gh-71587: Drop local reference cache to _strptime module in _datetime (gh-120224)

The _strptime module object was cached in a static local variable (in the datetime.strptime() implementation).  That's a problem when it crosses isolation boundaries, such as reinitializing the runtme or between interpreters.  This change fixes the problem by dropping the static variable, instead always relying on the normal sys.modules cache (via PyImport_Import()).

Include/internal/pycore_global_objects_fini_generated.h

@@ -777,6 +777,7 @@ _PyStaticObjects_CheckRefcnt(PyInterpreterState *interp) {
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(_showwarnmsg));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(_shutdown));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(_slotnames));
+    _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(_strptime));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(_strptime_datetime));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(_swappedbytes_));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(_type_));

Include/internal/pycore_global_strings.h

@@ -266,6 +266,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(_showwarnmsg)
         STRUCT_FOR_ID(_shutdown)
         STRUCT_FOR_ID(_slotnames)
+        STRUCT_FOR_ID(_strptime)
         STRUCT_FOR_ID(_strptime_datetime)
         STRUCT_FOR_ID(_swappedbytes_)
         STRUCT_FOR_ID(_type_)

Include/internal/pycore_runtime_init_generated.h

@@ -775,6 +775,7 @@ extern "C" {
     INIT_ID(_showwarnmsg), \
     INIT_ID(_shutdown), \
     INIT_ID(_slotnames), \
+    INIT_ID(_strptime), \
     INIT_ID(_strptime_datetime), \
     INIT_ID(_swappedbytes_), \
     INIT_ID(_type_), \

Include/internal/pycore_unicodeobject_generated.h

@@ -636,6 +636,9 @@ _PyUnicode_InitStaticStrings(PyInterpreterState *interp) {
     string = &_Py_ID(_slotnames);
     assert(_PyUnicode_CheckConsistency(string, 1));
     _PyUnicode_InternInPlace(interp, &string);
+    string = &_Py_ID(_strptime);
+    assert(_PyUnicode_CheckConsistency(string, 1));
+    _PyUnicode_InternInPlace(interp, &string);
     string = &_Py_ID(_strptime_datetime);
     assert(_PyUnicode_CheckConsistency(string, 1));
     _PyUnicode_InternInPlace(interp, &string);

Lib/test/test_embed.py

@@ -404,6 +404,15 @@ class EmbeddingTests(EmbeddingTestsMixin, unittest.TestCase):
         out, err = self.run_embedded_interpreter("test_repeated_init_exec", code)
         self.assertEqual(out, '9\n' * INIT_LOOPS)
 
+    def test_datetime_reset_strptime(self):
+        code = (
+            "import datetime;"
+            "d = datetime.datetime.strptime('2000-01-01', '%Y-%m-%d');"
+            "print(d.strftime('%Y%m%d'))"
+        )
+        out, err = self.run_embedded_interpreter("test_repeated_init_exec", code)
+        self.assertEqual(out, '20000101\n' * INIT_LOOPS)
+
 
 @unittest.skipIf(_testinternalcapi is None, "requires _testinternalcapi")
 class InitConfigTests(EmbeddingTestsMixin, unittest.TestCase):

Misc/NEWS.d/next/Library/2024-06-07-11-23-31.gh-issue-71587.IjFajE.rst

@@ -0,0 +1,2 @@
+Fix crash in C version of :meth:`datetime.datetime.strptime` when called again
+on the restarted interpreter.

Modules/_datetimemodule.c

@@ -5514,19 +5514,19 @@ datetime_utcfromtimestamp(PyObject *cls, PyObject *args)
 static PyObject *
 datetime_strptime(PyObject *cls, PyObject *args)
 {
-    static PyObject *module = NULL;
-    PyObject *string, *format;
+    PyObject *string, *format, *result;
 
     if (!PyArg_ParseTuple(args, "UU:strptime", &string, &format))
         return NULL;
 
+    PyObject *module = PyImport_Import(&_Py_ID(_strptime));
     if (module == NULL) {
-        module = PyImport_ImportModule("_strptime");
-        if (module == NULL)
-            return NULL;
+        return NULL;
     }
-    return PyObject_CallMethodObjArgs(module, &_Py_ID(_strptime_datetime),
-                                         cls, string, format, NULL);
+    result = PyObject_CallMethodObjArgs(module, &_Py_ID(_strptime_datetime),
+                                        cls, string, format, NULL);
+    Py_DECREF(module);
+    return result;
 }
 
 /* Return new datetime from date/datetime and time arguments. */

Tools/c-analyzer/cpython/globals-to-fix.tsv

@@ -393,7 +393,6 @@ Modules/xxmodule.c	-	ErrorObject	-
 
 ## initialized once
 Modules/_cursesmodule.c	-	ModDict	-
-Modules/_datetimemodule.c	datetime_strptime	module	-
 
 ## state
 Modules/_datetimemodule.c	-	_datetime_global_state	-