[img]http://blog.chinaunix.net/photo/6889_101223144343.jpg[/img]
I drawed a picture according to the code of the nginx-0.9.1. The top part in the picture is built in the ngx_http_block of ngx_http.c.

When the ngx_http_merge_servers function at line 277 is called, the ctx->srv_conf have hold the address of cf->ctx->srv_conf. After ctx->srv_conf = cscfp[s]->ctx->srv_conf, ctx->srv_conf discard it's older address to point to the new address cscfp[s]->ctx->srv_conf.

So I think it will generate memory leak.