src/http/ngx_http_upstream.c:556: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_finalize_request`.

src/http/ngx_http_upstream.c:505:1: Parameter `r->uri_changes`
503. 
504. 
505. static void
     ^
506. ngx_http_upstream_init_request(ngx_http_request_t *r)
507. {

src/http/ngx_http_upstream.c:556:13: Call
554. 
555.         if (rc != NGX_DECLINED) {
556.             ngx_http_finalize_request(r, rc);
                 ^
557.             return;
558.         }

src/http/ngx_http_request.c:2249:1: Parameter `r->uri_changes`
  2247. 
  2248. 
  2249. void
        ^
  2250. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
  2251. {

src/http/ngx_http_request.c:2415:9: Call
  2413.     }
  2414. 
  2415.     if (ngx_http_post_action(r) == NGX_OK) {
                ^
  2416.         return;
  2417.     }

src/http/ngx_http_request.c:3344:1: Parameter `r->uri_changes`
    3342. 
    3343. 
    3344. static ngx_int_t
          ^
    3345. ngx_http_post_action(ngx_http_request_t *r)
    3346. {

src/http/ngx_http_request.c:3371:9: Call
    3369. 
    3370.     if (clcf->post_action.data[0] == '/') {
    3371.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                  ^
    3372. 
    3373.     } else {

src/http/ngx_http_core_module.c:2561:1: <LHS trace>
2559. 
2560. 
2561. ngx_int_t
      ^
2562. ngx_http_internal_redirect(ngx_http_request_t *r,
2563.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2561:1: Parameter `r->uri_changes`
      2559. 
      2560. 
      2561. ngx_int_t
            ^
      2562. ngx_http_internal_redirect(ngx_http_request_t *r,
      2563.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2567:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_finalize_request` 
      2565.     ngx_http_core_srv_conf_t  *cscf;
      2566. 
      2567.     r->uri_changes--;
                ^
      2568. 
      2569.     if (r->uri_changes == 0) {
