Segmentation fault on init with Python 3.10 (likely 3.9 as well) when MultiDict is subclassed (3.11,3.12,3.13 not affected) #1140
Description
I am using sanic with dishka and we encountered segfault in out tests when multidict==6.4.1 or 6.4.0. There is no problem on 6.2.0
We've tried python 3.10.12, 3.10.13, 3.10.17 on Linux. We do not see the problem on python 3.11-3.13. Also it looks like Windows is not affected
Minimal code to reproduce the problem
import asyncio
from sanic import Sanic
async def main():
app = Sanic("test")
await app.asgi_client.get("/")
if __name__ == "__main__":
asyncio.run(main())Current thread 0x0000725dacb1fb80 (most recent call first):
File "/usr/local/lib/python3.10/site-packages/sanic/asgi.py", line 135 in create
File "/usr/local/lib/python3.10/site-packages/sanic_testing/testing.py", line 324 in app_call_with_return
My pip list
# pip list
Package Version
----------------- ---------
aiofiles 24.1.0
anyio 4.9.0
argcomplete 3.6.2
asgi-lifespan 2.1.0
attrs 25.3.0
certifi 2025.1.31
colorlog 6.9.0
coverage 7.8.0
dependency-groups 1.3.0
dishka 0.1
distlib 0.3.9
exceptiongroup 1.2.2
filelock 3.18.0
h11 0.14.0
html5tagger 1.3.0
httpcore 1.0.7
httptools 0.6.4
httpx 0.27.2
idna 3.10
iniconfig 2.1.0
multidict 6.4.1
nox 2025.2.9
packaging 24.2
pip 23.0.1
platformdirs 4.3.7
pluggy 1.5.0
pytest 8.3.5
pytest-asyncio 0.24.0
pytest-cov 5.0.0
pytest-repeat 0.9.4
sanic 25.3.0
sanic-routing 23.12.0
sanic-testing 24.6.0
setuptools 78.1.0
sniffio 1.3.1
tomli 2.2.1
tracerite 1.1.1
typing_extensions 4.13.1
ujson 5.10.0
uvloop 0.21.0
virtualenv 20.30.0
websockets 15.0.1
wheel 0.42.0
Our failed pipeline (not much info): https://github.com/reagento/dishka/actions/runs/14364800642/job/40274975995?pr=426#step:8:2132