Nginx php upstream sent unexpected FastCGI record: 3 while reading response head

调用fastcgi_finish_request时，请求数超过max_requests时产生，fpm发送两次FCGI_END_REQUEST记录

测试的脚本及配置：

<?php

ignore_user_abort();

fastcgi_finish_request();

sleep(10);

?>

Nginx configuration

upstream fpm

{

    server 127.0.0.1:9000;

    keepalive 1;

}

server

{

    ......

    fastcgi_keep_conn on;

    fastcgi_param SCRIPT_NAME /index.php;

    fastcgi_pass fpm;

    ......

}

PHP FPM configuration

max_children = 1

max_requests = 2

Expected result:

----------------

No errors in nginx error log

Actual result:

--------------

Every second request is finished with 502 status

Nginx error.log contains records:

2014/07/07 13:42:58 [error] 11253#0: *1 upstream sent unexpected FastCGI record: 3 while reading response header from upstream, client: 127.0.0.1, server: localhost, request: "GET /nginx_test.phtml HTTP/1.1", upstream: "fastcgi://127.0.0.1:8002", host: "localhost:8081"

解决方案:

1. 升级到 php 7.0.16及以上

2. 设置max_requests=0 可能有内存泄露风险

参考资源：

http://serverfault.com/questions/827561/nginx-php7-unexpected-fastcgi-record-while-reading-response-header-from-upstre/828203

https://bugs.php.net/bug.php?id=67583