Issue #14184: Increase the default stack size for secondary threads on

Mac OS X to prevent interpreter crashes when compiled on 10.7.

Misc/NEWS

@@ -22,6 +22,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #14184: Increase the default stack size for secondary threads on
+  Mac OS X to avoid interpreter crashes when using threads on 10.7.
+
 - Issue #10543: Fix unittest test discovery with Jython bytecode files.
 
 - Issue #14252: Fix subprocess.Popen.terminate() to not raise an error under

Python/thread_pthread.h

@@ -19,14 +19,18 @@
 #define THREAD_STACK_SIZE       0       /* use default stack size */
 #endif
 
-#if (defined(__APPLE__) || defined(__FreeBSD__)) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
-   /* The default stack size for new threads on OSX is small enough that
+/* The default stack size for new threads on OSX and BSD is small enough that
  * we'll get hard crashes instead of 'maximum recursion depth exceeded'
  * exceptions.
  *
-    * The default stack size below is the minimal stack size where a
-    * simple recursive function doesn't cause a hard crash.
+ * The default stack sizes below are the empirically determined minimal stack
+ * sizes where a simple recursive function doesn't cause a hard crash.
  */
+#if defined(__APPLE__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
+#undef  THREAD_STACK_SIZE
+#define THREAD_STACK_SIZE       0x500000
+#endif
+#if defined(__FreeBSD__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
 #undef  THREAD_STACK_SIZE
 #define THREAD_STACK_SIZE       0x400000
 #endif