请教一个 nginx 502 的错误

问题是我上传文件的时候，第一次可以上传成功，第二次就是 502 错误！而且没有任何错误信息，但是我重启 php-fpm 就又可以上传了！

还有我开启了 opcache ，但是我关闭了就可以了，也不需要重启 php-fpm ！

错误信息： nginx ：没有错误信息

php-fpm ：有 WARNING 信息 ``` [12-Aug-2016 19:48:04] WARNING: [pool www] child 974 xited on signal 11 (SIGSEGV) after 334.939708 seconds from start 

[12-Aug-2016 19:48:04] NOTICE: [pool www] child 1014 started ```

php-fpm ``` [root@iZ9432kvp6sZ log]# netstat -napo |grep "php-fpm" | wc -l 4

``` 

nginx 配置文件 （没有粘贴出来 server 端的）

 worker_processes auto; worker_rlimit_nofile 100000; #error_log logs/error.log; #error_log logs/error.log notice; #error_log logs/error.log info; #pid logs/nginx.pid; events { worker_connections 2048; multi_accept on; use epoll; } http { include mime.types; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; #access_log logs/access.log main; client_max_body_size 300M;#设置 post 数据大小 #gzip on; access_log off; error_log /var/log/nginx/error.log; #crit; server_tokens off; sendfile on; #tcp_nopush on; #tcp_nodelay on; #keepalive_timeout 65; #client_header_timeout 10; #client_body_timeout 10; #reset_timedout_connection on; #send_timeout 10; #limit_conn_zone $binary_remote_addr zOne=addr:5m; #limit_conn addr 100; default_type text/html; charset UTF-8; #gzip on; #gzip_proxied any; #gzip_min_length 1000; #gzip_comp_level 4; #gzip_types text/plain text/css application/json application/x-Javascript text/xml application/xml application/xml+rss text/Javascript; #open_file_cache max=100000 inactive=20s; #open_file_cache_valid 30s; #open_file_cache_min_uses 2; #open_file_cache_errors on; keepalive_timeout 65; fastcgi_connect_timeout 300; fastcgi_send_timeout 300; fastcgi_read_timeout 300; fastcgi_buffer_size 128k; fastcgi_buffers 8 128k;#8 128 fastcgi_busy_buffers_size 256k; fastcgi_temp_file_write_size 256k; 

php 的配置文件就是和默认一样的！