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Happy Eyeballs crashes with Eager Task Factory #124309

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Happy Eyeballs crashes with Eager Task Factory#124309
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3.12only security fixes3.13bugs and security fixes3.14bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytopic-asynciotype-bugAn unexpected behavior, bug, or error
@mhils

Description

@mhils
mhils
opened on Sep 22, 2024

Bug report

Bug description:

asyncio's staggered_race crashes when an eager task factory is being used:

import asyncio

async def main():
    asyncio.get_running_loop().set_task_factory(asyncio.eager_task_factory)
    await asyncio.open_connection("example.com", 80, happy_eyeballs_delay=0.25)

asyncio.run(main())
Traceback (most recent call last):
  [...]
  File "/tmp/repro.py", line 5, in main
    await asyncio.open_connection("example.com", 80, happy_eyeballs_delay=0.25)
  File "/opt/homebrew/Cellar/python@3.12/3.12.6/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/streams.py", line 48, in open_connection
    transport, _ = await loop.create_connection(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/python@3.12/3.12.6/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/base_events.py", line 1109, in create_connection
    sock, _, _ = await staggered.staggered_race(
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/python@3.12/3.12.6/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/staggered.py", line 144, in staggered_race
    raise d.exception()
  File "/opt/homebrew/Cellar/python@3.12/3.12.6/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/staggered.py", line 101, in run_one_coro
    assert len(running_tasks) == this_index + 2
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError

See also: aio-libs/aiohttp#8599

CPython versions tested on:

3.12

Operating systems tested on:

macOS

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    3.12only security fixes3.13bugs and security fixes3.14bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytopic-asynciotype-bugAn unexpected behavior, bug, or error

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