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WARNING Server::check_worker_exit_status(): worker(pid=24, id=1) abnormal exit, status=255, signal=0

### 问题描述
使用swoft 的rpc服务。
客户端会隔一端时间 recv 超时 errCode=110 msg=Connection timed out interface

查看服务端日志发现
WARNING Server::check_worker_exit_status(): worker(pid=24, id=1) abnormal exit, status=255, signal=0

### Swoole版本，PHP版本，以及操作系统版本信息
swoole 4.8.3
PHP 7.2.34 (cli) (built: Dec 11 2020 10:44:02) ( NTS )
阿里云 centos7

### 相关代码
```php
客服端
$connection = new Client(SWOOLE_SOCK_TCP);
...
$result = $connection->recv();
        $trace[] = microtime(true);
        if (empty($result)) {
            // Has been reconnected OR receive date timeout
            $errCode = $connection->getErrCode();
            $errMsg =  $connection->getErrMsg();
            if ($reconnect || $errCode === SOCKET_ETIMEDOUT) {
                // fix: reusing use the connection will read old response data.
                if ($errCode === SOCKET_ETIMEDOUT) {
                    $connection->reconnect();
                }
                $message = sprintf($message, $errCode, $errMsg);
                throw new RpcClientException('recv:' . $message);//这里隔一端时间 recv 超时
            }

return $this->sendAndRecv($connection, $data, $message, true);
        }
		
		
服务端
    public function start(): void
    {
        $this->swooleServer = new SwooleServer($this->host, $this->port, $this->mode, $this->type);//$this->type=tcp
        $this->startSwoole();
    }
	
	    /**
     * Bind swoole event and start swoole server
     *
     * @throws ServerException
     */
    protected function startSwoole(): void
    {
        ...
        // Start swoole server
        $this->swooleServer->start();
    }
```

### 你期待的结果是什么？实际看到的错误信息又是什么？

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