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我正在尝试使用 python 多处理模块在多个设备上并行运行一堆 linux 命令。脚本能够串行连接到多个设备并开始并行执行 linux 命令。该脚本在第一次尝试中失败，但在第二次尝试中成功。

请查找错误日志：

    -E- !!! *** Exception occurred during execution *** !!!
    -E- Exception Name: ExceptionPexpect
    -E- Exception trace back: 
        Traceback (most recent call last):
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/test/lib/python3.5/site-packages/ptyprocess/ptyprocess.py", line 705, in isalive
        pid, status = os.waitpid(self.pid, waitpid_options)
    ChildProcessError: [Errno 10] No child processes

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/test/lib/python3.5/site-packages/pexpect/pty_spawn.py", line 23, in _wrap_ptyprocess_err
        yield
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/test/lib/python3.5/site-packages/pexpect/pty_spawn.py", line 705, in isalive
        alive = ptyproc.isalive()
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/test/lib/python3.5/site-packages/ptyprocess/ptyprocess.py", line 712, in isalive
        'on our process?')
    ptyprocess.util.PtyProcessError: isalive() encountered condition where "terminated" is 0, but there was no child process. Did someone else call waitpid() on our process?

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/warriorframework_py3/warrior/Framework/ClassUtils/WNetwork/warrior_cli_class.py", line 1627, in send_command
        if end_prompt else -1))
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/test/lib/python3.5/site-packages/pexpect/spawnbase.py", line 344, in expect
        timeout, searchwindowsize, async_)
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/test/lib/python3.5/site-packages/pexpect/spawnbase.py", line 372, in expect_list
        return exp.expect_loop(timeout)
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/test/lib/python3.5/site-packages/pexpect/expect.py", line 169, in expect_loop
        incoming = spawn.read_nonblocking(spawn.maxread, timeout)
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/test/lib/python3.5/site-packages/pexpect/pty_spawn.py", line 478, in read_nonblocking
        if not self.isalive():
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/test/lib/python3.5/site-packages/pexpect/pty_spawn.py", line 705, in isalive
        alive = ptyproc.isalive()
      File "/usr/lib/python3.5/contextlib.py", line 77, in __exit__
        self.gen.throw(type, value, traceback)
      File "/home/venkat/Desktop/setup_cleanup_with_parallel/test/lib/python3.5/site-packages/pexpect/pty_spawn.py", line 25, in _wrap_ptyprocess_err
        raise ExceptionPexpect(*e.args)
    pexpect.exceptions.ExceptionPexpect: isalive() encountered condition where "terminated" is 0, but there was no child process. Did someone else call waitpid() on our process?

代码：

    target_module = class to do the operation
    tc_args_dict = args
    jobs_list = []
    jobs_list = None

    for target_module in case_list:
        process, jobs_list, output_q = create_and_start_process_with_queue(target_module,
                                                                       tc_args_dict,
                                                                       jobs_list, output_q)

    print_debug("process: {0}".format(process))
    for job in jobs_list:
        job.join()

    def create_and_start_process_with_queue(target_module, tc_args_dict, jobs_list, output_q, p_name='')
        if output_q is None:
            utput_q = multiprocessing.Manager().Queue()

        args_dict["output_q"] = output_q
        args_list = []
        for _, value in args_dict.items():
            args_list.append(value)
        args_tuple = tuple(args_list)
        process = multiprocessing.Process(name=p_name, target=target_module, args=args_tuple)
        jobs_list.append(process)
        process.start()

        return process, jobs_list, output_q

任何人都可以在这里帮忙。

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