src/http/ngx_http_upstream.c:459: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_finalize_request`.

src/http/ngx_http_upstream.c:422:1: Parameter `r->uri_changes`
420. 
421. 
422. static void
     ^
423. ngx_http_upstream_init_request(ngx_http_request_t *r)
424. {

src/http/ngx_http_upstream.c:445:14: Call
443.         ngx_int_t  rc;
444. 
445.         rc = ngx_http_upstream_cache(r, u);
                  ^
446. 
447.         if (rc == NGX_BUSY) {

src/http/ngx_http_upstream.c:609:1: Parameter `r->uri_changes`
  607. #if (NGX_HTTP_CACHE)
  608. 
  609. static ngx_int_t
       ^
  610. ngx_http_upstream_cache(ngx_http_request_t *r, ngx_http_upstream_t *u)
  611. {

src/http/ngx_http_upstream.c:459:13: Call
457. 
458.         if (rc != NGX_DECLINED) {
459.             ngx_http_finalize_request(r, rc);
                 ^
460.             return;
461.         }

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:1870:13: Call
  1868.         || c->error)
  1869.     {
  1870.         if (ngx_http_post_action(r) == NGX_OK) {
                    ^
  1871.             return;
  1872.         }

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_finalize_request` 
      2167.     ngx_http_core_srv_conf_t  *cscf;
      2168. 
      2169.     r->uri_changes--;
                ^
      2170. 
      2171.     if (r->uri_changes == 0) {
