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[2021-12-02 14:42:45 @35530.0] WARNING ~Channel (ERRNO 10003): channel is destroyed, 9935 consumers will be discarded

### 问题描述

### Swoole版本，PHP版本，以及操作系统版本信息
php版本：PHP 7.4.24
Swoole版本:4.6.7
操作系统版本:window的docker的 CentOS Linux release 7.8.2003 (Core)

### 相关代码
```php
<?php

use Swoole\Coroutine\MySQL;
use function Swoole\Coroutine\run;
use Swoole\Coroutine;
use Swoole\Database\PDOConfig;
use Swoole\Database\PDOPool;
use Swoole\Runtime;
Runtime::enableCoroutine();

$max_coroutine = 10000;
//插入10000000条数据
Swoole\Coroutine::set(['max_coroutine'=>$max_coroutine]);
run(function () use ($max_coroutine) {
    $sql = "INSERT INTO `test_order` (`order_num`,`status`) VALUES(?,?)";
    $i = 0;
    $max = 10000000;

$pool = new PDOPool((new PDOConfig)
        ->withHost('127.0.0.1')
        ->withPort(3306)
        // ->withUnixSocket('/tmp/mysql.sock')
        ->withDbName('test')
        ->withCharset('utf8mb4')
        ->withUsername('root')
        ->withPassword('rootroot')
    );

$count = $max_coroutine;
    while ($i < $count) {
        Swoole\Coroutine\go(function () use ($pool,$sql,$i,$max,$count) {
            $db = $pool->get();
            $start = $i*(int)($max/$count);
            $end = $start + (int)($max/$count);
            for ($j = $start;$j < $end ;$j++) {
                $stmt = $db->prepare($sql);
                if ($stmt == false) {
                    var_dump($db->errno, $db->error);
                } else {
                    $ret2 = $stmt->execute([order_num($j), 1]);
                    if ($ret2) {
                        var_dump("$j:成功");
                    } else {
                        var_dump("$j:{$db->errno},{$db->error}");
                    }
                }
            }
        });

$i++;
    }

});

function order_num($i)
{
    return date("YmdHis").str_pad($i,8,0,STR_PAD_LEFT);
}
```

### 你期待的结果是什么？实际看到的错误信息又是什么？
没有全部执行完就停止了
 [Coroutine-9969]
--------------------------------------------------------------------
#0  Swoole\Coroutine\Channel->pop() called at [@swoole-src/library/core/ConnectionPool.php:60]
#1  Swoole\ConnectionPool->get() called at [/www/wwwroot/miscellaneous/test.php:34]

[2021-12-02 14:42:45 @35530.0]  WARNING ~Channel (ERRNO 10003): channel is destroyed, 9935 consumers will be discarded

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