[issue24478] asyncio: segfault in test_env_var_debug() on non-debug Windows buildbot

[Zachary Ware]

Zachary Ware added the comment:

Well, whatever it was, 44253ce374fc21402c15cbce9c2be0e184610882 seems to have 
fixed it.  As of build 35 on 3.x and build 31 on 3.5, test_asyncio passes on 
the Non-Debug Windows bot.

--
resolution:  - fixed
stage: needs patch - resolved
status: open - closed

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[issue24478] asyncio: segfault in test_env_var_debug() on non-debug Windows buildbot

[Zachary Ware]

Zachary Ware added the comment:

Actually, it looks like it's due to PEP 492:

C:\Users\Zachary\code\hg.python.org\3.5hg bisect -b
The first bad revision is:
changeset:   96411:d1959cafc68c
branch:  3.5
parent:  96407:e59966bb6de5
parent:  96410:b7b73029c825
user:Yury Selivanov yseliva...@sprymix.com
date:Sat May 30 21:02:34 2015 -0400
summary: Issue 24004: Support Awaitables (pep 492) in @asyncio.coroutine 
decorator

Not all ancestors of this changeset have been checked.
Use bisect --extend to continue the bisection from
the common ancestor, 943fa0e8b6a4.

--
stage:  - needs patch
type:  - behavior
versions: +Python 3.5

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[issue24478] asyncio: segfault in test_env_var_debug() on non-debug Windows buildbot

[Yury Selivanov]

Yury Selivanov added the comment:

Hi Zachary,

This is extremely strange.  The test doesn't even start the loop, it only 
creates it, and prints out what 'get_debug' says.

It can't be 'sys.set_coroutine_wrapper' either, as it's only called when a loop 
is running, or when it's about to start/stop running.

The change in 96411:d1959cafc68c can only affect running coroutines, but I 
don't think the tests invokes any.

asyncio itself does not even have any 'async def' functions (only in 
test_pep492.py)...

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[issue24478] asyncio: segfault in test_env_var_debug() on non-debug Windows buildbot

[STINNER Victor]

New submission from STINNER Victor:

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 0x0390 (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
---

--
components: Windows, asyncio
messages: 245551
nosy: gvanrossum, haypo, paul.moore, steve.dower, tim.golden, yselivanov, 
zach.ware
priority: normal
severity: normal
status: open
title: asyncio: segfault in test_env_var_debug() on non-debug Windows buildbot
versions: Python 3.6

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[issue24478] asyncio: segfault in test_env_var_debug() on non-debug Windows buildbot

[Steve Dower]

Steve Dower added the comment:

Presumably it's from the C implementation of lru cache

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[issue24478] asyncio: segfault in test_env_var_debug() on non-debug Windows buildbot

[Zachary Ware]

Zachary Ware added the comment:

Note that it's not necessarily that changeset; I think build 22 is around when 
the buildbot started actually doing non-debug builds (the buildmaster and 
buildslave scripts in Tools/buildbot had no support for a non-debug build 
before then).

I'll try to run the tests a little further back soon.

--

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