zero size buf in output !!

[shahzaib shahzaib]

We're facing following error on edge server with nginx-1.6.1, using
proxy_store on edge.



2014/08/27 20:35:05 [alert] 5701#0: *21244 zero size buf in output t:0 r:0
f:0 0000000002579840 0000000002579840-000000000257A840 0000000000000000 0-0
while sending to client, client: 119.160.118.123, server:
storage4.content.com, request: "GET
/files/videos/2013/06/30/137256108550d07-m.mp4 HTTP/1.1", upstream: "
http://82.2.37.87:80/files/videos/2013/06/30/137256108550d07-m.mp4", host: "
storage4.content.com"
2014/08/27 20:35:28 [alert] 5687#0: *26261 zero size buf in output t:0 r:0
f:0 0000000004F5F2D0 0000000004F5F2D0-0000000004F602D0 0000000000000000 0-0
while sending to client, client: 121.52.147.68, server: storage9.content.com,
request: "GET /files/videos/2014/04/21/1398060531bb2e3-360.mp4 HTTP/1.1",
upstream: "
http://9.7.248.180:80/files/videos/2014/04/21/1398060531bb2e3-360.mp4",
host: "storage9.content.com", referrer: "
http://files.com/video/2618018/aashiqui-3-new-songs"

nginx version: nginx/1.6.1
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC)
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx
--conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log
--http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid
--lock-path=/var/run/nginx.lock
--http-client-body-temp-path=/var/cache/nginx/client_temp
--http-proxy-temp-path=/var/cache/nginx/proxy_temp --user=nginx
--group=nginx --with-http_flv_module --with-http_mp4_module

Regards.
Shahzaib
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