python3.6-linux-16-byte-align-fix.patch

--- Include/objimpl.h
+++ Include/objimpl.h
@@ -250,7 +250,7 @@
         union _gc_head *gc_prev;
         Py_ssize_t gc_refs;
     } gc;
-    double dummy;  /* force worst-case alignment */
+    long double dummy;  /* force worst-case alignment */
 } PyGC_Head;

 extern PyGC_Head *_PyGC_generation0;
--- Objects/obmalloc.c
+++ Objects/obmalloc.c
@@ -643,8 +643,8 @@
  *
  * You shouldn't change this unless you know what you are doing.
  */
-#define ALIGNMENT               8               /* must be 2^N */
-#define ALIGNMENT_SHIFT         3
+#define ALIGNMENT               16               /* must be 2^N */
+#define ALIGNMENT_SHIFT         4

 /* Return the number of bytes in size class I, as a uint. */
 #define INDEX2SIZE(I) (((uint)(I) + 1) << ALIGNMENT_SHIFT)