README.md

Issue tracked at Nuitka/#165

This repo illustrates a potential bug when using Nuitka with asyncio coroutines. In some cases, Exceptions are returned as RuntimeError: cannot reuse already awaited coroutine instead of the correct Exception. This is very similar to bug Issue 404 fixed in 0.5.32 and bug Nuitka/#213.

It can be easily reproduced using Docker containers.

This bug is present in Python 3.6.8 and 3.7.3 (both tested with Nuitka 0.6.4)

How to trigger the bug

In this case, we wait on an asyncio.Event using another task. When we await on that task and expect a CancelledError we have a RuntimeError: cannot reuse already awaited coroutine.

Running on Linux (Docker) with native Python 3.6.8

# ./run-native.sh
( ... docker building the image ... )
Sleep for 1
Create Task
Cancel Task
Will await

Running on Linux (Docker), compiled with Nuitka 0.6.4 on Python 3.6.8

# ./run-nuitka.sh
( ... docker building the image ... )
Sleep for 1
Create Task
Cancel Task
Will await
Traceback (most recent call last):
  File "/opt/app/main.dist/main.py", line 33, in <module>
  File "/opt/app/main.dist/main.py", line 29, in main
  File "/opt/app/main.dist/asyncio/base_events.py", line 484, in run_until_complete
  File "/opt/app/main.dist/main.py", line 24, in run
RuntimeError: cannot reuse already awaited compiled_coroutine