What version of gRPC and what language are you using?

grpcio==1.59.0
python

What operating system (Linux, Windows,...) and version?

Linux (ubuntu, rodete)

What runtime / compiler are you using (e.g. python version or version of gcc)

Python 3.9.16
gcc version 13.2.0 (Debian 13.2.0-4)

What did you do?

I ran the sample code in googleapis/python-aiplatform#2805 (comment) provided by a user of google-cloud-aiplatform

1. Install google-cloud-aiplatform

pip install google-cloud-aiplatform

2. Run this code

from google.cloud import aiplatform_v1
from concurrent.futures import ThreadPoolExecutor

def init_model_gardern_service_client(_):
    # Create a client
    client = aiplatform_v1.ModelGardenServiceClient()

def parallel_execution():
    with ThreadPoolExecutor() as executor:
        results = list(executor.map(init_model_gardern_service_client, [None]*2))

if __name__ == "__main__":
    parallel_execution()

The code hangs with grpcio==1.59.0 but not grpcio==1.54.0, grpcio==1.56.0, grpcio==1.58.0 as an example

What did you expect to see?

I expected the code to run successfully.

What did you see instead?

Threads were hanging as reported in #31885

Anything else we should know about your project / environment?

I'm not able to reproduce the issue with other versions of grpc such as grpcio==1.54.0, grpcio==1.56.0, grpcio==1.58.0 so it's possible that there is a regression in grpcio==1.59.0