Task was destroyed but it's pending

[asvetlov]

On master, I see outputs from run_app() like follows:

======== Running on http://0.0.0.0:8080 ========
(Press CTRL+C to quit)
Task was destroyed but it is pending!
task: <Task pending name='Task-4' coro=<RequestHandler.start() done, defined at /home/andrew/.virtualenvs/multidict/lib/python3.8/site-packages/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7f8822ffef10>()]>>

I suspect it happens on errors and keepalive closing in web_protocol.py.
The message should go.

[marco-c]

Is there a way for us to avoid this error? Or is a fix in aiohttp strictly needed?

[asvetlov]

This is the regression of unreleased aiohttp version.

[marco-c]

Thanks for making me notice we were using 4.0.0a1... :P

[MaxIakovliev]

Same issue happens to me:
Running python 3.7
aiohttp -latest

[2020-03-18 11:39:36,763] [ERROR] [decoder.py:353 - raw_decode() ] Task was destroyed but it is pending!

task: <Task pending coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.7/site-packages/aiohttp-4.0.0a1-py3.7-linux-x86_64.egg/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7f02025e2850>()]>>

[2020-03-18 11:39:36,763] [ERROR] [decoder.py:353 - raw_decode() ] Task was destroyed but it is pending!

task: <Task pending coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.7/site-packages/aiohttp-4.0.0a1-py3.7-linux-x86_64.egg/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7f0202606a10>()]>>

[2020-03-18 11:39:36,763] [ERROR] [decoder.py:353 - raw_decode() ] Task was destroyed but it is pending!

task: <Task pending coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.7/site-packages/aiohttp-4.0.0a1-py3.7-linux-x86_64.egg/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7f02012b9450>()]>>

[2020-03-18 11:39:36,764] [ERROR] [decoder.py:353 - raw_decode() ] Task was destroyed but it is pending!

task: <Task pending coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.7/site-packages/aiohttp-4.0.0a1-py3.7-linux-x86_64.egg/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7f02012b92d0>()]>>

[2020-03-18 11:39:36,764] [ERROR] [decoder.py:353 - raw_decode() ] Task was destroyed but it is pending!

task: <Task pending coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.7/site-packages/aiohttp-4.0.0a1-py3.7-linux-x86_64.egg/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7f02023f9910>()]>>

[2020-03-18 11:39:36,764] [ERROR] [decoder.py:353 - raw_decode() ] Task was destroyed but it is pending!

task: <Task pending coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.7/site-packages/aiohttp-4.0.0a1-py3.7-linux-x86_64.egg/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7f02023f9a90>()]>>

[2020-03-18 11:39:36,764] [ERROR] [decoder.py:353 - raw_decode() ] Task was destroyed but it is pending!

task: <Task pending coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.7/site-packages/aiohttp-4.0.0a1-py3.7-linux-x86_64.egg/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7f0201290f10>()]>>

[2020-03-18 11:39:36,765] [ERROR] [decoder.py:353 - raw_decode() ] Task was destroyed but it is pending!

task: <Task pending coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.7/site-packages/aiohttp-4.0.0a1-py3.7-linux-x86_64.egg/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7f0201288b90>()]>>

[2020-03-18 11:39:36,765] [ERROR] [decoder.py:353 - raw_decode() ] Task was destroyed but it is pending!

task: <Task pending coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.7/site-packages/aiohttp-4.0.0a1-py3.7-linux-x86_64.egg/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7f0201288210>()]>>

[semiworks]

Same for me:

also python 3.7 / aiohttp -latest

2020-03-23 08:49:54,914 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() done, defined at ./libs/aiohttp/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e44fbdf8>()]>> 2020-03-23 08:49:54,914 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() done, defined at ./libs/aiohttp/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e44fbfa8>()]>> 2020-03-23 08:54:41,711 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() running at ./libs/aiohttp/aiohttp/web_protocol.py:461> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e450b1c8>()]>> 2020-03-23 08:54:41,711 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() running at ./libs/aiohttp/aiohttp/web_protocol.py:461> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e455ea68>()]>> 2020-03-23 08:54:41,711 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() running at ./libs/aiohttp/aiohttp/web_protocol.py:461> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e445f168>()]>> 2020-03-23 08:54:41,712 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() running at ./libs/aiohttp/aiohttp/web_protocol.py:461> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e455e5b8>()]>> 2020-03-23 08:54:41,712 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() running at ./libs/aiohttp/aiohttp/web_protocol.py:461> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e44a9d68>()]>> 2020-03-23 08:54:41,712 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() done, defined at ./libs/aiohttp/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e44fbd68>()]>> 2020-03-23 08:54:41,712 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() done, defined at ./libs/aiohttp/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e44fbfa8>()]>> 2020-03-23 08:54:41,712 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() done, defined at ./libs/aiohttp/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e44fbca8>()]>> 2020-03-23 08:54:41,713 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() done, defined at ./libs/aiohttp/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e4529f18>()]>> 2020-03-23 08:54:41,713 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() done, defined at ./libs/aiohttp/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e450bcd8>()]>> 2020-03-23 08:54:41,713 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() done, defined at ./libs/aiohttp/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e4529f78>()]>> 2020-03-23 08:54:41,713 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() done, defined at ./libs/aiohttp/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e4529108>()]>> 2020-03-23 08:54:41,713 ERROR Task was destroyed but it is pending! task: <Task pending coro=<RequestHandler.start() done, defined at ./libs/aiohttp/aiohttp/web_protocol.py:437> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7fe6e44a96d8>()]>>