bug#49441: xfce4-power-manager segfaults randomly

bug#49441: xfce4-power-manager segfaults randomly

[Nathan Dehnel]

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Using v4.16.0. Attached is a backtrace. I have a coredump, but it's
too large to attach to an email.

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#0  0x00007f995c4c75bc in gtk_widget_dispose ()
   from /gnu/store/nd2i0wfhx2wsdn3di573wl7kagg6pm9s-gtk+-3.24.24/lib/libgtk-3.so.0
#1  0x00007f995baee8a3 in g_object_unref ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#2  0x000000000041ea61 in battery_device_remove_pix ()
#3  0x000000000041f37d in power_manager_button_update_device_icon_and_details ()
#4  0x00007f995bae9b3d in g_closure_invoke ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#5  0x00007f995bafccce in signal_emit_unlocked_R ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#6  0x00007f995bb055b5 in g_signal_emit_valist ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#7  0x00007f995bb05f72 in g_signal_emit ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#8  0x00007f995baeddd4 in g_object_dispatch_properties_changed ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#9  0x00007f995baf0229 in g_object_notify ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#10 0x00007f995bae9b3d in g_closure_invoke ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#11 0x00007f995bafccce in signal_emit_unlocked_R ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#12 0x00007f995bb055b5 in g_signal_emit_valist ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#13 0x00007f995bb05f72 in g_signal_emit ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#14 0x00007f995baeddd4 in g_object_dispatch_properties_changed ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#15 0x00007f995baf0229 in g_object_notify ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#16 0x00007f995bb4b88c in up_exported_device_proxy_g_properties_changed ()
   from /gnu/store/f8xgyiss6frzswh561r9718diwr4k36y-upower-0.99.11/lib/libupower-glib.so.3
#17 0x00007f995bae9b3d in g_closure_invoke ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#18 0x00007f995bafc728 in signal_emit_unlocked_R ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#19 0x00007f995bb055b5 in g_signal_emit_valist ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#20 0x00007f995bb05f72 in g_signal_emit ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
#21 0x00007f995bc6c8f1 in on_properties_changed ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgio-2.0.so.0
#22 0x00007f995bc5bc54 in emit_signal_instance_in_idle_cb ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgio-2.0.so.0
#23 0x00007f995ba00f14 in g_main_context_dispatch ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libglib-2.0.so.0
#24 0x00007f995ba01288 in g_main_context_iterate.isra ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libglib-2.0.so.0
#25 0x00007f995ba01542 in g_main_loop_run ()
   from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libglib-2.0.so.0
#26 0x00007f995c389685 in gtk_main ()
   from /gnu/store/nd2i0wfhx2wsdn3di573wl7kagg6pm9s-gtk+-3.24.24/lib/libgtk-3.so.0
#27 0x000000000040bff5 in xfpm_start ()
#28 0x000000000040c780 in main ()

bug#49441: xfce4-power-manager segfaults randomly

[Michael Rohleder]

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Hello Nathan!

Thank you for the report and the backtrace!

Nathan Dehnel <ncdehnel@gmail.com> writes:
> Using v4.16.0. Attached is a backtrace. I have a coredump, but it's
> too large to attach to an email.
>
> #0  0x00007f995c4c75bc in gtk_widget_dispose ()
>    from /gnu/store/nd2i0wfhx2wsdn3di573wl7kagg6pm9s-gtk+-3.24.24/lib/libgtk-3.so.0
> #1  0x00007f995baee8a3 in g_object_unref ()
>    from /gnu/store/jsqxxnaj5p8a22mrsvl679gi7jl26z4j-glib-2.62.6/lib/libgobject-2.0.so.0
> #2  0x000000000041ea61 in battery_device_remove_pix ()
> #3  0x000000000041f37d in power_manager_button_update_device_icon_and_details ()

looks like it is crashing here:
(`guix build -S xfce4-power-manager`/panel-plugins/power-manager-plugin/power-manager-button.c:607)

/* This function unrefs the pix and img from the battery device and
 * disconnects the expose-event callback on the img.
 */
static void
battery_device_remove_pix (BatteryDevice *battery_device)
{
  TRACE("entering");

  if (battery_device == NULL)
    return;

  if (G_IS_OBJECT (battery_device->pix))
  {
    if (GTK_IS_WIDGET (battery_device->img))
    {
      if (battery_device->expose_signal_id != 0)
      {
          g_signal_handler_disconnect (battery_device->img, battery_device->expose_signal_id);
          battery_device->expose_signal_id = 0;
      }
      g_object_unref (battery_device->img);
      battery_device->img = NULL;
    }
    g_object_unref (battery_device->pix);
    battery_device->pix = NULL;
  }
}

I wonder how that can happen and so far I was not able to reproduce
this.

Do you get something on the console/stdout if you start
xfce4-power-manager on the console?

If that happens only sometimes: Maybe is it after you change something
at runtime, maybe changeing a battery or so?


-- 
You are not supposed to start Emacs more than once in a lifetime, so
the startup time shouldn't matter at all.
      Eli Zaretskii in help-gnu-emacs

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