src/http/ngx_http_upstream.c:651: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request`.

src/http/ngx_http_upstream.c:538:1: Parameter `r->uri_changes`
536. 
537. 
538. static void
     ^
539. ngx_http_upstream_init_request(ngx_http_request_t *r)
540. {

src/http/ngx_http_upstream.c:651:13: Call
649.         u->state = ngx_array_push(r->upstream_states);
650.         if (u->state == NULL) {
651.             ngx_http_upstream_finalize_request(r, u,
                 ^
652.                                                NGX_HTTP_INTERNAL_SERVER_ERROR);
653.             return;

src/http/ngx_http_upstream.c:4247:1: Parameter `r->uri_changes`
  4245. 
  4246. 
  4247. static void
        ^
  4248. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
  4249.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:4392:9: Call
  4390. 
  4391.     if (r->header_only) {
  4392.         ngx_http_finalize_request(r, rc);
                ^
  4393.         return;
  4394.     }

src/http/ngx_http_request.c:2307:1: Parameter `r->uri_changes`
    2305. 
    2306. 
    2307. void
          ^
    2308. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
    2309. {

src/http/ngx_http_request.c:2345:13: Call
    2343.         || c->error)
    2344.     {
    2345.         if (ngx_http_post_action(r) == NGX_OK) {
                      ^
    2346.             return;
    2347.         }

src/http/ngx_http_request.c:3391:1: Parameter `r->uri_changes`
      3389. 
      3390. 
      3391. static ngx_int_t
            ^
      3392. ngx_http_post_action(ngx_http_request_t *r)
      3393. {

src/http/ngx_http_request.c:3418:9: Call
      3416. 
      3417.     if (clcf->post_action.data[0] == '/') {
      3418.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                    ^
      3419. 
      3420.     } else {

src/http/ngx_http_core_module.c:2378:1: <LHS trace>
2376. 
2377. 
2378. ngx_int_t
      ^
2379. ngx_http_internal_redirect(ngx_http_request_t *r,
2380.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2378:1: Parameter `r->uri_changes`
        2376. 
        2377. 
        2378. ngx_int_t
              ^
        2379. ngx_http_internal_redirect(ngx_http_request_t *r,
        2380.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2384:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request` 
        2382.     ngx_http_core_srv_conf_t  *cscf;
        2383. 
        2384.     r->uri_changes--;
                  ^
        2385. 
        2386.     if (r->uri_changes == 0) {
