New submission from Jack Murray:
AttributeError in /usr/lib/python3.4/asyncio/tasks.py feels like it might be a
concurrency issue. I can't reproduce it, and my python isn't good enough to
know how to simulate raising the exception at a random time during the
execution of the program. Here's the PoC:
import asyncio
import sys
from asyncio import async
import time
import random
asyncio.tasks._DEBUG = True
loop = asyncio.get_event_loop()
def read_something():
print(input())
@asyncio.coroutine
def func(arg):
while True:
sys.stdout.write("\rtest"+str(arg))
yield from asyncio.sleep(0)
loop.add_reader(sys.stdin, read_something)
loop.call_soon(async, func(1))
loop.call_soon(async, func(2))
loop.call_soon(async, func(3))
loop.call_soon(async, func(4))
time.sleep(1)
try:
loop.run_forever()
except KeyboardInterrupt:
print("handled\n")
pass
finally:
pass
and here is the stack trace:
ktn:~/ $ python asynctest.py
[11:55:03]
test3^Chandled
Future/Task exception was never retrieved
future: Task(<func>)<exception=KeyboardInterrupt()>
Traceback (most recent call last):
File "asynctest.py", line 29, in <module>
loop.run_forever()
File "/usr/lib/python3.4/asyncio/base_events.py", line 184, in run_forever
self._run_once()
File "/usr/lib/python3.4/asyncio/base_events.py", line 800, in _run_once
handle._run()
File "/usr/lib/python3.4/asyncio/events.py", line 39, in _run
self._callback(*self._args)
File "/usr/lib/python3.4/asyncio/tasks.py", line 337, in _wakeup
self._step(value, None)
File "/usr/lib/python3.4/asyncio/tasks.py", line 283, in _step
result = next(coro)
File "/usr/lib/python3.4/asyncio/tasks.py", line 50, in __next__
return next(self.gen)
File "asynctest.py", line 18, in func
yield from asyncio.sleep(0)
File "/usr/lib/python3.4/asyncio/tasks.py", line 94, in wrapper
w = CoroWrapper(coro(*args, **kwds), func)
File "/usr/lib/python3.4/asyncio/tasks.py", line 42, in __init__
assert inspect.isgenerator(gen), gen
KeyboardInterrupt
Exception ignored in: <bound method CoroWrapper.__del__ of
<asyncio.tasks.CoroWrapper object at 0x7f0dedaf79d8>>
Traceback (most recent call last):
File "/usr/lib/python3.4/asyncio/tasks.py", line 62, in __del__
frame = self.gen.gi_frame
AttributeError: gen
----------
messages: 217112
nosy: Jack.Murray
priority: normal
severity: normal
status: open
title: Possible bug in asyncio
versions: Python 3.4, Python 3.5
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21340>
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