available
https://bugs.launchpad.net/bugs/290914
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