<div dir="ltr"><div>Hello,</div><div>I have a pretty basic PHP / fastcgi setup with a fastcgi cache as follows:</div><div><br></div><div>fastcgi_cache_key "$scheme$request_method$host$request_uri";<br></div><div>
fastcgi_cache_lock on;<br></div><div><div>fastcgi_cache_bypass $skip_cache;</div><div>fastcgi_no_cache $skip_cache;</div><div>fastcgi_cache MAINCACHE;</div><div>fastcgi_cache_valid 5m;</div></div><div><br></div><div>I'm using nginx from the <a href="http://nginx.org">nginx.org</a> Debian repository and building from source, adding the geoip and ngx_cache_purge modules.</div>
<div><br></div><div><div>nginx version: nginx/1.5.7</div><div>built by gcc 4.7.2 (Debian 4.7.2-5)</div><div>TLS SNI support enabled</div><div><br></div></div><div>Every so often I'll get a couple of lines in the log like the following:</div>
<div><br></div><div><div>2013/12/09 15:59:34 [alert] 14218#0: *10450047 stalled cache updating, error:0 while closing request, client: x.236.101.34, server: x.x.101.37:80</div><div>2013/12/09 15:59:34 [alert] 14218#0: *10450055 stalled cache updating, error:0 while closing request, client: x.236.101.34, server: x.x.101.37:80</div>
<div>2013/12/09 15:59:34 [alert] 14218#0: *10450099 stalled cache updating, error:0 while closing request, client: x.236.101.34, server: x.x.101.37:80</div></div><div><br></div><div>This usually occurs after a client requests a script which issues some internal requests to the site itself (wp-cron).</div>
<div><br></div><div>As it's log level alert, it seems serious, but I can't seem to notice anything wrong as a result. What exactly does this alert mean and is it something I need to be worried about? I've since moved the script to an offline cron job to see if this helps, but I'm still curious exactly what this means.</div>
<div><br></div><div>Thanks,</div><div><br></div><div>Rich.</div></div>