The flock extension stuck at loading on Linux systems

[legendPerceptor]

The program cannot finish duckdb::LoadInternal(duckdb::ExtensionLoader&). There seems to be a deadlock. I don't see the same problem on macOS. But on Ubuntu 24.04 LOAD flock; never finishes. I built duckdb-python and flock from source. It is unrelated to duckdb's versions (I tried 1.4.0, 1.4.1 and yesterday 1.5.0). The versions of duckdb and flock match. I reproduce the same problem on both Ubuntu and EulerOS.

Have anyone successfully tested the extension on Linux? It is weird that it works perfectly on macOS but fails on Linux.

[anasdorbani]

@legendPerceptor, I tested the extension on both osx_arm64 and linux_amd64 using DuckDB versions 1.4.0, 1.4.1, and 1.4.2 with Python, and it seems to be working fine. Here’s the script I used:

import os
import duckdb
from dotenv import load_dotenv
load_dotenv()

if __name__ == "__main__":
    print("DuckDB:", duckdb.__version__)

    con = duckdb.connect(database=":memory:")
    con.execute("INSTALL flock FROM community;")
    con.execute("LOAD flock;")

    print(
        con.execute("""
                        SELECT *
                        FROM duckdb_extensions() 
                        WHERE extension_name = 'flock';""").fetchall()
    )

    openai_api_key = os.getenv("OPENAI_API_KEY")
    con.execute("CREATE SECRET (TYPE OPENAI, API_KEY ?);", [openai_api_key])

    model_alias = "test"
    base_model  = "gpt-4o"

    con.execute(f"""
        CREATE MODEL(
            '{model_alias}',
            '{base_model}',
            'openai',
            {{
                "tuple_format": "json",
                "batch_size": 32,
                "model_parameters": {{"temperature": 0.7}}
            }}
        );
    """)

    result_df = con.execute(f"""
        SELECT llm_complete(
            {{'model_name': '{model_alias}'}},
            {{'prompt': 'Talk like a duck and write a poem about a database'}}
            ) as completion;
    """).fetchdf()

    print(result_df)

The output I got:

DuckDB: 1.4.2
[('flock', True, True, '/Users/Me/.duckdb/extensions/v1.4.2/osx_arm64/flock.duckdb_extension', '', [], '7f1c36a', 'REPOSITORY', 'community')]
                                          completion
0  Quack, quack, quack,\nIn the pond, I chat with...

It works as expected on macOS. I haven’t tested on Ubuntu 24.04 with Python yet, but on macOS and Linux x86_64, specifically AlmaLinux, the extension loads and runs correctly with these versions.

[legendPerceptor]

It can possibly be a network issue. I needed to test it behind a corporate proxy, and I had a few issues even if I set HTTP_PROXY, and HTTPS_PROXY. So I wanted to build it from source and use the flock extension file directly instead of "INSTALL flock FROM community;". I used "LOAD /path/to/the/compiled/flock_extension". And it couldn't finish loading. I guess it might be trying to download it from community or otherwise I cannot explain it. I tried gdb attach to the process and it seems to get stuck at the function duckdb::LoadInternal(duckdb::ExtensionLoader&).

[legendPerceptor]

How does "INSTALL flock FROM community;" work? Where does it try to download from Internet? Maybe I can modify that part of code to make it work.