#0  malloc_printerr (ar_ptr=0x657565, ptr=<optimized out>, str=0x7f9f9351bdac "free(): invalid size", action=3) at malloc.c:4994
  [Error: malloc.c was not found in source tree]
#1  _int_free (av=0x657565, p=<optimized out>, have_lock=0) at malloc.c:3868
  [Error: malloc.c was not found in source tree]
#2  0x00007f9f93411c5c in __GI___libc_free (mem=<optimized out>) at malloc.c:2969
  [Error: malloc.c was not found in source tree]
#3  0x00007f9f741c35d8 in update_alert_model (id=0x7f9f741d60a6 "__default", chooser=0x26251c0) at gvc-sound-theme-chooser.c:310
  305: 
  306:                         selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (chooser->priv->treeview));
  307:                         gtk_tree_selection_select_iter (selection, &iter);
  308:                 }
  309: 
  310:                 g_free (this_id);
  311:         } while (gtk_tree_model_iter_next (model, &iter));
  312: }
  313: 
  314: static void
  315: save_theme_name (GvcSoundThemeChooser *chooser,
#4  update_alert (chooser=0x26251c0, alert_id=<optimized out>) at gvc-sound-theme-chooser.c:441
  436:                 if (is_custom) {
  437:                         save_theme_name (chooser, chooser->priv->current_parent);
  438:                 }
  439:         }
  440: 
  441:         update_alert_model (chooser, alert_id);
  442: }
  443: 
  444: static void
  445: play_preview_for_id (GvcSoundThemeChooser *chooser,
  446:                      const char           *id)
#5  0x00007f9f93c98a5a in g_cclosure_marshal_VOID__STRINGv () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6  0x00007f9f93c961d4 in _g_closure_invoke_va () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#7  0x00007f9f93cb09a6 in g_signal_emit_valist () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8  0x00007f9f93cb108f in g_signal_emit () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#9  0x00007f9f93f9c0cc in g_settings_real_change_event () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#10 0x00007f9f8f006e40 in ffi_call_unix64 () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libffi.so.6
#11 0x00007f9f8f0068ab in ffi_call () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libffi.so.6
#12 0x00007f9f93c96cf5 in g_cclosure_marshal_generic_va () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007f9f93c961d4 in _g_closure_invoke_va () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x00007f9f93cb04b8 in g_signal_emit_valist () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#15 0x00007f9f93cb108f in g_signal_emit () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#16 0x00007f9f93f9c838 in settings_backend_path_changed () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#17 0x00007f9f93f9744a in g_settings_backend_invoke_closure () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#18 0x00007f9f939befda in g_main_context_dispatch () from /tmp/apport_sandbox_LgIfd4/lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f9f939bf380 in g_main_context_iterate.isra () from /tmp/apport_sandbox_LgIfd4/lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f9f939bf42c in g_main_context_iteration () from /tmp/apport_sandbox_LgIfd4/lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f9f93f86ccd in g_application_run () from /tmp/apport_sandbox_LgIfd4/usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#22 0x0000000000407503 in main (argc=2, argv=0x7ffcab793af8) at control-center.c:317
  312:   g_signal_connect (application, "startup",
  313:                     G_CALLBACK (application_startup_cb), shell);
  314:   g_signal_connect (application, "command-line",
  315:                     G_CALLBACK (application_command_line_cb), shell);
  316: 
  317:   status = g_application_run (G_APPLICATION (application), argc, argv);
  318: 
  319:   g_object_unref (application);
  320: 
  321:   return status;
  322: }