Error: Event loop is closed, when trying t.

[Aakarshit-Sharma19]

I am getting error when trying to get a value from a RedisCache. This error specifically comes in code when I am running the unit tests with starlette client in a starlette project. I'll mock the caching in the unit tests but still concerned if this error will crash the system.

FAILED [ 64%][2025-09-24 11:19:43,106] [ERROR] [exceptions:108]: RuntimeError('Event loop is closed')
Traceback (most recent call last):
File "/path/to/venv/lib/python3.12/site-packages/redis/asyncio/connection.py", line 599, in read_response
response = await self._parser.read_response(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/redis/_parsers/resp2.py", line 82, in read_response
response = await self._read_response(disable_decoding=disable_decoding)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/redis/_parsers/resp2.py", line 90, in _read_response
raw = await self._readline()
^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/redis/_parsers/base.py", line 283, in _readline
data = await self._stream.readline()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/python/lib/python3.12/asyncio/streams.py", line 565, in readline
line = await self.readuntil(sep)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/python/lib/python3.12/asyncio/streams.py", line 657, in readuntil
await self._wait_for_data('readuntil')
File "/path/to/python/lib/python3.12/asyncio/streams.py", line 542, in _wait_for_data
await self._waiter
RuntimeError: Task <Task pending name='anyio.from_thread.BlockingPortal._call_func' coro=<BlockingPortal._call_func() running at /path/to/venv/lib/python3.12/site-packages/anyio/from_thread.py:222> cb=[TaskGroup._spawn..task_done() at /path/to/venv/lib/python3.12/site-packages/anyio/_backends/_asyncio.py:794]> got Future attached to a different loop
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/path/to/venv/lib/python3.12/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/swagger_ui.py", line 222, in call
await self.router(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 716, in call
await self.middleware_stack(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 736, in app
await route.handle(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 462, in handle
await self.app(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 716, in call
await self.middleware_stack(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 766, in app
await self.default(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/swagger_ui.py", line 235, in default_fn
await self.app(original_scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/routing.py", line 154, in call
await self.router(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 716, in call
await self.middleware_stack(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 736, in app
await route.handle(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 462, in handle
await self.app(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 716, in call
await self.middleware_stack(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 736, in app
await route.handle(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/starlette/routing.py", line 290, in handle
await self.app(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/routing.py", line 48, in call
await self.next_app(original_scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/abstract.py", line 264, in call
return await operation(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/security.py", line 111, in call
await self.next_app(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/abstract.py", line 264, in call
return await operation(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/request_validation.py", line 142, in call
await self.next_app(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/abstract.py", line 264, in call
return await operation(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/lifespan.py", line 26, in call
await self.next_app(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/abstract.py", line 264, in call
return await operation(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/context.py", line 25, in call
await self.next_app(scope, receive, send)
File "/path/to/venv/lib/python3.12/site-packages/connexion/middleware/abstract.py", line 264, in call
return await operation(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/connexion/apps/asynchronous.py", line 69, in call
response = await self.fn()
^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/connexion/decorators/main.py", line 188, in wrapper
return await decorated_function(request)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/v/lib/python3.12/site-packages/connexion/decorators/response.py", line 191, in wrapper
handler_response = await function(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/connexion/decorators/parameter.py", line 115, in wrapper
return await function(**kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/connexion/decorators/main.py", line 173, in wrapper
return await function(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/ccs_auth/access/access_filter.py", line 73, in wrapper
return await target_fun
^^^^^^^^^^^^^^^^
File "/path/to/project/src/controllers/_controller.py", line 93, in counts
cached_value = await api_cache.get(cache_key)
File "/path/to/venv/lib/python3.12/site-packages/aiocache/base.py", line 64, in _enabled
return await func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/aiocache/base.py", line 48, in _timeout
return await asyncio.wait_for(func(self, args, *kwargs), timeout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/python/lib/python3.12/asyncio/tasks.py", line 520, in wait_for
return await fut
^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/aiocache/base.py", line 78, in _plugins
ret = await func(self, args, *kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/aiocache/base.py", line 199, in get
value = loads(await self._get(ns_key, encoding=self.serializer.encoding, _conn=_conn))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/aiocache/backends/redis.py", line 90, in _get
value = await self.client.get(key)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/redis/asyncio/client.py", line 677, in execute_command
return await conn.retry.call_with_retry(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/redis/asyncio/retry.py", line 50, in call_with_retry
return await do()
^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/redis/asyncio/client.py", line 652, in _send_command_parse_response
return await self.parse_response(conn, command_name, **options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/redis/asyncio/client.py", line 698, in parse_response
response = await connection.read_response()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/venv/lib/python3.12/site-packages/redis/asyncio/connection.py", line 619, in read_response
await self.disconnect(nowait=True)
File "/path/to/venv/lib/python3.12/site-packages/redis/asyncio/connection.py", line 479, in disconnect
self._writer.close() # type: ignore[union-attr]
^^^^^^^^^^^^^^^^^^^^
File "/path/to/python/lib/python3.12/asyncio/streams.py", line 355, in close
return self._transport.close()
^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/python/lib/python3.12/asyncio/selector_events.py", line 1206, in close
super().close()
File "/path/to/python/lib/python3.12/asyncio/selector_events.py", line 871, in close
self._loop.call_soon(self._call_connection_lost, None)
File "/path/to/python/lib/python3.12/asyncio/base_events.py", line 792, in call_soon
self._check_closed()
File "/path/to/python/lib/python3.12/asyncio/base_events.py", line 539, in _check_closed
raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed

[Dreamsorcerer]

We can't guess what the problem is without some code to reproduce it. You're using something in a way that it's getting called after the event loop is closed, that's nothing specific to aiocache.