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GNOME Settings 3.26 is crashing every time a VPN connection changed its state. After some digging, a debug message was put on dispose, and this issue was found: libnm-Message: Object 0x55555633c070 disposed libnm-Message: Object 0x55555633c730 disposed libnm-Message: Object 0x55555633eae0 disposed libnm-Message: Object 0x555556340a80 disposed Thread 1 "gnome-control-c" received signal SIGSEGV, Segmentation fault. g_type_check_instance_cast (type_instance=type_instance@entry=0x55555633c070, iface_type=93825006537856) at /.../glib/gobject/gtype.c:4057 4057 node = lookup_type_node_I (type_instance->g_class->g_type); (gdb) bt NetworkManager is calling callbacks on disposed objects, which leads to crashes in clients (e.g. GNOME Settings). Fix this issue by disconnecting signal handlers when the objects are disposed. Patch originally by Georges Basile Stavracas Neto <georges.stavracas@gmail.com> https://bugzilla.gnome.org/show_bug.cgi?id=787893
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