microsoft/autogen · error · RuntimeError

{self!r} is bound to a different event loop

Error message

{self!r} is bound to a different event loop

What it means

Error "{self!r} is bound to a different event loop" thrown in microsoft/autogen.

Source

Thrown at python/packages/autogen-core/src/autogen_core/_queue.py:24

import collections
import threading
from typing import Generic, TypeVar

_global_lock = threading.Lock()


class _LoopBoundMixin:
    _loop = None

    def _get_loop(self) -> asyncio.AbstractEventLoop:
        loop = asyncio.get_running_loop()

        if self._loop is None:
            with _global_lock:
                if self._loop is None:
                    self._loop = loop
        if loop is not self._loop:
            raise RuntimeError(f"{self!r} is bound to a different event loop")
        return loop


class QueueShutDown(Exception):
    """Raised when putting on to or getting from a shut-down Queue."""

    pass


T = TypeVar("T")


class Queue(_LoopBoundMixin, Generic[T]):
    def __init__(self, maxsize: int = 0):
        self._maxsize = maxsize
        self._getters = collections.deque[asyncio.Future[None]]()
        self._putters = collections.deque[asyncio.Future[None]]()
        self._unfinished_tasks = 0

View on GitHub (pinned to 027ecf0a37)

Solutions

1. Create the queue on the same loop that consumes it

Example fix

Instantiate asyncio.Queue inside the running loop's context

When it happens

Trigger: Thrown at python/packages/autogen-core/src/autogen_core/_queue.py:24 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/autogen@027ecf0a37 (2026-08-15). Data as JSON: /api/errors/29cced88242edd85. Report an issue: GitHub.