The udp failures are also observed with ares, so not specific to the dnspython changes.

src/greentest/known_failures.py

@@ -11,7 +11,6 @@ from greentest.sysinfo import RUNNING_ON_TRAVIS as TRAVIS
 from greentest.sysinfo import RUN_LEAKCHECKS as LEAKTEST
 from greentest.sysinfo import RUN_COVERAGE as COVERAGE
 from greentest.sysinfo import RESOLVER_NOT_SYSTEM
-from greentest.sysinfo import RESOLVER_DNSPYTHON
 
 from greentest.sysinfo import PYPY
 from greentest.sysinfo import PY3
@@ -158,7 +157,7 @@ if PYPY:
             'test__socket_dns.py',
         ]
 
-        if TRAVIS and RESOLVER_DNSPYTHON:
+        if TRAVIS:
             FAILING_TESTS += [
                 # This fails to get the correct results, sometimes. I can't reproduce locally
                 'FLAKY test__example_udp_server.py',