https://www.illumos.org/issues/12455

--- tornado-6.4.2/tornado/test/tcpserver_test.py.orig
+++ tornado-6.4.2/tornado/test/tcpserver_test.py
@@ -202,6 +202,7 @@
         self.assertEqual("".join(sorted(out)), "012")
         self.assertEqual(err, "")
 
+    @unittest.skip('No SO_REUSEPORT support')
     def test_listen_multi_reuse_port(self):
         code = textwrap.dedent(
             """