Issue #1545463: Global variables caught in reference cycles are now garbage-collected at shutdown.

2 files changed, 9 insertions, 4 deletions

diff --git a/Python/import.c b/Python/import.c
index b77eda106d..cd4fb788a1 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -403,6 +403,14 @@ PyImport_Cleanup(void)
         }
     }
 
+    /* Collect garbage remaining after deleting the modules. Mostly
+       reference cycles created by classes. */
+    PyGC_Collect();
+
+    /* Dump GC stats before it's too late, since it uses the warnings
+       machinery. */
+    _PyGC_DumpShutdownStats();
+
     /* Next, delete sys and builtins (in that order) */
     value = PyDict_GetItemString(modules, "sys");
     if (value != NULL && PyModule_Check(value)) {
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 96b0988ec7..02a4329950 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -544,10 +544,6 @@ Py_Finalize(void)
     while (PyGC_Collect() > 0)
         /* nothing */;
 #endif
-    /* We run this while most interpreter state is still alive, so that
-       debug information can be printed out */
-    _PyGC_Fini();
-
     /* Destroy all modules */
     PyImport_Cleanup();
 
@@ -628,6 +624,7 @@ Py_Finalize(void)
     PyFloat_Fini();
     PyDict_Fini();
     PySlice_Fini();
+    _PyGC_Fini();
 
     /* Cleanup Unicode implementation */
     _PyUnicode_Fini();