it should be enough to restart tracking the object at the end of tp_dealloc()...

it should be enough to restart tracking the object at the end of tp_dealloc() only if there really is a base type that might rely on it

--HG--
extra : rebase_source : 8a20a41f35f9b5d1aaa2a916b52403bd0cb145fc

Cython/Compiler/ModuleNode.py

@@ -1158,12 +1158,12 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
             code.put_xdecref_memoryviewslice("p->%s" % entry.cname,
                                              have_gil=True)
 
+        if base_type:
             # The base class deallocator probably expects this to be tracked, so
             # undo the untracking above.
             if scope.needs_gc():
                 code.putln("PyObject_GC_Track(o);")
 
-        if base_type:
             tp_dealloc = TypeSlots.get_base_slot_function(scope, tp_slot)
             if tp_dealloc is not None:
                 code.putln("%s(o);" % tp_dealloc)