Nginx Zero Size Buffer Alerts !!

[shahzaib shahzaib]

Hi,

We've many zero size buff alerts related to file_uploader.php file in nginx
logs :


2016/02/26 12:56:02 [alert] 71067#0: *12457068 zero size buf in output t:0
r:0 f:1 0000000000000000 0000000000000000-0000000000000000 0000000803E29F08
0-0 while sending request to upstream, client: 182.178.58.123, server:
domain.com request: "OPTIONS /actions/file_uploader.php HTTP/1.1",
upstream: "fastcgi://unix:/var/run/www.socket:", host: "domain.com"

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

Here is our Nginx Version :

[root at cw001 /usr/local/etc]# nginx -V
nginx version: nginx/1.8.0
built with OpenSSL 1.0.1j-freebsd 15 Oct 2014 (running with OpenSSL
1.0.1l-freebsd 15 Jan 2015)
TLS SNI support enabled
configure arguments: --prefix=/usr/local/etc/nginx --with-cc-opt='-I
/usr/local/include' --with-ld-opt='-L /usr/local/lib'
--conf-path=/usr/local/etc/nginx/nginx.conf
--sbin-path=/usr/local/sbin/nginx --pid-path=/var/run/nginx.pid
--error-log-path=/var/log/nginx-error.log --user=www --group=www
--with-file-aio --with-ipv6
--http-client-body-temp-path=/var/tmp/nginx/client_body_temp
--http-fastcgi-temp-path=/var/tmp/nginx/fastcgi_temp
--http-proxy-temp-path=/var/tmp/nginx/proxy_temp
--http-scgi-temp-path=/var/tmp/nginx/scgi_temp
--http-uwsgi-temp-path=/var/tmp/nginx/uwsgi_temp
--http-log-path=/var/log/nginx-access.log --with-http_flv_module
--with-http_geoip_module --with-http_mp4_module --with-http_realip_module
--with-http_secure_link_module --with-http_stub_status_module --with-pcre
--with-http_spdy_module --with-http_ssl_module

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

We don't have 3rd party module installed with nginx. Please let me know if
i am missing something important here which could be cause of these errors ?

Thanks in advance !!

Regards.
Shahzaib
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