Timer定时报错exit with status 139

以下是我的代码

require_once ROOT_PATH . '/vendor/autoload.php';
use \Workerman\Worker;
use \Workerman\Lib\Timer;

$task = new Worker();
// 开启多少个进程运行定时任务，注意多进程并发问题
$task->count = 1;
$task->name = "trendy-cron-server";
$task->onWorkerStart = function($task)
{
    $time_interval = 1;
    Timer::add($time_interval, function()
    {
        echo "task run\n";
    });
};

// 运行worker
Worker::runAll();

运行后的结果

2016-06-28 10:39:33 worker exit with status 139
2016-06-28 10:39:35 worker exit with status 139
2016-06-28 10:39:36 worker exit with status 139
2016-06-28 10:39:37 worker exit with status 139
2016-06-28 10:39:39 worker exit with status 139
2016-06-28 10:39:40 worker exit with status 139
2016-06-28 10:39:42 worker exit with status 139
2016-06-28 10:39:43 worker exit with status 139
2016-06-28 10:39:44 worker exit with status 139
2016-06-28 10:39:46 worker exit with status 139
2016-06-28 10:39:47 worker exit with status 139
2016-06-28 10:39:49 worker exit with status 139
2016-06-28 10:39:50 worker exit with status 139
2016-06-28 10:39:51 worker exit with status 139
2016-06-28 10:39:53 worker exit with status 139
2016-06-28 10:39:54 worker exit with status 139
2016-06-28 10:39:56 worker exit with status 139
2016-06-28 10:39:57 worker exit with status 139
2016-06-28 10:39:59 worker exit with status 139
2016-06-28 10:40:00 worker exit with status 139

timer 里面的‘echo "task run\n";’程序没执行，有懂的请帮忙看看，是哪块的问题，多谢了。

php版本是7.0