(gdb) bt
#0  gtk_widget_size_allocate_with_baseline (widget=0x0, allocation=allocation@entry=0x7fffffffc580, baseline=baseline@entry=-1) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwidget.c:5932
#1  0x00007ffff631d20a in gtk_widget_size_allocate (widget=<optimized out>, allocation=allocation@entry=0x7fffffffc580) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwidget.c:6151
#2  0x00007ffff613ca55 in gtk_combo_box_size_allocate (widget=0x84c250, allocation=0x7fffffffc960) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkcombobox.c:2701
#3  0x00007ffff52af020 in g_cclosure_marshal_VOID__BOXEDv () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#4  0x00007ffff52ac36f in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#5  0x00007ffff52c4728 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6  0x00007ffff52c5372 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#7  0x00007ffff631ce79 in gtk_widget_size_allocate_with_baseline (widget=0x84c250, allocation=allocation@entry=0x7fffffffca90, baseline=baseline@entry=-1)
    at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwidget.c:6075
#8  0x00007ffff6102f15 in gtk_box_size_allocate_no_center (widget=0x7fffd800b7b0, allocation=0x7fffffffce80) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkbox.c:800
#9  0x00007ffff52af020 in g_cclosure_marshal_VOID__BOXEDv () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#10 0x00007ffff52ac36f in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007ffff52c4728 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007ffff52c5372 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007ffff631ce79 in gtk_widget_size_allocate_with_baseline (widget=0x7fffd800b7b0, allocation=allocation@entry=0x7fffffffcfe0, baseline=baseline@entry=-1)
    at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwidget.c:6075
#14 0x00007ffff6102f15 in gtk_box_size_allocate_no_center (widget=0x7fffd800b660, allocation=0x7fffffffd3d0) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkbox.c:800
#15 0x00007ffff52af020 in g_cclosure_marshal_VOID__BOXEDv () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#16 0x00007ffff52ac36f in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#17 0x00007ffff52c4728 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#18 0x00007ffff52c5372 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#19 0x00007ffff631ce79 in gtk_widget_size_allocate_with_baseline (widget=widget@entry=0x7fffd800b660, allocation=allocation@entry=0x7fffffffd440, baseline=baseline@entry=-1)
    at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwidget.c:6075
#20 0x00007ffff631d20a in gtk_widget_size_allocate (widget=widget@entry=0x7fffd800b660, allocation=allocation@entry=0x7fffffffd440) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwidget.c:6151
#21 0x00007ffff6332d13 in gtk_window_size_allocate (widget=<optimized out>, allocation=<optimized out>) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwindow.c:7324
#22 0x00007ffff60f5f35 in gtk_application_window_real_size_allocate (widget=0x7cc4d0, allocation=<optimized out>) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkapplicationwindow.c:642
#23 0x00007ffff52af020 in g_cclosure_marshal_VOID__BOXEDv () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#24 0x00007ffff52ac3f7 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#25 0x00007ffff52c4728 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#26 0x00007ffff52c5372 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#27 0x00007ffff631ce79 in gtk_widget_size_allocate_with_baseline (widget=widget@entry=0x7cc4d0, allocation=allocation@entry=0x7fffffffd8d0, baseline=baseline@entry=-1)
    at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwidget.c:6075
#28 0x00007ffff631d20a in gtk_widget_size_allocate (widget=widget@entry=0x7cc4d0, allocation=allocation@entry=0x7fffffffd8d0) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwidget.c:6151
#29 0x00007ffff632f023 in gtk_window_show (widget=0x7cc4d0) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwindow.c:5790
#30 0x00007ffff52ac1c8 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#31 0x00007ffff52bcc07 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#32 0x00007ffff52c50b8 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#33 0x00007ffff52c5372 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#34 0x00007ffff631e6ec in gtk_widget_show (widget=0x7cc4d0) at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwidget.c:4853
#35 0x00007ffff7b9f9e8 in empathy_window_present_with_time () from /usr/lib/empathy/libempathy-gtk-3.8.6.so
#36 0x000000000042a5f0 in ?? ()
#37 0x00007ffff52ac3f7 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#38 0x00007ffff52c4728 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#39 0x00007ffff52c5372 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#40 0x000000000042adb6 in ?? ()
#41 0x00007ffff559037b in g_application_run () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#42 0x000000000041654d in main ()
(gdb) i th
  Id   Target Id         Frame 
  4    Thread 0x7fffdc92b700 (LWP 21921) "pool" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  3    Thread 0x7fffdd861700 (LWP 21920) "gdbus" 0x00007ffff4a9a12d in poll () at ../sysdeps/unix/syscall-template.S:81
  2    Thread 0x7fffde062700 (LWP 21919) "dconf worker" 0x00007ffff4a9a12d in poll () at ../sysdeps/unix/syscall-template.S:81
* 1    Thread 0x7ffff7f9ba40 (LWP 21914) "empathy" gtk_widget_size_allocate_with_baseline (widget=0x0, allocation=allocation@entry=0x7fffffffc580, baseline=baseline@entry=-1)
    at /build/buildd/gtk+3.0-3.14.12/./gtk/gtkwidget.c:5932
(gdb) i lo
priv = <optimized out>
real_allocation = {x = 0, y = 0, width = 8749072, height = 0}
old_allocation = <optimized out>
old_clip = {x = 0, y = 0, width = 0, height = 0}
adjusted_allocation = {x = -15024, y = 32767, width = -165211877, height = 32767}
alloc_needed = <optimized out>
size_changed = <optimized out>
baseline_changed = <optimized out>
position_changed = <optimized out>
natural_width = 32767
natural_height = -164037784
dummy = 32767
min_width = -15156
min_height = 32767
old_baseline = <optimized out>
__FUNCTION__ = "gtk_widget_size_allocate_with_baseline"