Cache keeps growing despite Max_size limit

[jan5134]

Hi,

I'm having issues with nginx where my cache directory keeps growing until
the hdd is full.
If anyone can give me any information on how to solve this it will be
appreciated.

nginx -V:

nginx version: nginx/1.2.1
built by gcc 4.4.6 20110731 (Red Hat 4.4.6-3) (GCC) 
TLS SNI support enabled
configure arguments: --prefix=/usr/share/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
--http-client-body-temp-path=/var/lib/nginx/tmp/client_body
--http-proxy-temp-path=/var/lib/nginx/tmp/proxy
--http-fastcgi-temp-path=/var/lib/nginx/tmp/fastcgi
--http-uwsgi-temp-path=/var/lib/nginx/tmp/uwsgi
--http-scgi-temp-path=/var/lib/nginx/tmp/scgi --pid-path=/var/run/nginx.pid
--lock-path=/var/lock/subsys/nginx --user=nginx --group=nginx
--with-file-aio --with-ipv6 --with-http_ssl_module --with-http_realip_module
--with-http_addition_module --with-http_sub_module --with-http_dav_module
--with-http_flv_module --with-http_mp4_module --with-http_gzip_static_module
--with-http_random_index_module --with-http_secure_link_module
--with-http_degradation_module --with-http_stub_status_module
--with-http_perl_module --with-mail --with-mail_ssl_module
--add-module=/root/nginx-1.2.1/ngx_slowfs_cache-1.9
--add-module=/root/nginx-1.2.1/nginx-sticky-module-1.0

nginx.conf:
user                            apache;

worker_processes                4;

error_log                       /var/log/nginx/error.log emerg;
pid                             /var/run/nginx.pid;

worker_rlimit_nofile 30000;

events {
        worker_connections      8192;
        use                     epoll;
        multi_accept            off;
}

http {
        include                 /etc/nginx/mime.types;

        sendfile                on;

        gzip                    on;
        gzip_min_length         10;
        gzip_types              text/plain text/css image/png image/gif
image/jpeg application/x-javascript text/xml
                                application/xml application/xml+rss
text/javascript application/javascript;
        gzip_vary               on;
        gzip_comp_level         9;
        gzip_proxied            any;
        gzip_disable            msie6;

        tcp_nodelay             off;

        log_format              '$remote_addr - $remote_user [$time_local]'
'"$request" $status $bytes_sent '
                                '"$http_referer" "$http_user_agent"
"$gzip_ratio"';

        slowfs_cache_path       /var/cache/nginx/cache levels=1:2
keys_zone=fastcache:4096m max_size=25g;
        slowfs_temp_path        /var/cache/nginx/temp 1 2;

        proxy_buffer_size       128k;
        proxy_buffers           4 256k;
        proxy_busy_buffers_size 256k;

        include                 /etc/nginx/sites-enabled/*;
}

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,236987,236987#msg-236987