Nginx keep crashes when it is used in uwsgi (5 replies)

In my setup, i have nginx proxy in different machine, nginx server and uwsgi service. Once Nginx server receives the request from the proxy, it invokes the uwsgi call to using uwsgi socket, uwsgi module replies the request, after receiving the response from the uwsgi service nginx server forwards the response to the proxy, after transaction completes, nginx trying to close the socket connection and it crashes...

Nginx is not generating the backtrace, it is getting killed and worker threads are getting suspended... would you kindly help me out how to proceed further to debug the issue or fix the crash...

thanks
amaran