[Reland] Fix crash on exit with debug Python 3

Crash happens because of an use-after-free error. This is a bandaid
fix transforming the crash into a memory leak. Proper fix will
require more investigation and time.

The commit was missing in 5.9 branch after repo merge.

Task-number: PYSIDE-488
Change-Id: I56358573ca60d6f18fd85fbd7eb3eb0da8fbf163
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 6 insertions, 1 deletions

diff --git a/sources/shiboken2/libshiboken/sbkenum.cpp b/sources/shiboken2/libshiboken/sbkenum.cpp
index 0902077ed..009d9ab2f 100644
--- a/sources/shiboken2/libshiboken/sbkenum.cpp
+++ b/sources/shiboken2/libshiboken/sbkenum.cpp
@@ -487,7 +487,12 @@ bool createGlobalEnumItem(PyTypeObject* enumType, PyObject* module, const char*
     if (enumItem) {
         if (PyModule_AddObject(module, itemName, enumItem) < 0)
             return false;
-        Py_DECREF(enumItem);
+        // @TODO This Py_DECREF causes crashes on exit with a debug Python interpreter, essentially
+        // causing a use-after-free in the GC. This is now commented out to cause a memory leak
+        // instead of a crash. Proper memory management of Enum types and items should be
+        // implemented. See PYSIDE-488. This will require proper allocation and deallocation of
+        // the underlying Enum PyHeapType, which is currently just deallocated at application exit.
+        // Py_DECREF(enumItem);
         return true;
     }
     return false;