"Zero size buf" Error on file upload

[DamienR]

Hi,

I have a nginx server doing ffmpeg video conversions, we've noticed if we
upload a file around 100Mb in size it won't upload and throws a "zero buf"
error in nginx log; other logs not capture anything.

2014/01/31 22:18:49 [alert] 27455#0: *90757882 zero size buf in output t:0
r:0 f:1 0000000000000000 0000000000000000-0000000000000000 00000000023B4E68
0-0 while sending request to upstream, client: 120.xxx.x.51, server:
www.video.domain.com, request: "POST /ajax/language HTTP/1.1", upstream:
"fastcgi://127.0.0.1:9000", host: "video.domain.com", referrer:
"http://video.domain.com/upload/video"

This is also from wordpress install on the same server

2014/01/31 22:23:26 [alert] 27448#0: *90768658 zero size buf in output t:0
r:0 f:1 0000000000000000 0000000000000000-0000000000000000 00000000024DB4D8
0-0 while sending request to upstream, client: xxx.61.14.155, server:
domain.com.au, request: "POST
/wp-cron.php?doing_wp_cron=1391225006.5313498973846435546875 HTTP/1.0",
upstream: "fastcgi://127.0.0.1:9000", host: "domain.com.au"

build:

nginx version: nginx/1.4.4
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC)
TLS SNI support enabled
configure arguments: --sbin-path=/usr/local/sbin --with-http_mp4_module
--with-http_flv_module --with-http_gzip_static_module --with-http_gzip_stati
c_module --with-http_ssl_module --with-http_spdy_module
--with-http_secure_link_module --with-http_ssl_module


My worry is it's a configuration error, we've had site admin edit our config
as shown below, I see no changes though we still have large file problem and
zero buffer error.

    

    client_body_buffer_size 200m;
    client_max_body_size 300m;

    connection_pool_size 256;
    client_header_timeout 10m;
    client_body_timeout 10m;
    send_timeout 10m;
    keepalive_timeout     10;

    #FastCGI

    fastcgi_buffer_size 256k;
    fastcgi_buffers 256 16k;
    fastcgi_busy_buffers_size 256k;
    fastcgi_temp_file_write_size 256k;
    fastcgi_max_temp_file_size 0;
    fastcgi_send_timeout 600;
    fastcgi_read_timeout 600;
    fastcgi_connect_timeout 120;
    fastcgi_index  index.php;

Anyone had this error? I don't find much here about it.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,247069,247069#msg-247069