Python 3.13: KeyError: 'name' on request_meta in ResponseContextManager.__exit__ after GC #3050
Description
Prerequisites
- I am using the latest version of Locust
- I am reporting a bug, not asking a question
Description
After upgrade to Python 3.13 I've started seeing errors when running locust (I've added the traceback at the end). It seems if a GC happens within with self.client.get(..., catch_response=True) then somehow ResponseContextManager.request_meta gets cleared.
Changing ResponseContextManager.__init__ to copy the response.__dict__, instead of just grabbing it, seems to help. I'm not sure how that change affects the rest of the project.
The Traceback on failure:
[2025-02-19 07:59:11,514] SDUPC07/ERROR/locust.user.task: 'name'
Traceback (most recent call last):
File "/home/wsl/.cache/uv/archive-v0/s81GZnyMdf_txEZnLJlMJ/lib/python3.13/site-packages/locust/user/task.py", line 340, in run
self.execute_next_task()
~~~~~~~~~~~~~~~~~~~~~~^^
File "/home/wsl/.cache/uv/archive-v0/s81GZnyMdf_txEZnLJlMJ/lib/python3.13/site-packages/locust/user/task.py", line 373, in execute_next_task
self.execute_task(self._task_queue.popleft())
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/wsl/.cache/uv/archive-v0/s81GZnyMdf_txEZnLJlMJ/lib/python3.13/site-packages/locust/user/task.py", line 490, in execute_task
task(self.user)
~~~~^^^^^^^^^^^
File "/home/wsl/locust-gc-bug-demo/locustfile.py", line 10, in get_json
with self.client.get("/json", catch_response=True) as get_json:
~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/wsl/.cache/uv/archive-v0/s81GZnyMdf_txEZnLJlMJ/lib/python3.13/site-packages/locust/clients.py", line 368, in __exit__
self.url = self.request_meta["name"]
~~~~~~~~~~~~~~~~~^^^^^^^^
KeyError: 'name'
Command line
uv run --with=locust==2.32.10 -p 3.13 locust --headless -u 1 -t 1s
Locustfile contents
from locust import run_single_user, HttpUser, task
import gc
class Tests(HttpUser):
host = "https://httpbin.org"
@task
def get_json(self):
with self.client.get("/json", catch_response=True) as get_json:
gc.collect()
if __name__ == "__main__":
run_single_user(Tests)Python version
3.13.2
Locust version
2.32.10
Operating system
Ubuntu 20.04, but also happens on Windows