It looks like buildbot slave crashs since:
http://buildbot.python.org/all/builders/AMD64%20Windows8.1%20Non-Debug%203.x/builds/23
or
http://buildbot.python.org/all/builders/AMD64%20Windows8.1%20Non-Debug%203.x/builds/22

Changes: changeset a1b76c1c3be8409565af71b02b84685233276120

======================================================================
FAIL: test_env_var_debug (test.test_asyncio.test_base_events.BaseEventLoopTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "B:\buildarea\3.x.ware-win81-release\build\lib\test\test_asyncio\test_base_events.py", line 680, in test_env_var_debug
    PYTHONASYNCIODEBUG='')
  File "B:\buildarea\3.x.ware-win81-release\build\lib\test\support\script_helper.py", line 135, in assert_python_ok
    return _assert_python(True, *args, **env_vars)
  File "B:\buildarea\3.x.ware-win81-release\build\lib\test\support\script_helper.py", line 121, in _assert_python
    err))
AssertionError: Process return code is 3221225477
command line: ['B:\\buildarea\\3.x.ware-win81-release\\build\\PCbuild\\amd64\\python.exe', '-X', 'faulthandler', '-c', 'import asyncio\nloop = asyncio.get_event_loop()\nprint(loop.get_debug())']

stdout:
---

---

stderr:
---
Fatal Python error: Segmentation fault

Current thread 0x00000390 (most recent call first):
  File "B:\buildarea\3.x.ware-win81-release\build\lib\functools.py", line 423 in decorating_function
  File "B:\buildarea\3.x.ware-win81-release\build\lib\ipaddress.py", line 1963 in IPv6Address
  File "B:\buildarea\3.x.ware-win81-release\build\lib\ipaddress.py", line 1869 in <module>
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 661 in exec_module
  File "<frozen importlib._bootstrap>", line 673 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 958 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 969 in _find_and_load
  File "B:\buildarea\3.x.ware-win81-release\build\lib\ssl.py", line 90 in <module>
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 661 in exec_module
  File "<frozen importlib._bootstrap>", line 673 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 958 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 969 in _find_and_load
  File "B:\buildarea\3.x.ware-win81-release\build\lib\asyncio\sslproto.py", line 5 in <module>
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 661 in exec_module
  File "<frozen importlib._bootstrap>", line 673 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 958 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 969 in _find_and_load
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1016 in _handle_fromlist
  File "B:\buildarea\3.x.ware-win81-release\build\lib\asyncio\proactor_events.py", line 16 in <module>
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 661 in exec_module
  File "<frozen importlib._bootstrap>", line 673 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 958 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 969 in _find_and_load
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1016 in _handle_fromlist
  File "B:\buildarea\3.x.ware-win81-release\build\lib\asyncio\windows_events.py", line 13 in <module>
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 661 in exec_module
  File "<frozen importlib._bootstrap>", line 673 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 958 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 969 in _find_and_load
  File "B:\buildarea\3.x.ware-win81-release\build\lib\asyncio\__init__.py", line 46 in <module>
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 661 in exec_module
  File "<frozen importlib._bootstrap>", line 673 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 958 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 969 in _find_and_load
  File "<string>", line 1 in <module>
---