[cairo-bugs] [Bug 63196] New: segfault in composite_aligned_boxes if image upload has a negative coordinate

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Apr 5 20:18:37 PDT 2013 

https://bugs.freedesktop.org/show_bug.cgi?id=63196

          Priority: medium
            Bug ID: 63196
          Assignee: chris at chris-wilson.co.uk
           Summary: segfault in composite_aligned_boxes if image upload
                    has a negative coordinate
        QA Contact: cairo-bugs at cairographics.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: prahal at yahoo.com
          Hardware: Other
            Status: NEW
           Version: 1.12.14
         Component: general
           Product: cairo

if cairo_surface_create_similar_scratch returns an CAIRO_SURFACE_TYPE_IMAGE
in surface_source, then
http://cgit.freedesktop.org/cairo/tree/src/cairo-xlib-source.c#n1008 returns
None as surface.
But the caller composite_aligned_box then dereference this returned surface to
get its status, with None it segfaults.
http://cgit.freedesktop.org/cairo/tree/src/cairo-traps-compositor.c#n1276


This happens for me with
p limit
{x = 0, y = 0, width = 42061, height = 1}

p upload
{x = -1, y = -1, width = 878, height = 3}


that is : http://cgit.freedesktop.org/cairo/tree/src/cairo-xlib-source.c#n990

        if (upload.x < limit.x ||
        upload.x + upload.width > limit.x + limit.width ||
        upload.y < limit.y ||
        upload.y + upload.height > limit.y + limit.height)
        {
        upload = limit;
        }
upload is replaced by the bigger limit rectangle.

I replace this section of code with:


            if (upload.x < limit.x) upload.x = limit.x;
            if (upload.y < limit.y) upload.y = limit.y;
            if (upload.x + upload.width > limit.x + limit.width) {
                upload.x = limit.x;
                upload.width = limit.width;
            }
            if (upload.y + upload.height > limit.y + limit.height)
            {
                upload.y = limit.y;
                upload.height = limit.height;
            }


to trim the "upload" to the "limit" rectangle and my testcase, ie dconf-editor
going to "org" > "gnome" , click on  "shell" is not segfaulting anymore.

Though the returns None might be wrong too (or the callers should check for
None).



Backtrace at the point where it return None:

Breakpoint 1, surface_source (src_y=0x7fffffff87d0, src_x=0x7fffffff87cc,
sample=<optimized out>, extents=<optimized out>, is_mask=0, pattern=
    0x7fffffff9090, dst=0xf5b650) at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-xlib-source.c:995
995            upload = limit;
(gdb) p limit
$4 = {x = 0, y = 0, width = 42061, height = 1}
(gdb) bt
#0  surface_source (src_y=0x7fffffff87d0, src_x=0x7fffffff87cc,
sample=<optimized out>, extents=<optimized out>, is_mask=0,
pattern=0x7fffffff9090, 
    dst=0xf5b650) at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-xlib-source.c:995
#1  _cairo_xlib_source_create_for_pattern (_dst=0xf5b650,
pattern=0x7fffffff9090, is_mask=0, extents=<optimized out>, sample=<optimized
out>, src_x=
    0x7fffffff87cc, src_y=0x7fffffff87d0) at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-xlib-source.c:1134
#2  0x00007ffff600a50e in composite_aligned_boxes (boxes=0x7fffffff8bf0,
extents=0x7fffffff9010, compositor=0x7ffff62a9a80 <compositor.16166>)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-traps-compositor.c:1272
#3  clip_and_composite_boxes (compositor=compositor at entry=0x7ffff62a9a80
<compositor.16166>, extents=extents at entry=0x7fffffff9010, boxes=boxes at entry=
    0x7fffffff8bf0) at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-traps-compositor.c:1766
#4  0x00007ffff600b2c7 in _cairo_traps_compositor_fill
(_compositor=0x7ffff62a9a80 <compositor.16166>, extents=0x7fffffff9010,
path=0x7fffffff9560, 
    fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001,
antialias=CAIRO_ANTIALIAS_DEFAULT)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-traps-compositor.c:2215
#5  0x00007ffff5fb1bb7 in _cairo_compositor_fill (compositor=0x7ffff62a9a80
<compositor.16166>, surface=surface at entry=0xf5b650, op=op at entry=
    CAIRO_OPERATOR_OVER, source=source at entry=0x7fffffff9440,
path=path at entry=0x7fffffff9560,
fill_rule=fill_rule at entry=CAIRO_FILL_RULE_WINDING, 
    tolerance=0.10000000000000001,
antialias=antialias at entry=CAIRO_ANTIALIAS_DEFAULT, clip=clip at entry=0xef69e0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-compositor.c:203
#6  0x00007ffff6025088 in _cairo_xlib_surface_fill (_surface=<optimized out>,
op=CAIRO_OPERATOR_OVER, source=0x7fffffff9440, path=0x7fffffff9560, 
    fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=<optimized out>,
antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0xef69e0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-xlib-surface.c:1645
#7  0x00007ffff5ff8544 in _cairo_surface_fill (surface=0xf5b650,
op=CAIRO_OPERATOR_OVER, source=0x7fffffff9440, path=0x7fffffff9560, fill_rule=
    CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001,
antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0xef69e0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-surface.c:2238
#8  0x00007ffff5ffd053 in _cairo_surface_offset_fill (surface=0xf5b650, x=-278,
y=-1, op=op at entry=CAIRO_OPERATOR_OVER, source=0x7fffffff9440, 
    source at entry=0x7fffffff98e0, path=path at entry=0xdb9678,
fill_rule=fill_rule at entry=CAIRO_FILL_RULE_WINDING, tolerance=tolerance at entry=
    0.10000000000000001, antialias=antialias at entry=CAIRO_ANTIALIAS_DEFAULT,
clip=clip at entry=0xec4aa0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-surface-offset.c:239
#9  0x00007ffff5ffda77 in _cairo_surface_subsurface_fill
(abstract_surface=0xe88490, op=CAIRO_OPERATOR_OVER, source=0x7fffffff98e0,
path=0xdb9678, 
    fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001,
antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0xed6730)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-surface-subsurface.c:165
#10 0x00007ffff5ff8544 in _cairo_surface_fill (surface=0xe88490,
op=CAIRO_OPERATOR_OVER, source=0x7fffffff98e0, path=0xdb9678, fill_rule=
    CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001,
antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0xed6730)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-surface.c:2238
#11 0x00007ffff5fb9ccc in _cairo_gstate_fill (gstate=0xf005e0,
path=path at entry=0xdb9678)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-gstate.c:1308
#12 0x00007ffff5fb3349 in _cairo_default_context_fill (abstract_cr=0xdb9310)
---Type <return> to continue, or q <return> to quit---
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-default-context.c:1053
#13 0x00007ffff5faca85 in cairo_fill (cr=0xdb9310) at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo.c:2201
#14 0x00007ffff7494d4f in gtk_border_image_render_slice (cr=0xdb9310,
slice=0xf5fa00, slice_width=42061, slice_height=1, x=0, y=0, width=42062, 
    height=1, hrepeat=GTK_CSS_REPEAT_STYLE_NO_REPEAT,
vrepeat=GTK_CSS_REPEAT_STYLE_NO_REPEAT)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkborderimage.c:210
#15 0x00007ffff74954cc in _gtk_border_image_render (image=0x7fffffff9de0,
border_width=0x7fffffff9d50, cr=0xdb9310, x=0, y=0, width=42062, height=28)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkborderimage.c:306
#16 0x00007ffff76ffc67 in render_frame_internal (engine=0x701440
[AdwaitaEngine], cr=0xdb9310, x=0, y=0, width=42062, height=28, hidden_side=0, 
    junction=GTK_JUNCTION_NONE) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkthemingengine.c:1734
#17 0x00007ffff77001ce in gtk_theming_engine_render_frame (engine=0x701440
[AdwaitaEngine], cr=0xdb9310, x=0, y=0, width=42062, height=28)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkthemingengine.c:1784
#18 0x00007ffff769f5f7 in gtk_render_frame (context=0xe2a920 [GtkStyleContext],
cr=0xdb9310, x=0, y=0, width=42062, height=28)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkstylecontext.c:3958
#19 0x00007ffff74a8d1b in gtk_button_draw (widget=0xdd8720 [GtkButton],
cr=0xdb9310)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkbutton.c:1724
#20 0x00007ffff75d9580 in _gtk_marshal_BOOLEAN__BOXEDv (closure=0x6654f0,
return_value=0x7fffffffa300, instance=0xdd8720, args=0x7fffffffa4a8, 
    marshal_data=0x7ffff74a8abc <gtk_button_draw>, n_params=1,
param_types=0x665560) at gtkmarshalers.c:130
#21 0x00007ffff777c8bc in gtk_widget_draw_marshallerv (closure=0x6654f0,
return_value=0x7fffffffa300, instance=0xdd8720, args=0x7fffffffa4a8, 
    marshal_data=0x7ffff74a8abc <gtk_button_draw>, n_params=1,
param_types=0x665560)
    at /home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkwidget.c:906
#22 0x00007ffff5d40484 in g_type_class_meta_marshalv (closure=0x6654f0,
return_value=0x7fffffffa300, instance=0xdd8720, args=0x7fffffffa4a8, 
    marshal_data=0x120, n_params=1, param_types=0x665560) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gclosure.c:997
#23 0x00007ffff5d40047 in _g_closure_invoke_va (closure=0x6654f0,
return_value=0x7fffffffa300, instance=0xdd8720, args=0x7fffffffa4a8,
n_params=1, 
    param_types=0x665560) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gclosure.c:840
#24 0x00007ffff5d5bf82 in g_signal_emit_valist (instance=0xdd8720,
signal_id=34, detail=0, var_args=0x7fffffffa4a8)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3234
#25 0x00007ffff5d5d171 in g_signal_emit (instance=0xdd8720, signal_id=34,
detail=0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3384
#26 0x00007ffff7786443 in _gtk_widget_draw_internal (widget=0xdd8720
[GtkButton], cr=0xdb9310, clip_to_size=1)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkwidget.c:6173
#27 0x00007ffff74fcdd6 in gtk_container_propagate_draw (container=0xe304f0
[DConfKeyView], child=0xdd8720 [GtkButton], cr=0xdb9310)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkcontainer.c:3375
#28 0x00007ffff7750ad8 in gtk_tree_view_draw (widget=0xe304f0 [DConfKeyView],
cr=0xdb9310)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtktreeview.c:5427
---Type <return> to continue, or q <return> to quit---
#29 0x00007ffff75d9580 in _gtk_marshal_BOOLEAN__BOXEDv (closure=0x6654f0,
return_value=0x7fffffffaa40, instance=0xe304f0, args=0x7fffffffabe8, 
    marshal_data=0x7ffff77508c6 <gtk_tree_view_draw>, n_params=1,
param_types=0x665560) at gtkmarshalers.c:130
#30 0x00007ffff777c8bc in gtk_widget_draw_marshallerv (closure=0x6654f0,
return_value=0x7fffffffaa40, instance=0xe304f0, args=0x7fffffffabe8, 
    marshal_data=0x7ffff77508c6 <gtk_tree_view_draw>, n_params=1,
param_types=0x665560)
    at /home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkwidget.c:906
#31 0x00007ffff5d40484 in g_type_class_meta_marshalv (closure=0x6654f0,
return_value=0x7fffffffaa40, instance=0xe304f0, args=0x7fffffffabe8, 
    marshal_data=0x120, n_params=1, param_types=0x665560) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gclosure.c:997
#32 0x00007ffff5d40047 in _g_closure_invoke_va (closure=0x6654f0,
return_value=0x7fffffffaa40, instance=0xe304f0, args=0x7fffffffabe8,
n_params=1, 
    param_types=0x665560) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gclosure.c:840
#33 0x00007ffff5d5bf82 in g_signal_emit_valist (instance=0xe304f0,
signal_id=34, detail=0, var_args=0x7fffffffabe8)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3234
#34 0x00007ffff5d5d171 in g_signal_emit (instance=0xe304f0, signal_id=34,
detail=0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3384
#35 0x00007ffff7786443 in _gtk_widget_draw_internal (widget=0xe304f0
[DConfKeyView], cr=0xdb9310, clip_to_size=1)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkwidget.c:6173
#36 0x00007ffff77870fe in gtk_widget_send_expose (widget=0xe304f0
[DConfKeyView], event=0x7fffffffae60)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkwidget.c:6553
#37 0x00007ffff75d7a3c in gtk_main_do_event (event=0x7fffffffae60) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkmain.c:1619
#38 0x00007ffff713932e in _gdk_event_emit (event=0x7fffffffae60) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkevents.c:69
#39 0x00007ffff714c090 in _gdk_window_process_updates_recurse (window=0xe6cc20
[GdkX11Window], expose_region=0xec32a0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4006
#40 0x00007ffff714c1e3 in _gdk_window_process_updates_recurse (window=0xe6c9c0
[GdkX11Window], expose_region=0xec32a0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4051
#41 0x00007ffff714c1e3 in _gdk_window_process_updates_recurse (window=0xe6c890
[GdkX11Window], expose_region=0xec32a0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4051
#42 0x00007ffff714c1e3 in _gdk_window_process_updates_recurse (window=0xe6c170
[GdkX11Window], expose_region=0xec32a0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4051
#43 0x00007ffff714c1e3 in _gdk_window_process_updates_recurse (window=0x6a7bf0
[GdkX11Window], expose_region=0xec32a0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4051
#44 0x00007ffff714c1e3 in _gdk_window_process_updates_recurse (window=0x6a7ac0
[GdkX11Window], expose_region=0xec32a0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4051
#45 0x00007ffff718d247 in gdk_x11_window_process_updates_recurse
(window=0x6a7ac0 [GdkX11Window], region=0xec32a0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/x11/gdkwindow-x11.c:5202
#46 0x00007ffff714c4b3 in gdk_window_process_updates_internal (window=0x6a7ac0
[GdkX11Window])
---Type <return> to continue, or q <return> to quit---
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4194
#47 0x00007ffff714c8e4 in gdk_window_process_updates_with_mode (window=0x6a7ac0
[GdkX11Window], recurse_mode=2)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4374
#48 0x00007ffff715830d in gdk_window_paint_on_clock (clock=0x6b7360
[GdkFrameClockIdle], data=0x6a7ac0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:11626
#49 0x00007ffff5d42e23 in g_cclosure_marshal_VOID__VOIDv (closure=0xe67470,
return_value=0x0, instance=0x6b7360, args=0x7fffffffb7c8, marshal_data=
    0x0, n_params=0, param_types=0x0) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gmarshal.c:115
#50 0x00007ffff5d40047 in _g_closure_invoke_va (closure=0xe67470,
return_value=0x0, instance=0x6b7360, args=0x7fffffffb7c8, n_params=0,
param_types=
    0x0) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gclosure.c:840
#51 0x00007ffff5d5bf82 in g_signal_emit_valist (instance=0x6b7360,
signal_id=154, detail=0, var_args=0x7fffffffb7c8)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3234
#52 0x00007ffff5d5d2dd in g_signal_emit_by_name (instance=0x6b7360,
detailed_signal=0x7ffff7194aba "paint")
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3424
#53 0x00007ffff71405c0 in gdk_frame_clock_paint_idle (data=0x6b7360)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkframeclockidle.c:419
#54 0x00007ffff712ddf4 in gdk_threads_dispatch (data=0x7cbf60) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdk.c:806
#55 0x00007ffff5a3481a in g_timeout_dispatch (source=0xe48440,
callback=0x7ffff712ddaf <gdk_threads_dispatch>, user_data=0x7cbf60)
    at /home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/glib/gmain.c:4413
#56 0x00007ffff5a32ae4 in g_main_dispatch (context=0x64ac00) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/glib/gmain.c:3054
#57 0x00007ffff5a3383b in g_main_context_dispatch (context=0x64ac00) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/glib/gmain.c:3630
#58 0x00007ffff5a33a2d in g_main_context_iterate (context=0x64ac00, block=1,
dispatch=1, self=0x63d640)
    at /home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/glib/gmain.c:3701
#59 0x00007ffff5a33af1 in g_main_context_iteration (context=0x64ac00,
may_block=1)
    at /home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/glib/gmain.c:3762
#60 0x00007ffff6c071ea in g_application_run (application=0x645100
[ConfigurationEditor], argc=1, argv=0x7fffffffbc88)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gio/gapplication.c:1624
#61 0x000000000040d63e in configuration_editor_main (args=0x7fffffffbc88,
args_length1=1)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/dconf/editor/dconf-editor.c:2019
#62 0x000000000040d68c in main (argc=1, argv=0x7fffffffbc88) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/dconf/editor/dconf-editor.c:2028
(gdb) l
990            if ((upload.x < limit.x)
991            || (upload.x + upload.width > limit.x + limit.width)
992             || (upload.y < limit.y)
993            || (upload.y + upload.height > limit.y + limit.height))
994            {
995            upload = limit;
996            }
997        }
998        }
999    
(gdb) n
1000        xsrc = (cairo_xlib_surface_t *)
(gdb) 
1005        if (xsrc->base.type != CAIRO_SURFACE_TYPE_XLIB) {
(gdb) l
1000        xsrc = (cairo_xlib_surface_t *)
1001            _cairo_surface_create_similar_scratch (&dst->base,
1002                               src->content,
1003                               upload.width,
1004                               upload.height);
1005        if (xsrc->base.type != CAIRO_SURFACE_TYPE_XLIB) {
1006        cairo_surface_destroy (src);
1007        cairo_surface_destroy (&xsrc->base);
1008        return None;
1009        }
(gdb) p xsrc
$5 = <optimized out>
(gdb) n
1000        xsrc = (cairo_xlib_surface_t *)
(gdb) n
1005        if (xsrc->base.type != CAIRO_SURFACE_TYPE_XLIB) {
(gdb) p xsrc
$6 = (cairo_xlib_surface_t *) 0xf5fb70
(gdb) p *xsrc
$7 = {base = {backend = 0x7ffff62a6500 <cairo_xlib_shm_surface_backend>, device
= 0xe8aa00, type = CAIRO_SURFACE_TYPE_IMAGE, content = 
    CAIRO_CONTENT_COLOR_ALPHA, ref_count = {ref_count = 1}, status =
CAIRO_STATUS_SUCCESS, unique_id = 605, serial = 0, damage = 0x0, _finishing = 
    0, finished = 0, is_clear = 1, has_font_options = 1, owns_device = 1,
user_data = {size = 0, num_elements = 0, element_size = 24, elements = 
    0x0}, mime_data = {size = 0, num_elements = 0, element_size = 24, elements
= 0x0}, device_transform = {xx = 1, yx = 0, xy = 0, yy = 1, x0 = 0, 
      y0 = 0}, device_transform_inverse = {xx = 1, yx = 0, xy = 0, yy = 1, x0 =
0, y0 = 0}, device_transform_observers = {next = 0xf5fc38, prev = 
    0xf5fc38}, x_resolution = 72, y_resolution = 72, x_fallback_resolution =
300, y_fallback_resolution = 300, snapshot_of = 0x0, snapshot_detach = 
    0x2000, snapshots = {next = 0xf5fc78, prev = 0xf5fc78}, snapshot = {next =
0x0, prev = 0xf00000001}, font_options = {antialias = 
    CAIRO_ANTIALIAS_SUBPIXEL, subpixel_order = CAIRO_SUBPIXEL_ORDER_RGB,
lcd_filter = CAIRO_LCD_FILTER_DEFAULT, hint_style = CAIRO_HINT_STYLE_FULL, 
      hint_metrics = CAIRO_HINT_METRICS_ON, round_glyph_positions =
CAIRO_ROUND_GLYPH_POS_ON}}, picture = 16121136, drawable = 140737323370368, 
  compositor = 0x0, shm = 0x20028888, fallback = -500600832, display =
0x10000a44d, screen = 0x2000029134, link = {next = 0x101e, prev = 0xf5da20}, 
  dpy = 0xe71418, owns_pixmap = 15206144, visual = 0x0, use_pixmap = 0, width =
0, height = -5, depth = 1, precision = 49, xrender_format = 0x121, 
  a_mask = 0, r_mask = 1, g_mask = 0, b_mask = 0, embedded_source = {base =
{backend = 0x0, device = 0x7ffff226e310, type = 
    CAIRO_SURFACE_TYPE_IMAGE, content = 0, ref_count = {ref_count = 0}, status
= CAIRO_STATUS_SUCCESS, unique_id = 1, serial = 0, damage = 0x0, 
      _finishing = 0, finished = 0, is_clear = 0, has_font_options = 0,
owns_device = 0, user_data = {size = 0, num_elements = 0, element_size = 0, 
        elements = 0x0}, mime_data = {size = 0, num_elements = 1, element_size
= 0, elements = 0x7ffff220fc50 "ATI\211\374U\213\257\210"}, 
      device_transform = {xx = 0, yx = 0, xy = 102.00006103515625, yy =
6.519036401345942e-311, x0 = 0, y0 = 2.122016571860402e-314}, 
      device_transform_inverse = {xx = 6.9533310748676672e-310, yx = 0, xy =
1.0864618470523089e-310, yy = 0, x0 = 1.6975966327771585e-312, y0 = 
    4.0473857707314917e-320}, device_transform_observers = {next = 0x100000000,
prev = 0x200000000043}, x_resolution = 0, y_resolution = 
    1.4005172221013083e-312, x_fallback_resolution = 3.5414625493900552e-320,
y_fallback_resolution = 0, snapshot_of = 0x0, snapshot_detach = 0x0, 
      snapshots = {next = 0x251c1, prev = 0x1000}, snapshot = {next =
0x100000000, prev = 0x14000000004d}, font_options = {antialias = 
    CAIRO_ANTIALIAS_DEFAULT, subpixel_order = CAIRO_SUBPIXEL_ORDER_DEFAULT,
lcd_filter = CAIRO_LCD_FILTER_NONE, hint_style = 80, hint_metrics = 
    (unknown: 8192), round_glyph_positions = CAIRO_ROUND_GLYPH_POS_DEFAULT}},
picture = 4294967296, pixmap = 35184372088904, dpy = 0x0, filter = 5, 
    extend = 2, has_matrix = 1, has_component_alpha = 0}}
(gdb) p xsrc->base 
$8 = {backend = 0x7ffff62a6500 <cairo_xlib_shm_surface_backend>, device =
0xe8aa00, type = CAIRO_SURFACE_TYPE_IMAGE, content = 
    CAIRO_CONTENT_COLOR_ALPHA, ref_count = {ref_count = 1}, status =
CAIRO_STATUS_SUCCESS, unique_id = 605, serial = 0, damage = 0x0, _finishing = 
    0, finished = 0, is_clear = 1, has_font_options = 1, owns_device = 1,
user_data = {size = 0, num_elements = 0, element_size = 24, elements = 
    0x0}, mime_data = {size = 0, num_elements = 0, element_size = 24, elements
= 0x0}, device_transform = {xx = 1, yx = 0, xy = 0, yy = 1, x0 = 0, 
    y0 = 0}, device_transform_inverse = {xx = 1, yx = 0, xy = 0, yy = 1, x0 =
0, y0 = 0}, device_transform_observers = {next = 0xf5fc38, prev = 
    0xf5fc38}, x_resolution = 72, y_resolution = 72, x_fallback_resolution =
300, y_fallback_resolution = 300, snapshot_of = 0x0, snapshot_detach = 
    0x2000, snapshots = {next = 0xf5fc78, prev = 0xf5fc78}, snapshot = {next =
0x0, prev = 0xf00000001}, font_options = {antialias = 
    CAIRO_ANTIALIAS_SUBPIXEL, subpixel_order = CAIRO_SUBPIXEL_ORDER_RGB,
lcd_filter = CAIRO_LCD_FILTER_DEFAULT, hint_style = CAIRO_HINT_STYLE_FULL, 
    hint_metrics = CAIRO_HINT_METRICS_ON, round_glyph_positions =
CAIRO_ROUND_GLYPH_POS_ON}}
(gdb) l
1000        xsrc = (cairo_xlib_surface_t *)
1001            _cairo_surface_create_similar_scratch (&dst->base,
1002                               src->content,
1003                               upload.width,
1004                               upload.height);
1005        if (xsrc->base.type != CAIRO_SURFACE_TYPE_XLIB) {
1006        cairo_surface_destroy (src);
1007        cairo_surface_destroy (&xsrc->base);
1008        return None;
1009        }
(gdb) n
_cairo_xlib_source_create_for_pattern (_dst=0xf5b650, pattern=0x7fffffff9090,
is_mask=0, extents=<optimized out>, sample=<optimized out>, src_x=
    0x7fffffff87cc, src_y=0x7fffffff87d0) at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-xlib-source.c:1134
1134            return surface_source (dst, spattern, is_mask,
(gdb) 
1148    }
(gdb) 
composite_aligned_boxes (boxes=0x7fffffff8bf0, extents=0x7fffffff9010,
compositor=0x7ffff62a9a80 <compositor.16166>)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/cairo/cairo-1.12.14/src/cairo-traps-compositor.c:1276
1276        if (likely (src->status == CAIRO_STATUS_SUCCESS)) {



Initial backtrace with segfault is:

#0  composite_aligned_boxes (boxes=0x7fffffff8bd0, extents=0x7fffffff8ff0,
compositor=0x7ffff62a9b20 <compositor.16043>)
    at /tmp/buildd/cairo-1.12.14/src/cairo-traps-compositor.c:1276
#1  clip_and_composite_boxes (compositor=compositor at entry=0x7ffff62a9b20
<compositor.16043>, extents=extents at entry=0x7fffffff8ff0, boxes=boxes at entry=
    0x7fffffff8bd0) at
/tmp/buildd/cairo-1.12.14/src/cairo-traps-compositor.c:1766
#2  0x00007ffff600e6a7 in _cairo_traps_compositor_fill
(_compositor=0x7ffff62a9b20 <compositor.16043>, extents=0x7fffffff8ff0,
path=0x7fffffff9560, 
    fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001,
antialias=CAIRO_ANTIALIAS_DEFAULT)
    at /tmp/buildd/cairo-1.12.14/src/cairo-traps-compositor.c:2215
#3  0x00007ffff5fb7a5a in _cairo_compositor_fill (compositor=0x7ffff62a9b20
<compositor.16043>, surface=0xed9000, op=op at entry=CAIRO_OPERATOR_OVER, 
    source=source at entry=0x7fffffff9440, path=path at entry=0x7fffffff9560,
fill_rule=fill_rule at entry=CAIRO_FILL_RULE_WINDING, tolerance=
    0.10000000000000001, antialias=antialias at entry=CAIRO_ANTIALIAS_DEFAULT,
clip=clip at entry=0xe4e470)
    at /tmp/buildd/cairo-1.12.14/src/cairo-compositor.c:203
#4  0x00007ffff6028918 in _cairo_xlib_surface_fill (_surface=0xed9000,
op=CAIRO_OPERATOR_OVER, source=0x7fffffff9440, path=0x7fffffff9560, fill_rule=
    CAIRO_FILL_RULE_WINDING, tolerance=<optimized out>,
antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0xe4e470)
    at /tmp/buildd/cairo-1.12.14/src/cairo-xlib-surface.c:1645
#5  0x00007ffff5ffbb84 in _cairo_surface_fill (surface=0xed9000,
op=CAIRO_OPERATOR_OVER, source=0x7fffffff9440, path=0x7fffffff9560, fill_rule=
    CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001,
antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0xe4e470)
    at /tmp/buildd/cairo-1.12.14/src/cairo-surface.c:2238
#6  0x00007ffff60009f4 in _cairo_surface_offset_fill (surface=0xed9000, x=-277,
y=-1, op=op at entry=CAIRO_OPERATOR_OVER, source=0x7fffffff9440, 
    source at entry=0x7fffffff98f0, path=path at entry=0xdb9278,
fill_rule=fill_rule at entry=CAIRO_FILL_RULE_WINDING, tolerance=<optimized out>,
antialias=
    CAIRO_ANTIALIAS_DEFAULT, clip=clip at entry=0xe2f8e0) at
/tmp/buildd/cairo-1.12.14/src/cairo-surface-offset.c:239
#7  0x00007ffff6001a0e in _cairo_surface_subsurface_fill
(abstract_surface=0xed7920, op=CAIRO_OPERATOR_OVER, source=0x7fffffff98f0,
path=0xdb9278, 
    fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=<optimized out>,
antialias=<optimized out>, clip=0xe91560)
    at /tmp/buildd/cairo-1.12.14/src/cairo-surface-subsurface.c:165
#8  0x00007ffff5ffbb84 in _cairo_surface_fill (surface=0xed7920,
op=CAIRO_OPERATOR_OVER, source=0x7fffffff98f0, path=0xdb9278, fill_rule=
    CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001,
antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0xe91560)
    at /tmp/buildd/cairo-1.12.14/src/cairo-surface.c:2238
#9  0x00007ffff5fbf6d4 in _cairo_gstate_fill (gstate=0xed0300,
path=path at entry=0xdb9278) at /tmp/buildd/cairo-1.12.14/src/cairo-gstate.c:1308
#10 0x00007ffff5fb9324 in _cairo_default_context_fill (abstract_cr=0xdb8f10) at
/tmp/buildd/cairo-1.12.14/src/cairo-default-context.c:1053
#11 0x00007ffff5fb25e5 in cairo_fill (cr=0xdb8f10) at
/tmp/buildd/cairo-1.12.14/src/cairo.c:2201
#12 0x00007ffff7494d4f in gtk_border_image_render_slice (cr=0xdb8f10,
slice=0xf2ad20, slice_width=42098, slice_height=1, x=0, y=0, width=42099, 
    height=1, hrepeat=GTK_CSS_REPEAT_STYLE_NO_REPEAT,
vrepeat=GTK_CSS_REPEAT_STYLE_NO_REPEAT)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkborderimage.c:210
#13 0x00007ffff74954cc in _gtk_border_image_render (image=0x7fffffff9de0,
border_width=0x7fffffff9d50, cr=0xdb8f10, x=0, y=0, width=42099, height=28)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkborderimage.c:306
---Type <return> to continue, or q <return> to quit---
#14 0x00007ffff76ffc67 in render_frame_internal (engine=0x6eec00
[AdwaitaEngine], cr=0xdb8f10, x=0, y=0, width=42099, height=28, hidden_side=0, 
    junction=GTK_JUNCTION_NONE) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkthemingengine.c:1734
#15 0x00007ffff77001ce in gtk_theming_engine_render_frame (engine=0x6eec00
[AdwaitaEngine], cr=0xdb8f10, x=0, y=0, width=42099, height=28)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkthemingengine.c:1784
#16 0x00007ffff769f5f7 in gtk_render_frame (context=0xe2a960 [GtkStyleContext],
cr=0xdb8f10, x=0, y=0, width=42099, height=28)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkstylecontext.c:3958
#17 0x00007ffff74a8d1b in gtk_button_draw (widget=0xdd8740 [GtkButton],
cr=0xdb8f10)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkbutton.c:1724
#18 0x00007ffff75d9580 in _gtk_marshal_BOOLEAN__BOXEDv (closure=0x665cf0,
return_value=0x7fffffffa300, instance=0xdd8740, args=0x7fffffffa4a8, 
    marshal_data=0x7ffff74a8abc <gtk_button_draw>, n_params=1,
param_types=0x665d60) at gtkmarshalers.c:130
#19 0x00007ffff777c8bc in gtk_widget_draw_marshallerv (closure=0x665cf0,
return_value=0x7fffffffa300, instance=0xdd8740, args=0x7fffffffa4a8, 
    marshal_data=0x7ffff74a8abc <gtk_button_draw>, n_params=1,
param_types=0x665d60)
    at /home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkwidget.c:906
#20 0x00007ffff5d49484 in g_type_class_meta_marshalv (closure=0x665cf0,
return_value=0x7fffffffa300, instance=0xdd8740, args=0x7fffffffa4a8, 
    marshal_data=0x120, n_params=1, param_types=0x665d60) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gclosure.c:997
#21 0x00007ffff5d49047 in _g_closure_invoke_va (closure=0x665cf0,
return_value=0x7fffffffa300, instance=0xdd8740, args=0x7fffffffa4a8,
n_params=1, 
    param_types=0x665d60) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gclosure.c:840
#22 0x00007ffff5d64f82 in g_signal_emit_valist (instance=0xdd8740,
signal_id=34, detail=0, var_args=0x7fffffffa4a8)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3234
#23 0x00007ffff5d66171 in g_signal_emit (instance=0xdd8740, signal_id=34,
detail=0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3384
#24 0x00007ffff7786443 in _gtk_widget_draw_internal (widget=0xdd8740
[GtkButton], cr=0xdb8f10, clip_to_size=1)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkwidget.c:6173
#25 0x00007ffff74fcdd6 in gtk_container_propagate_draw (container=0xe304e0
[DConfKeyView], child=0xdd8740 [GtkButton], cr=0xdb8f10)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkcontainer.c:3375
#26 0x00007ffff7750ad8 in gtk_tree_view_draw (widget=0xe304e0 [DConfKeyView],
cr=0xdb8f10)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtktreeview.c:5427
#27 0x00007ffff75d9580 in _gtk_marshal_BOOLEAN__BOXEDv (closure=0x665cf0,
return_value=0x7fffffffaa40, instance=0xe304e0, args=0x7fffffffabe8, 
    marshal_data=0x7ffff77508c6 <gtk_tree_view_draw>, n_params=1,
param_types=0x665d60) at gtkmarshalers.c:130
#28 0x00007ffff777c8bc in gtk_widget_draw_marshallerv (closure=0x665cf0,
return_value=0x7fffffffaa40, instance=0xe304e0, args=0x7fffffffabe8, 
    marshal_data=0x7ffff77508c6 <gtk_tree_view_draw>, n_params=1,
param_types=0x665d60)
    at /home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkwidget.c:906
#29 0x00007ffff5d49484 in g_type_class_meta_marshalv (closure=0x665cf0,
return_value=0x7fffffffaa40, instance=0xe304e0, args=0x7fffffffabe8, 
    marshal_data=0x120, n_params=1, param_types=0x665d60) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gclosure.c:997
---Type <return> to continue, or q <return> to quit---
#30 0x00007ffff5d49047 in _g_closure_invoke_va (closure=0x665cf0,
return_value=0x7fffffffaa40, instance=0xe304e0, args=0x7fffffffabe8,
n_params=1, 
    param_types=0x665d60) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gclosure.c:840
#31 0x00007ffff5d64f82 in g_signal_emit_valist (instance=0xe304e0,
signal_id=34, detail=0, var_args=0x7fffffffabe8)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3234
#32 0x00007ffff5d66171 in g_signal_emit (instance=0xe304e0, signal_id=34,
detail=0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3384
#33 0x00007ffff7786443 in _gtk_widget_draw_internal (widget=0xe304e0
[DConfKeyView], cr=0xdb8f10, clip_to_size=1)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkwidget.c:6173
#34 0x00007ffff77870fe in gtk_widget_send_expose (widget=0xe304e0
[DConfKeyView], event=0x7fffffffae60)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkwidget.c:6553
#35 0x00007ffff75d7a3c in gtk_main_do_event (event=0x7fffffffae60) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gtk/gtkmain.c:1619
#36 0x00007ffff713932e in _gdk_event_emit (event=0x7fffffffae60) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkevents.c:69
#37 0x00007ffff714c090 in _gdk_window_process_updates_recurse (window=0xe6cbf0
[GdkX11Window], expose_region=0xe6f9d0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4006
#38 0x00007ffff714c1e3 in _gdk_window_process_updates_recurse (window=0xe6c990
[GdkX11Window], expose_region=0xe6f9d0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4051
#39 0x00007ffff714c1e3 in _gdk_window_process_updates_recurse (window=0xe6c860
[GdkX11Window], expose_region=0xe6f9d0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4051
#40 0x00007ffff714c1e3 in _gdk_window_process_updates_recurse (window=0xe6c140
[GdkX11Window], expose_region=0xe6f9d0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4051
#41 0x00007ffff714c1e3 in _gdk_window_process_updates_recurse (window=0x6a9c00
[GdkX11Window], expose_region=0xe6f9d0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4051
#42 0x00007ffff714c1e3 in _gdk_window_process_updates_recurse (window=0x6a9ad0
[GdkX11Window], expose_region=0xe6f9d0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4051
#43 0x00007ffff718d247 in gdk_x11_window_process_updates_recurse
(window=0x6a9ad0 [GdkX11Window], region=0xe6f9d0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/x11/gdkwindow-x11.c:5202
#44 0x00007ffff714c4b3 in gdk_window_process_updates_internal (window=0x6a9ad0
[GdkX11Window])
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4194
#45 0x00007ffff714c8e4 in gdk_window_process_updates_with_mode (window=0x6a9ad0
[GdkX11Window], recurse_mode=2)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:4374
#46 0x00007ffff715830d in gdk_window_paint_on_clock (clock=0x6b83c0
[GdkFrameClockIdle], data=0x6a9ad0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkwindow.c:11626
#47 0x00007ffff5d4be23 in g_cclosure_marshal_VOID__VOIDv (closure=0xe6a420,
return_value=0x0, instance=0x6b83c0, args=0x7fffffffb7c8, marshal_data=
    0x0, n_params=0, param_types=0x0) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gmarshal.c:115
---Type <return> to continue, or q <return> to quit---
#48 0x00007ffff5d49047 in _g_closure_invoke_va (closure=0xe6a420,
return_value=0x0, instance=0x6b83c0, args=0x7fffffffb7c8, n_params=0,
param_types=
    0x0) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gclosure.c:840
#49 0x00007ffff5d64f82 in g_signal_emit_valist (instance=0x6b83c0,
signal_id=154, detail=0, var_args=0x7fffffffb7c8)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3234
#50 0x00007ffff5d662dd in g_signal_emit_by_name (instance=0x6b83c0,
detailed_signal=0x7ffff7194aba "paint")
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gobject/gsignal.c:3424
#51 0x00007ffff71405c0 in gdk_frame_clock_paint_idle (data=0x6b83c0)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdkframeclockidle.c:419
#52 0x00007ffff712ddf4 in gdk_threads_dispatch (data=0x7ca420) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/gtk+/gdk/gdk.c:806
#53 0x00007ffff5a3d81a in g_timeout_dispatch (source=0xec7810,
callback=0x7ffff712ddaf <gdk_threads_dispatch>, user_data=0x7ca420)
    at /home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/glib/gmain.c:4413
#54 0x00007ffff5a3bae4 in g_main_dispatch (context=0x64ac00) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/glib/gmain.c:3054
#55 0x00007ffff5a3c83b in g_main_context_dispatch (context=0x64ac00) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/glib/gmain.c:3630
#56 0x00007ffff5a3ca2d in g_main_context_iterate (context=0x64ac00, block=1,
dispatch=1, self=0x63d640)
    at /home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/glib/gmain.c:3701
#57 0x00007ffff5a3caf1 in g_main_context_iteration (context=0x64ac00,
may_block=1)
    at /home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/glib/gmain.c:3762
#58 0x00007ffff6c071ea in g_application_run (application=0x645100
[ConfigurationEditor], argc=1, argv=0x7fffffffbc88)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/glib/gio/gapplication.c:1624
#59 0x000000000040d63e in configuration_editor_main (args=0x7fffffffbc88,
args_length1=1)
    at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/dconf/editor/dconf-editor.c:2019
#60 0x000000000040d68c in main (argc=1, argv=0x7fffffffbc88) at
/home/prahal/Projects/Devel/Gnome/jhbuild/gnome/dconf/editor/dconf-editor.c:2028

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