gh-141044: Raise TSan stack_size floor to 12 margins

TSan only uses half the stack in tstate_set_stack(), so the 6-margin
minimum that is enough for ASan/debug still leaked Thread objects at
the floor under ThreadSanitizer (refcount delta ~355). Require 12
margins for TSan. Update tests that assumed 256 KiB is always accepted.

Author: KingLizard1020

Include/internal/pycore_pythonrun.h

@@ -62,12 +62,15 @@ extern PyObject* _PyRun_SimpleString(
 #  define _PyOS_STACK_MARGIN_SHIFT (_PyOS_LOG2_STACK_MARGIN + 2)
 #endif
 
-#if (defined(Py_DEBUG) \
+#ifdef _Py_THREAD_SANITIZER
+/* TSan: tstate_set_stack() only uses half the stack, so the 6-margin
+ * floor that is enough for ASan/debug still leaves Thread bootstrap
+ * without working space (gh-141044). Require 12 margins. */
+#  define _PyOS_MIN_STACK_SIZE (_PyOS_STACK_MARGIN_BYTES * 12)
+#elif (defined(Py_DEBUG) \
      || defined(_Py_ADDRESS_SANITIZER) \
-     || defined(_Py_THREAD_SANITIZER) \
      || defined(_Py_UNDEFINED_BEHAVIOR_SANITIZER))
-/* Debug and sanitizer builds need more than the default 3 margins:
- * - TSan: tstate_set_stack() only uses half the stack.
+/* Debug/ASan/UBSan need more than the default 3 margins:
  * - ASan (gh-141044): instrumentation consumes extra C stack.
  * - Py_DEBUG / UBSan: larger C frames leave threading.Thread bootstrap
  *   with no working space above the soft recursion limit at 3 margins,