我的芹菜任务中发生手柄泄漏，这似乎是由台球造成的。游泳池，但是我不知道为什么，以及如何修复

Question

我的芹菜任务有手柄泄漏问题。这是我的伪代码：

import billiard as mp
from celery import shared_task

def ssh_op(ip, port, user, passwd, cmd, timeout=None, get_pty=False):
    logger.info(f'run {cmd} on {ip}:{port}')
    return True, ""  # just for test, i didn't run the actual cmd

def parse_results(results, timeout=None):
    logger.info("in parse_results")
    rets = []
    for res in results:
        try:
            ret, msg = res.get(timeout=timeout)
        except Exception as e:
            logger.error("return place 1")
            return False, str(e)
        if not ret:
            logger.error("return place 2")
            return False, msg
        else:
            rets.append(msg)
    logger.info("return place 3")
    return True, rets

@shared_task
def check_job_result(my_args):
    ...
    with mp.Pool(N) as pool:
        results = [pool.apply_async(ssh_op, args=(arg,)) for arg in my_args]
        logger.info('place 1')
        ret, msg= parse_results(results, timeout=10)
    if ret:
        return
    else:
        check_job_result.apply_async(args=(my_args,), dountdown=5)


### run check_job_result

如果我注释掉mp.Pool周围的代码，并构造虚拟ret和msg，则不会发生句柄泄漏。像这样：

@shared_task
def check_job_result(my_args):
    ...
    # with mp.Pool(N) as pool:
    #     results = [pool.apply_async(ssh_op, args=(arg,)) for arg in my_args]
    #     logger.info('place 1')
    #     ret, msg= parse_results(results, timeout=10)
    return = False
    msg = 'is still running'
    if ret:
        return
    else:
        check_job_result.apply_async(args=(my_args,), dountdown=5)

我不知道为什么以及如何解决它！

celery==4.3.0
django-celery-results==1.0.4
billiard==3.6.0.0

python==3.7.4