src/http/ngx_http_upstream.c:568: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_finalize_request`.

src/http/ngx_http_upstream.c:517:1: Parameter `r->uri_changes`
515. 
516. 
517. static void
     ^
518. ngx_http_upstream_init_request(ngx_http_request_t *r)
519. {

src/http/ngx_http_upstream.c:568:13: Call
566. 
567.         if (rc != NGX_DECLINED) {
568.             ngx_http_finalize_request(r, rc);
                 ^
569.             return;
570.         }

src/http/ngx_http_request.c:2257:1: Parameter `r->uri_changes`
  2255. 
  2256. 
  2257. void
        ^
  2258. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
  2259. {

src/http/ngx_http_request.c:2295:13: Call
  2293.         || c->error)
  2294.     {
  2295.         if (ngx_http_post_action(r) == NGX_OK) {
                    ^
  2296.             return;
  2297.         }

src/http/ngx_http_request.c:3340:1: Parameter `r->uri_changes`
    3338. 
    3339. 
    3340. static ngx_int_t
          ^
    3341. ngx_http_post_action(ngx_http_request_t *r)
    3342. {

src/http/ngx_http_request.c:3367:9: Call
    3365. 
    3366.     if (clcf->post_action.data[0] == '/') {
    3367.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                  ^
    3368. 
    3369.     } 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) {
