Nginx mod security module issue

Hi All

I have complied the* nginx 1.9.9* with ModSecurity support . and
configured the nginx,conf as fallows

Nginx Version : 1.9.9
Modsecurity Version : 2.9

nginx -V

nginx version: nginx/1.9.9
built by gcc 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04)
built with OpenSSL 1.0.1f 6 Jan 2014
TLS SNI support enabled
configure arguments: --user=www-data --group=www-data --with-pcre-jit
–with-debug --with-ipv6 --with-http_ssl_module
–add-module=/opt/modsecurity-2.9.0/nginx/modsecurity

*nginx.conf=========*user www-data;
worker_processes 1;

error_log /var/log/nginx/error.log;

events {
worker_connections 1024;
}

http {
include mime.types;
default_type application/octet-stream;
access_log /var/log/nginx/access.log;

sendfile        on;
keepalive_timeout  65;

 gzip  on;

server {
    listen       80;
    server_name  example.org;
    location / {

       ModSecurityEnabled on;
       ModSecurityConfig modsecurity.conf;

        root   html;
        index  index.html index.htm;
    }



 location /sonar {

 ModSecurityEnabled on;
 ModSecurityConfig modsecurity.conf;
 proxy_set_header X-Forwarded-Host $host;
 proxy_set_header X-Forwarded-Server $host;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 proxy_pass http://192.168.8.52:443/sonar;
}

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   html;
    }

}

→ When i access the http://example.org http://example.org i can
access the web page and modsecurity lodged the access data to to Audit
log .

→ Then i access the * http://example.org/sonar
http://example.org/sonar
*i get the following error in my logfile

2016/01/20 18:17:28 [alert] 3520#0: worker process 3549 exited on signal
11
(core dumped)
2016/01/20 18:17:29 [alert] 3520#0: worker process 3551 exited on signal
11
(core dumped)
2016/01/20 18:17:29 [alert] 3520#0: worker process 3553 exited on signal
11
(core dumped)
2016/01/20 18:17:29 [alert] 3520#0: worker process 3555 exited on signal
11
(core dumped)

Can you guys please how to over come this issue