php报错，网站502求助

1. <p>[06-Jul-2018 21:46:48] WARNING: [pool www] child 4343 exited on signal 15 (SIGTERM) after 2020.194777 seconds from start</p><p>[06-Jul-2018 21:46:48] NOTICE: [pool www] child 4773 started</p><p>[06-Jul-2018 21:46:48] WARNING: [pool www] child 4576 exited on signal 15 (SIGTERM) after 1380.146958 seconds from start</p><p>[06-Jul-2018 21:46:48] NOTICE: [pool www] child 4774 started</p><p>[06-Jul-2018 21:47:38] WARNING: [pool www] child 4600, script '/www/wwwroot/www.***.cn/index.php' (request: "GET /index.php") execution timed out (106.346023 sec), terminating</p><p>[06-Jul-2018 21:47:38] WARNING: [pool www] child 4166, script '/www/wwwroot/www.***.cn/index.php' (request: "GET /index.php") execution timed out (106.351880 sec), terminating</p><p>[06-Jul-2018 21:47:38] WARNING: [pool www] child 4600 exited on signal 15 (SIGTERM) after 1230.124802 seconds from start</p><p>[06-Jul-2018 21:47:38] NOTICE: [pool www] child 4782 started</p><p>[06-Jul-2018 21:47:38] WARNING: [pool www] child 4166 exited on signal 15 (SIGTERM) after 2521.198519 seconds from start</p><p>[06-Jul-2018 21:47:38] NOTICE: [pool www] child 4783 started</p><p>[06-Jul-2018 21:52:08] WARNING: [pool www] child 4603, script '/www/wwwroot/www.***.cn/index.php' (request: "GET /index.php") executing too slow (39.086951 sec), logging</p>

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php报错，打开网站502，找不到原因，求助
php5.4 和 php7.0 都一样，阿里云主机 双核4G centos

新建一个phpinfo函数的php文件，看下能不能正常访问