#0  0x00007f090bed36ab in ?? () from /tmp/apport_sandbox_zl5oKV/usr/lib/x86_64-linux-gnu/libcups.so.2
#1  0x000055c2dce88cec in renew_subscription (data=0x55c2deab09f0, data@entry=<error reading variable: value has been optimized out>) at gsd-print-notifications-manager.c:1113
  1108:                 "job-state",
  1109:                 "printer-added",
  1110:                 "printer-deleted",
  1111:                 "printer-state-changed"};
  1112: 
  1113:         if ((http = httpConnectEncrypt (cupsServer (), ippPort (),
  1114:                                         cupsEncryption ())) == NULL) {
  1115:                 g_debug ("Connection to CUPS server \'%s\' failed.", cupsServer ());
  1116:         } else {
  1117:                 if (manager->priv->subscription_id >= 0) {
  1118:                         request = ippNewRequest (IPP_RENEW_SUBSCRIPTION);
#2  0x00007f090a7a1d03 in g_timeout_dispatch (source=0x55c2deae0100, callback=<optimized out>, user_data=<optimized out>) at ../../../../glib/gmain.c:4715
  [Error: gmain.c was not found in source tree]
#3  0x00007f090a7a128a in g_main_dispatch (context=0x55c2dea850e0) at ../../../../glib/gmain.c:3234
  [Error: gmain.c was not found in source tree]
#4  g_main_context_dispatch (context=context@entry=0x55c2dea850e0) at ../../../../glib/gmain.c:3899
  [Error: gmain.c was not found in source tree]
#5  0x00007f090a7a1640 in g_main_context_iterate (context=0x55c2dea850e0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../../glib/gmain.c:3972
  [Error: gmain.c was not found in source tree]
#6  0x00007f090a7a1962 in g_main_loop_run (loop=0x55c2deaccf20) at ../../../../glib/gmain.c:4168
  [Error: gmain.c was not found in source tree]
#7  0x00007f090b58c445 in gtk_main () at ././gtk/gtkmain.c:1312
  [Error: gtkmain.c was not found in source tree]
#8  0x000055c2dce884ca in main (argc=<optimized out>, argv=<optimized out>) at ../../plugins/common/daemon-skeleton-gtk.h:211
  206: 			g_error_free (error);
  207: 			exit (1);
  208: 		}
  209: 	}
  210: 
  211:         gtk_main ();
  212: 
  213: 	if (should_run ())
  214: 		STOP (manager);
  215:         g_object_unref (manager);
  216: