we do not need to increase request counter in this place,

the bug had appeared in r3115

src/http/ngx_http_core_module.c

@@ -994,7 +994,6 @@ ngx_http_core_post_rewrite_phase(ngx_http_request_t *r,
                       "rewrite or internal redirection cycle "
                       "while processing \"%V\"", &r->uri);
 
-        r->main->count++;
         ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
         return NGX_OK;
     }