bpo-18049: Sync thread stack size to main thread size on macOS (GH-14748)

miss-islington · ronaldoussoren · web-flow · commit 8399641c34d8 · 2019-08-01T07:38:57.000-07:00
This changeset increases the default size of the stack for threads on macOS to the size of the stack of the main thread and reenables the relevant recursion test. (cherry picked from commit 1a057ba) Co-authored-by: Ronald Oussoren <ronaldoussoren@mac.com>
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
@@ -1049,8 +1049,6 @@ def test_releasing_unacquired_lock(self):
         lock = threading.Lock()
         self.assertRaises(RuntimeError, lock.release)
 
-    @unittest.skipUnless(sys.platform == 'darwin' and test.support.python_is_optimized(),
-                         'test macosx problem')
     def test_recursion_limit(self):
         # Issue 9670
         # test that excessive recursion within a non-main thread causes
diff --git a/Misc/NEWS.d/next/macOS/2019-07-13-15-58-18.bpo-18049.MklhQQ.rst b/Misc/NEWS.d/next/macOS/2019-07-13-15-58-18.bpo-18049.MklhQQ.rst
@@ -0,0 +1,3 @@
+Increase the default stack size of threads from 5MB to 16MB on macOS, to
+match the stack size of the main thread. This avoids crashes on deep recursion
+in threads.
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
@@ -40,7 +40,8 @@
  */
 #if defined(__APPLE__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
 #undef  THREAD_STACK_SIZE
-#define THREAD_STACK_SIZE       0x500000
+/* Note: This matches the value of -Wl,-stack_size in configure.ac */
+#define THREAD_STACK_SIZE       0x1000000
 #endif
 #if defined(__FreeBSD__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
 #undef  THREAD_STACK_SIZE
diff --git a/configure b/configure
@@ -9542,6 +9542,8 @@ then
 		# Issue #18075: the default maximum stack size (8MBytes) is too
 		# small for the default recursion limit. Increase the stack size
 		# to ensure that tests don't crash
+		# Note: This matches the value of THREAD_STACK_SIZE in
+		# thread_pthread.h
 		LINKFORSHARED="-Wl,-stack_size,1000000 $LINKFORSHARED"
 
 		if test "$enable_framework"
diff --git a/configure.ac b/configure.ac
@@ -2694,6 +2694,8 @@ then
 		# Issue #18075: the default maximum stack size (8MBytes) is too
 		# small for the default recursion limit. Increase the stack size
 		# to ensure that tests don't crash
+		# Note: This matches the value of THREAD_STACK_SIZE in
+		# thread_pthread.h
 		LINKFORSHARED="-Wl,-stack_size,1000000 $LINKFORSHARED"
 
 		if test "$enable_framework"

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+Increase the default stack size of threads from 5MB to 16MB on macOS, to`
	`2`	`+match the stack size of the main thread. This avoids crashes on deep recursion`
	`3`	`+in threads.`