--- Modules/posixmodule.c
+++ Modules/posixmodule.c
@@ -13998,6 +13998,9 @@
 };
 
 static int
+#if defined __clang__
+__attribute__((no_sanitize("shift-base"))) // MFD_HUGE_16GB in /usr/include/linux/memfd.h
+#endif
 all_ins(PyObject *m)
 {
 #ifdef F_OK
--- Objects/dictobject.c
+++ Objects/dictobject.c
@@ -2105,7 +2105,7 @@
             if (unicode) { // combined unicode -> combined unicode
                 PyDictUnicodeEntry *newentries = DK_UNICODE_ENTRIES(newkeys);
                 if (oldkeys->dk_nentries == numentries && mp->ma_keys->dk_kind == DICT_KEYS_UNICODE) {
-                    memcpy(newentries, oldentries, numentries * sizeof(PyDictUnicodeEntry));
+                    memcpy(newentries, (void *) oldentries, numentries * sizeof(PyDictUnicodeEntry));
                 }
                 else {
                     PyDictUnicodeEntry *ep = oldentries;
--- Objects/listobject.c
+++ Objects/listobject.c
@@ -539,7 +539,7 @@
         dest[i] = Py_NewRef(v);
     }
     src = b->ob_item;
-    dest = np->ob_item + Py_SIZE(a);
+    dest = Py_SIZE(a) == 0 ? np->ob_item : np->ob_item + Py_SIZE(a);
     for (i = 0; i < Py_SIZE(b); i++) {
         PyObject *v = src[i];
         dest[i] = Py_NewRef(v);
@@ -1325,7 +1325,7 @@
     Py_ssize_t setpos = 0;
     Py_hash_t hash;
     PyObject *key;
-    PyObject **dest = self->ob_item + m;
+    PyObject **dest = m == 0 ? self->ob_item : self->ob_item + m;
     while (_PySet_NextEntryRef((PyObject *)other, &setpos, &key, &hash)) {
         FT_ATOMIC_STORE_PTR_RELEASE(*dest, key);
         dest++;
@@ -1344,7 +1344,7 @@
         return -1;
     }
 
-    PyObject **dest = self->ob_item + m;
+    PyObject **dest = m == 0 ? self->ob_item : self->ob_item + m;
     Py_ssize_t pos = 0;
     PyObject *keyvalue[2];
     while (_PyDict_Next((PyObject *)dict, &pos, &keyvalue[0], &keyvalue[1], NULL)) {
@@ -1367,7 +1367,7 @@
         return -1;
     }
 
-    PyObject **dest = self->ob_item + m;
+    PyObject **dest = m == 0 ? self->ob_item : self->ob_item + m;
     Py_ssize_t pos = 0;
     Py_ssize_t i = 0;
     PyObject *key, *value;
--- Parser/lexer/buffer.c
+++ Parser/lexer/buffer.c
@@ -29,8 +29,8 @@
 
     for (index = tok->tok_mode_stack_index; index >= 0; --index) {
         mode = &(tok->tok_mode_stack[index]);
-        mode->f_string_start = mode->f_string_start_offset < 0 ? NULL : tok->buf + mode->f_string_start_offset;
-        mode->f_string_multi_line_start = mode->f_string_multi_line_start_offset < 0 ? NULL : tok->buf + mode->f_string_multi_line_start_offset;
+        mode->f_string_start = mode->f_string_start_offset < 0 ? NULL : (char *) (((intptr_t) tok->buf) + mode->f_string_start_offset);
+        mode->f_string_multi_line_start = mode->f_string_multi_line_start_offset < 0 ? NULL : (char *) (((intptr_t) tok->buf) + mode->f_string_multi_line_start_offset);
         mode->last_expr_start = mode->last_expr_start_offset < 0
             ? NULL : tok->buf + mode->last_expr_start_offset;
     }