Weird crash over night with nginx

[Robert Gabriel]

Sorry, I cant reproduce the backtrace, but here is the config and nginx 
-V:

System: Ubuntu Linux 9.10 Server with kernel: 2.6.33-server (custom 
kernel build)

nginx version: nginx/0.8.34
TLS SNI support enabled
configure arguments: --prefix=/applications/nginx 
--conf-path=/etc/nginx/nginx.conf --with-http_ssl_module 
--with-http_realip_module --with-http_addition_module 
--with-http_flv_module --with-http_gzip_static_module 
--with-http_sub_module --http-log-path=/var/log/nginx/access_log 
--with-http_perl_module --user=www-data --group=www-data 
--http-fastcgi-temp-path=/applications/nginx/tmp/fastcgi 
--http-client-body-temp-path=/applications/nginx/tmp/client 
--http-proxy-temp-path=/applications/nginx/tmp/proxy 
--pid-path=/var/run/nginx.pid --error-log-path=/var/log/nginx/error_log 
--with-sha1=/usr/lib --with-md5=/usr/lib --with-file-aio

nginx config:

user        www-data;
worker_processes    2;
worker_cpu_affinity   0101 1010;
pid            /var/run/nginx.pid;
error_log      /var/log/nginx/error_log info;

events {
    worker_connections    1024;
    use       epoll;
}


http {
      include             mime.types;
      default_type        application/octet-stream;
  log_format main           '$remote_addr - $remote_user [$time_local] 
"$request" '
                                  '$status $body_bytes_sent 
"$http_referer" '
                                  '"$http_user_agent" 
"$http_x_forwarded_for"';
  client_body_timeout     60;
  client_header_timeout     60;
  send_timeout       60;
  server_tokens      off;
     server_names_hash_bucket_size  256;
  server_names_hash_max_size  512;
  aio        on;
  directio      1m;
  output_buffers      1 128k;
      sendfile            off;
      tcp_nopush           off;
  tcp_nodelay          off;
      keepalive_timeout      0;
      gzip          on;
      gzip_comp_level     9;
  gzip_buffers       16 8k;
  gzip_http_version     1.0;
  gzip_min_length     1024;
  gzip_vary       on;
  gzip_proxied            off;
  gzip_disable       msie6;
      gzip_types           text/plain text/css text/xml text/javascript 
application/x-javascript application/xml application/xml+rss;

  include        /etc/nginx/site-hosts/*;
  include        /etc/nginx/site-users/*;
  include                         /etc/nginx/site-virtual/*;

}
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