Merge 3.3.
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index 13c017d..fff00f4 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -451,7 +451,8 @@
     # #12316 and #11870), and fork() from a worker thread is known to trigger
     # problems with some operating systems (issue #3863): skip problematic tests
     # on platforms known to behave badly.
-    platforms_to_skip = ('freebsd4', 'freebsd5', 'freebsd6', 'netbsd5')
+    platforms_to_skip = ('freebsd4', 'freebsd5', 'freebsd6', 'netbsd5',
+                         'hp-ux11')
 
     def _run_and_join(self, script):
         script = """if 1: