.
Thread 3 (process 15748):
#0  0x00007f91444b956d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00007f9144d32675 in g_cond_timed_wait_posix_impl (cond=0x186f5d4, 
    entered_mutex=0x7f9145de5748, abs_time=<value optimized out>)
    at /build/buildd/glib2.0-2.19.8/gthread/gthread-posix.c:242
	result = <value optimized out>
	end_time = {tv_sec = 1235740606, tv_nsec = 450315000}
	timed_out = <value optimized out>
	__PRETTY_FUNCTION__ = "g_cond_timed_wait_posix_impl"
#2  0x00007f9145b376bb in g_async_queue_pop_intern_unlocked (queue=0x1630bb0, 
    try=0, end_time=0x7f913ea3f010)
    at /build/buildd/glib2.0-2.19.8/glib/gasyncqueue.c:365
	retval = <value optimized out>
	__PRETTY_FUNCTION__ = "g_async_queue_pop_intern_unlocked"
#3  0x00007f9145b86209 in g_thread_pool_thread_proxy (
    data=<value optimized out>)
    at /build/buildd/glib2.0-2.19.8/glib/gthreadpool.c:220
	task = (gpointer) 0x1923670
	pool = (GRealThreadPool *) 0x174a6e0
#4  0x00007f9145b84c74 in g_thread_create_proxy (data=0x186e630)
    at /build/buildd/glib2.0-2.19.8/glib/gthread.c:635
	__PRETTY_FUNCTION__ = "g_thread_create_proxy"
#5  0x00007f91444b53ba in start_thread () from /lib/libpthread.so.0
#6  0x00007f9145894fcd in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()
.
Thread 2 (process 15747):
#0  0x00007f914588b496 in poll () from /lib/libc.so.6
#1  0x00007f913f49664c in ?? () from /usr/lib/libasound.so.2
#2  0x00007f913f4969b7 in ?? () from /usr/lib/libasound.so.2
#3  0x00007f913f4a20da in snd_pcm_mmap_writei () from /usr/lib/libasound.so.2
#4  0x00007f913f72870e in ?? ()
   from /usr/lib/libcanberra-0.11/libcanberra-alsa.so
#5  0x00007f91444b53ba in start_thread () from /lib/libpthread.so.0
#6  0x00007f9145894fcd in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()
.
Thread 1 (process 15744):
#0  IA__g_logv (log_domain=0x7f9147bc02c3 "Gdk", log_level=G_LOG_LEVEL_ERROR, 
    format=0x7f9147bdda87 "%s", args1=0x7fff51c54c60)
    at /build/buildd/glib2.0-2.19.8/glib/gmessages.c:503
	depth = <value optimized out>
	domain = (GLogDomain *) 0x1767650
	data = (gpointer) 0x0
	log_func = (GLogFunc) 0x7f9145b64b10 <IA__g_log_default_handler>
	domain_fatal_mask = 5
	test_level = G_LOG_FLAG_FATAL
	was_recursion = 0
	i = <value optimized out>
#1  0x00007f9145b65463 in IA__g_log (log_domain=0x7f9145b1ca00 "", 
    log_level=1166980496, format=0x17747f0 "`")
    at /build/buildd/glib2.0-2.19.8/glib/gmessages.c:517
	args = {{gp_offset = 32, fp_offset = 48, 
    overflow_arg_area = 0x7fff51c54d40, reg_save_area = 0x7fff51c54c80}}
#2  0x00007f9147ba8652 in gdk_x_error (display=<value optimized out>, 
    error=<value optimized out>)
    at /build/buildd/gtk+2.0-2.15.4/gdk/x11/gdkmain-x11.c:641
	buf = "BadWindow (invalid Window parameter)", '\0' <repeats 27 times>
#3  0x00007f91486ba5b4 in _XError () from /usr/lib/libX11.so.6
#4  0x00007f91486c206b in _XReply () from /usr/lib/libX11.so.6
#5  0x00007f91486b01fc in XQueryTree () from /usr/lib/libX11.so.6
#6  0x000000000040aa94 in screenshot_get_pixbuf ()
#7  0x00000000004089f4 in ?? ()
#8  0x00007f9146e065dc in mainloop_proxy_func (data=<value optimized out>)
    at /build/buildd/glib2.0-2.19.8/gio/gioscheduler.c:314
	proxy = (MainLoopProxy *) 0x175cae0
#9  0x00007f9145b5b19a in IA__g_main_context_dispatch (context=0x1500f70)
    at /build/buildd/glib2.0-2.19.8/glib/gmain.c:1814
No locals.
#10 0x00007f9145b5e870 in g_main_context_iterate (context=0x1500f70, block=1, 
    dispatch=1, self=<value optimized out>)
    at /build/buildd/glib2.0-2.19.8/glib/gmain.c:2448
	max_priority = 0
	timeout = 0
	some_ready = 1
	nfds = 7
	allocated_nfds = <value optimized out>
	fds = (GPollFD *) 0x1881a70
	__PRETTY_FUNCTION__ = "g_main_context_iterate"
#11 0x00007f9145b5ed3d in IA__g_main_loop_run (loop=0x1753f90)
    at /build/buildd/glib2.0-2.19.8/glib/gmain.c:2656
	self = (GThread *) 0x14df380
	__PRETTY_FUNCTION__ = "IA__g_main_loop_run"
#12 0x00007f9147f452e7 in IA__gtk_main ()
    at /build/buildd/gtk+2.0-2.15.4/gtk/gtkmain.c:1205
	tmp_list = (GList *) 0x154f7c0
	functions = (GList *) 0x0
	init = (GtkInitFunction *) 0xfffffffb
	loop = <value optimized out>
#13 0x0000000000407c96 in main ()