Multiprocessing Client connection, send call is blocking when multiple threads try to connect to IPC Server which is offline/down/not running

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難度
4/5
預估耗時
3-5 天
新手友好度
42/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
停滯
技術堆疊
python

研究方向

從 multiprocessing.connection.Client 入口點開始,在 IPC 伺服器離線時使用三個執行緒在 Windows 10 上重現此問題。追蹤為什麼只有一個呼叫會傳回連線遭拒例外;完成的標準是每個執行緒都會傳回,而不是一直遭到阻塞,並為此情境提供回歸涵蓋範圍。

由索引模型根據 Issue 內容生成。

描述

topic-multiprocessing type-bug

Bug report

When multiple threads access send call of multiprocessing Client to connect to server via IPC, the threads are blocked forever. This occurs when IPC server is down and the client tries to connect to server.

CODE:

from multiprocessing.connection import Client
def ipc_send(data={}):
    try:
        address = ('localhost', 56000)
        print("ipc address: ", address)
        conn = Client(address, authkey="SOMESECRET")
        conn.send(data)
        res = conn.recv()
        conn.close()
        return True
    except Exception as e:
        print(e)
    return None

As server is down, when ipc_send() is called by 3 different threads(including main thread), suprisingly only one thread has returned None with exception: [WinError 10061] No connection could be made because the target machine actively refused it.

It is trivial that Error would be connection refused as server is down, but only one thread has thrown the error and rest of the 2 threads are possibly blocked at

conn = Client(address, authkey="SOMESECRET")

Your environment

Python 3.8.8
OS: Windows 10.

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