src/http/ngx_http_upstream.c:516: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_finalize_request`.

src/http/ngx_http_upstream.c:479:1: Parameter `r->uri_changes`
477. 
478. 
479. static void
     ^
480. ngx_http_upstream_init_request(ngx_http_request_t *r)
481. {

src/http/ngx_http_upstream.c:502:14: Call
500.         ngx_int_t  rc;
501. 
502.         rc = ngx_http_upstream_cache(r, u);
                  ^
503. 
504.         if (rc == NGX_BUSY) {

src/http/ngx_http_upstream.c:694:1: Parameter `r->uri_changes`
  692. #if (NGX_HTTP_CACHE)
  693. 
  694. static ngx_int_t
       ^
  695. ngx_http_upstream_cache(ngx_http_request_t *r, ngx_http_upstream_t *u)
  696. {

src/http/ngx_http_upstream.c:516:13: Call
514. 
515.         if (rc != NGX_DECLINED) {
516.             ngx_http_finalize_request(r, rc);
                 ^
517.             return;
518.         }

src/http/ngx_http_request.c:2251:1: Parameter `r->uri_changes`
  2249. 
  2250. 
  2251. void
        ^
  2252. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
  2253. {

src/http/ngx_http_request.c:2418:9: Call
  2416.     }
  2417. 
  2418.     if (ngx_http_post_action(r) == NGX_OK) {
                ^
  2419.         return;
  2420.     }

src/http/ngx_http_request.c:3336:1: Parameter `r->uri_changes`
    3334. 
    3335. 
    3336. static ngx_int_t
          ^
    3337. ngx_http_post_action(ngx_http_request_t *r)
    3338. {

src/http/ngx_http_request.c:3363:9: Call
    3361. 
    3362.     if (clcf->post_action.data[0] == '/') {
    3363.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                  ^
    3364. 
    3365.     } 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) {
