src/http/ngx_http_upstream.c:1640: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request`.

src/http/ngx_http_upstream.c:1607:1: Parameter `r->uri_changes`
1605. 
1606. 
1607. static ngx_int_t
      ^
1608. ngx_http_upstream_test_next(ngx_http_request_t *r, ngx_http_upstream_t *u)
1609. {

src/http/ngx_http_upstream.c:1640:13: Call
1638.             }
1639. 
1640.             ngx_http_upstream_finalize_request(r, u, rc);
                  ^
1641.             return NGX_OK;
1642.         }

src/http/ngx_http_upstream.c:2846:1: Parameter `r->uri_changes`
  2844. 
  2845. 
  2846. static void
        ^
  2847. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
  2848.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:2950:5: Call
  2948.     }
  2949. 
  2950.     ngx_http_finalize_request(r, rc);
            ^
  2951. }
  2952. 

src/http/ngx_http_request.c:1831:1: Parameter `r->uri_changes`
    1829. 
    1830. 
    1831. void
          ^
    1832. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
    1833. {

src/http/ngx_http_request.c:2001:9: Call
    1999.     }
    2000. 
    2001.     if (ngx_http_post_action(r) == NGX_OK) {
                  ^
    2002.         return;
    2003.     }

src/http/ngx_http_request.c:2809:1: Parameter `r->uri_changes`
      2807. 
      2808. 
      2809. static ngx_int_t
            ^
      2810. ngx_http_post_action(ngx_http_request_t *r)
      2811. {

src/http/ngx_http_request.c:2832:9: Call
      2830. 
      2831.     if (clcf->post_action.data[0] == '/') {
      2832.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                    ^
      2833. 
      2834.     } else {

src/http/ngx_http_core_module.c:2163:1: <LHS trace>
2161. 
2162. 
2163. ngx_int_t
      ^
2164. ngx_http_internal_redirect(ngx_http_request_t *r,
2165.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2163:1: Parameter `r->uri_changes`
        2161. 
        2162. 
        2163. ngx_int_t
              ^
        2164. ngx_http_internal_redirect(ngx_http_request_t *r,
        2165.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2169:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request` 
        2167.     ngx_http_core_srv_conf_t  *cscf;
        2168. 
        2169.     r->uri_changes--;
                  ^
        2170. 
        2171.     if (r->uri_changes == 0) {
