Error in nginx_http_push_module: unable to allocate message, worker subscriber queue marker in shared memory

[zeeshan.m.malik]

Hi,
I am using nginx_http_push_module for  a web service which provides real
time visitors stats for websites using our service. The service works
fine for couple of days but after that it stops responding and leaves
errors like following in error.log for each subscriber or publisher
request.

     2011/02/21 04:00:55 [crit] 18800#0: ngx_slab_alloc() failed: no
memory
     2011/02/21 04:00:55 [crit] 18800#0: ngx_slab_alloc() failed: no
memory
     2011/02/21 04:00:55 [error] 18800#0: *2812675 push module: unable
to allocate message in shared memory, client: 127.0.0.1, server:
async-presence.bumpin.com, request: "POST
/publish?id=a837a96c06a029d36c1503d9c450c79a HTTP/1.1", host:
"async-presence.bumpin.com"
     2011/02/21 04:00:58 [crit] 18798#0: ngx_slab_alloc() failed: no
memory
     2011/02/21 04:00:58 [crit] 18798#0: ngx_slab_alloc() failed: no
memory
     2011/02/21 04:00:58 [error] 18798#0: *2812340 push module: unable
to allocate worker subscriber queue marker in shared memory, client:
213.58.208.210, server: async-presence.bumpin.com, request: "GET
/activity?id=870897807857a92dcdfdadf3721aba71&_1298288754326= HTTP/1.1",
host: "async-presence.bumpin.com", referrer:
"http://www.keepersofmetal.net/search/label/Visions%20of%20Atlantis"
     2011/02/21 04:00:59 [crit] 18799#0: ngx_slab_alloc() failed: no
memory
     2011/02/21 04:00:59 [crit] 18799#0: ngx_slab_alloc() failed: no
memory
     2011/02/21 04:00:59 [error] 18799#0: *2812817 push module: unable
to allocate message in shared memory, client: 127.0.0.1, server:
async-presence.bumpin.com, request: "POST
/publish?id=d1637e1f2fedb569c1350a6ccd6d79e2 HTTP/1.1", host:
"async-presence.bumpin.com"
     2011/02/21 04:00:59 [crit] 18798#0: ngx_slab_alloc() failed: no
memory
     2011/02/21 04:00:59 [crit] 18798#0: ngx_slab_alloc() failed: no
memory
     2011/02/21 04:00:59 [error] 18798#0: *2812828 push module: unable
to allocate message in shared memory, client: 127.0.0.1, server:
async-presence.bumpin.com, request: "POST
/publish?id=f6d0850613e92edeacf3b7596aa304b3 HTTP/1.1", host:
"async-presence.bumpin.com"
     2011/02/21 04:01:00 [crit] 18798#0: ngx_slab_alloc() failed: no
memory
     2011/02/21 04:01:00 [crit] 18798#0: ngx_slab_alloc() failed: no
memory


And even when it is working it generates lots of errors
     2011/02/22 03:42:58 [alert] 4665#0: ngx_slab_free(): chunk is
already free 

Following are my push configurations:


        location /publish {
          set $push_channel_id $arg_id; #/?id=239aff3 or somesuch
          push_publisher;
 
          push_store_messages off; # enable message queueing
        }
 
        # public long-polling endpoint
        location /activity {
          push_subscriber;

          push_subscriber_concurrency broadcast;
          set $push_channel_id $arg_id;
          default_type text/plain;
          send_timeout 3600;
        }


And here is the output of command nginx -V
     nginx version: nginx/0.8.54
     built by gcc 4.3.3 (Ubuntu 4.3.3-5ubuntu4) 
     TLS SNI support enabled
     configure arguments: --conf-path=/etc/nginx/nginx.conf
--error-log-path=/var/log/nginx/error.log --pid-path=/var/run/nginx.pid
--lock-path=/var/lock/nginx.lock
--http-log-path=/var/log/nginx/access.log --with-http_dav_module
--http-client-body-temp-path=/var/lib/nginx/body --with-http_ssl_module
--http-proxy-temp-path=/var/lib/nginx/proxy
--with-http_stub_status_module
--http-fastcgi-temp-path=/var/lib/nginx/fastcgi --with-debug
--with-http_flv_module --add-module=/opt/nginx_http_push_module-0.692

Is this behavior due to some bug in the push module or is there
something wrong with my server configurations.

Thanks,
Zeeshan

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,178290,178290#msg-178290