here you have a stacktrace from gdb, if you care...  (upstream maintainer produced that patch from it.. shouldn't be useful)

>thread
Current thread = 252 (Thread 0xa18feb70 (LWP 1982))


>(backtrace command)
Thread 260 (Thread 0x9a0f6b70 (LWP 1991)):
#0  0x0012e416 in __kernel_vsyscall ()
#1  0x003e6038 in ppoll () from /lib/libc.so.6
#2  0x01799cf9 in gst_poll_wait () from /usr/lib/libgstreamer-0.10.so.0
#3  0x017adc93 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#4  0x017ae730 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#5  0x01768a61 in gst_clock_id_wait () from /usr/lib/libgstreamer-0.10.so.0
#6  0x02005a1c in ?? () from /usr/lib/gstreamer-0.10/libgstrtpmanager.so
#7  0x0054d48f in g_thread_create_proxy (data=0xa729268) at /build/buildd/glib2.0-2.26.0/glib/gthread.c:1897
#8  0x00134cc9 in start_thread () from /lib/libpthread.so.0
#9  0x003f469e in clone () from /lib/libc.so.6

Thread 259 (Thread 0x9a8f7b70 (LWP 1989)):
#0  0x0012e416 in __kernel_vsyscall ()
#1  0x001394dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x021bec42 in ?? () from /usr/lib/libgstaudio-0.10.so.0
#3  0x021bf77e in gst_ring_buffer_read () from /usr/lib/libgstaudio-0.10.so.0
#4  0x021cc39f in ?? () from /usr/lib/libgstaudio-0.10.so.0
#5  0x01718341 in ?? () from /usr/lib/libgstbase-0.10.so.0
#6  0x0171a207 in ?? () from /usr/lib/libgstbase-0.10.so.0
#7  0x017b4cd9 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#8  0x017b62b7 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#9  0x0054f3d4 in g_thread_pool_thread_proxy (data=0x8743320) at /build/buildd/glib2.0-2.26.0/glib/gthreadpool.c:319
#10 0x0054d48f in g_thread_create_proxy (data=0xa5900798) at /build/buildd/glib2.0-2.26.0/glib/gthread.c:1897
#11 0x00134cc9 in start_thread () from /lib/libpthread.so.0
#12 0x003f469e in clone () from /lib/libc.so.6

Thread 258 (Thread 0x9c4fbb70 (LWP 1988)):
#0  0x0012e416 in __kernel_vsyscall ()
#1  0x001394ad in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x0230663c in pa_cond_wait () from /usr/lib/libpulsecommon-0.9.21.so
#3  0x02289c20 in pa_threaded_mainloop_wait () from /usr/lib/libpulse.so.0
#4  0x02251c3b in ?? () from /usr/lib/gstreamer-0.10/libgstpulse.so
#5  0x021d10ee in ?? () from /usr/lib/libgstaudio-0.10.so.0
#6  0x0054d48f in g_thread_create_proxy (data=0x85a0810) at /build/buildd/glib2.0-2.26.0/glib/gthread.c:1897
#7  0x00134cc9 in start_thread () from /lib/libpthread.so.0
#8  0x003f469e in clone () from /lib/libc.so.6

Thread 257 (Thread 0x9d0fcb70 (LWP 1987)):
#0  0x0012e416 in __kernel_vsyscall ()
#1  0x003e5df6 in poll () from /lib/libc.so.6
#2  0x00533a1b in g_poll (fds=0x94a7a80, nfds=2, timeout=-1) at /build/buildd/glib2.0-2.26.0/glib/gpoll.c:132
---Type <return> to continue, or q <return> to quit---
#3  0x0052643c in g_main_context_poll (context=0x9153d80, block=<value optimized out>, dispatch=1, self=0xa5913798) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:3093
#4  g_main_context_iterate (context=0x9153d80, block=<value optimized out>, dispatch=1, self=0xa5913798) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2775
#5  0x00526ba7 in g_main_loop_run (loop=0xa760580) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2988
#6  0x021a2fee in ?? () from /usr/lib/gstreamer-0.10/libgstnice.so
#7  0x01718341 in ?? () from /usr/lib/libgstbase-0.10.so.0
#8  0x0171a207 in ?? () from /usr/lib/libgstbase-0.10.so.0
#9  0x017b4cd9 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#10 0x017b62b7 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#11 0x0054f3d4 in g_thread_pool_thread_proxy (data=0x8743320) at /build/buildd/glib2.0-2.26.0/glib/gthreadpool.c:319
#12 0x0054d48f in g_thread_create_proxy (data=0xa5913798) at /build/buildd/glib2.0-2.26.0/glib/gthread.c:1897
#13 0x00134cc9 in start_thread () from /lib/libpthread.so.0
#14 0x003f469e in clone () from /lib/libc.so.6

Thread 256 (Thread 0xa621fb70 (LWP 1986)):
#0  0x0012e416 in __kernel_vsyscall ()
#1  0x003e5df6 in poll () from /lib/libc.so.6
#2  0x00533a1b in g_poll (fds=0xa8dda48, nfds=2, timeout=-1) at /build/buildd/glib2.0-2.26.0/glib/gpoll.c:132
#3  0x0052643c in g_main_context_poll (context=0xa7c01d0, block=<value optimized out>, dispatch=1, self=0xa59057a0) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:3093
#4  g_main_context_iterate (context=0xa7c01d0, block=<value optimized out>, dispatch=1, self=0xa59057a0) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2775
#5  0x00526ba7 in g_main_loop_run (loop=0x9101f80) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2988
#6  0x021a2fee in ?? () from /usr/lib/gstreamer-0.10/libgstnice.so
#7  0x01718341 in ?? () from /usr/lib/libgstbase-0.10.so.0
#8  0x0171a207 in ?? () from /usr/lib/libgstbase-0.10.so.0
#9  0x017b4cd9 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#10 0x017b62b7 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#11 0x0054f3d4 in g_thread_pool_thread_proxy (data=0x8743320) at /build/buildd/glib2.0-2.26.0/glib/gthreadpool.c:319
#12 0x0054d48f in g_thread_create_proxy (data=0xa59057a0) at /build/buildd/glib2.0-2.26.0/glib/gthread.c:1897
#13 0x00134cc9 in start_thread () from /lib/libpthread.so.0
#14 0x003f469e in clone () from /lib/libc.so.6

Thread 254 (Thread 0x9b0f8b70 (LWP 1984)):
#0  0x0012e416 in __kernel_vsyscall ()
#1  0x003e5df6 in poll () from /lib/libc.so.6
#2  0x0228a562 in ?? () from /usr/lib/libpulse.so.0
#3  0x02276ab9 in pa_mainloop_poll () from /usr/lib/libpulse.so.0
#4  0x02278a73 in pa_mainloop_iterate () from /usr/lib/libpulse.so.0
#5  0x02278b44 in pa_mainloop_run () from /usr/lib/libpulse.so.0
#6  0x0228a303 in ?? () from /usr/lib/libpulse.so.0
#7  0x02307bd5 in ?? () from /usr/lib/libpulsecommon-0.9.21.so
#8  0x00134cc9 in start_thread () from /lib/libpthread.so.0
#9  0x003f469e in clone () from /lib/libc.so.6

Thread 253 (Thread 0x9b8f9b70 (LWP 1983)):
---Type <return> to continue, or q <return> to quit---
#0  0x0012e416 in __kernel_vsyscall ()
#1  0x003e5df6 in poll () from /lib/libc.so.6
#2  0x0228a562 in ?? () from /usr/lib/libpulse.so.0
#3  0x02276ab9 in pa_mainloop_poll () from /usr/lib/libpulse.so.0
#4  0x02278a73 in pa_mainloop_iterate () from /usr/lib/libpulse.so.0
#5  0x02278b44 in pa_mainloop_run () from /usr/lib/libpulse.so.0
#6  0x0228a303 in ?? () from /usr/lib/libpulse.so.0
#7  0x02307bd5 in ?? () from /usr/lib/libpulsecommon-0.9.21.so
#8  0x00134cc9 in start_thread () from /lib/libpthread.so.0
#9  0x003f469e in clone () from /lib/libc.so.6

Thread 252 (Thread 0xa18feb70 (LWP 1982)):
#0  0x0205b8da in _upnp_error_mapping_port (self=0xa8a5cd8, error=0x0, proto=0xa923d90 "UDP", external_port=0, local_ip=0xa7fe358 "123.45.67.89", local_port=60150, 
    description=0xa924c18 "libnice 0.0.12", user_data=0xa8d23e0) at agent.c:1677
#1  0x01e74f7b in _gupnp_simple_igd_marshal_VOID__POINTER_STRING_UINT_STRING_UINT_STRING (closure=0x9025780, return_value=0x0, n_param_values=7, param_values=0x9147360, 
    invocation_hint=0xa18fde40, marshal_data=0x205b8a0) at gupnp-simple-igd-marshal.c:134
#2  0x004a1412 in g_closure_invoke (closure=0x9025780, return_value=0x0, n_param_values=7, param_values=0x9147360, invocation_hint=0xa18fde40)
    at /build/buildd/glib2.0-2.26.0/gobject/gclosure.c:766
#3  0x004b7595 in signal_emit_unlocked_R (node=<value optimized out>, detail=<value optimized out>, instance=0xa8a5cd8, emission_return=0x0, instance_and_params=0x9147360)
    at /build/buildd/glib2.0-2.26.0/gobject/gsignal.c:3252
#4  0x004b89bc in g_signal_emit_valist (instance=0xa8a5cd8, signal_id=375, detail=3444, var_args=0xa18fe024 "") at /build/buildd/glib2.0-2.26.0/gobject/gsignal.c:2983
#5  0x004b8e62 in g_signal_emit (instance=0xa8a5cd8, signal_id=375, detail=3444) at /build/buildd/glib2.0-2.26.0/gobject/gsignal.c:3040
#6  0x01e73754 in _service_proxy_got_external_ip_address (proxy=0x9104b80, action=0xa8da4e0, user_data=0xa8da4c0) at gupnp-simple-igd.c:620
#7  0x02092472 in action_got_response (session=0x9105830, msg=0x94a8678, action=0x7be) at gupnp-service-proxy.c:761
#8  0x020dc738 in ?? () from /usr/lib/libsoup-2.4.so.1
#9  0x020dc95d in ?? () from /usr/lib/libsoup-2.4.so.1
#10 0x020dca28 in ?? () from /usr/lib/libsoup-2.4.so.1
#11 0x00520841 in g_idle_dispatch (source=0xa925f28, callback=0, user_data=0x9105830) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:4254
#12 0x00522855 in g_main_dispatch (context=0x949d8f0) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2149
#13 g_main_context_dispatch (context=0x949d8f0) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2702
#14 0x00526668 in g_main_context_iterate (context=0x949d8f0, block=<value optimized out>, dispatch=1, self=0xa7b8980) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2780
#15 0x00526ba7 in g_main_loop_run (loop=0x94a7a10) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2988
#16 0x01e74d69 in thread_func (dat=0xa7616a8) at gupnp-simple-igd-thread.c:269
#17 0x0054d48f in g_thread_create_proxy (data=0xa7b8980) at /build/buildd/glib2.0-2.26.0/glib/gthread.c:1897
#18 0x00134cc9 in start_thread () from /lib/libpthread.so.0
#19 0x003f469e in clone () from /lib/libc.so.6

Thread 251 (Thread 0xa6a20b70 (LWP 1981)):
#0  0x0012e416 in __kernel_vsyscall ()
#1  0x003e5df6 in poll () from /lib/libc.so.6
#2  0x00533a1b in g_poll (fds=0xa743718, nfds=1, timeout=-1) at /build/buildd/glib2.0-2.26.0/glib/gpoll.c:132
#3  0x0052643c in g_main_context_poll (context=0x9017300, block=<value optimized out>, dispatch=1, self=0xa7451e0) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:3093
#4  g_main_context_iterate (context=0x9017300, block=<value optimized out>, dispatch=1, self=0xa7451e0) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2775
---Type <return> to continue, or q <return> to quit---
#5  0x00526ba7 in g_main_loop_run (loop=0x9430b00) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2988
#6  0x0204e694 in fs_nice_agent_main_thread (data=0x94a57b0) at fs-nice-agent.c:316
#7  0x0054d48f in g_thread_create_proxy (data=0xa7451e0) at /build/buildd/glib2.0-2.26.0/glib/gthread.c:1897
#8  0x00134cc9 in start_thread () from /lib/libpthread.so.0
#9  0x003f469e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb7fe76c0 (LWP 10646)):
#0  0x0012e416 in __kernel_vsyscall ()
#1  0x003e5df6 in poll () from /lib/libc.so.6
#2  0x00533a1b in g_poll (fds=0x9107f98, nfds=10, timeout=18) at /build/buildd/glib2.0-2.26.0/glib/gpoll.c:132
#3  0x0052643c in g_main_context_poll (context=0x85a25c0, block=<value optimized out>, dispatch=1, self=0x83a5fe0) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:3093
#4  g_main_context_iterate (context=0x85a25c0, block=<value optimized out>, dispatch=1, self=0x83a5fe0) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2775
#5  0x00526ba7 in g_main_loop_run (loop=0x8fe66b8) at /build/buildd/glib2.0-2.26.0/glib/gmain.c:2988
#6  0x0093b1d9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#7  0x0076c060 in ?? () from /usr/lib/pymodules/python2.6/gtk-2.0/gtk/_gtk.so
#8  0x080ddd39 in PyEval_EvalFrameEx ()
#9  0x080dfbb2 in PyEval_EvalCodeEx ()
#10 0x080dfca7 in PyEval_EvalCode ()
#11 0x080fd956 in PyRun_FileExFlags ()
#12 0x080fdbb2 in PyRun_SimpleFileExFlags ()
#13 0x0805b6d3 in Py_Main ()
#14 0x0805a8ab in main ()