src/http/ngx_http_upstream.c:2382: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request`.

src/http/ngx_http_upstream.c:2349:1: Parameter `r->uri_changes`
2347. 
2348. 
2349. static ngx_int_t
      ^
2350. ngx_http_upstream_test_next(ngx_http_request_t *r, ngx_http_upstream_t *u)
2351. {

src/http/ngx_http_upstream.c:2382:13: Call
2380.             }
2381. 
2382.             ngx_http_upstream_finalize_request(r, u, rc);
                  ^
2383.             return NGX_OK;
2384.         }

src/http/ngx_http_upstream.c:4163:1: Parameter `r->uri_changes`
  4161. 
  4162. 
  4163. static void
        ^
  4164. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
  4165.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:4174:9: Call
  4172.     if (u->cleanup == NULL) {
  4173.         /* the request was already finalized */
  4174.         ngx_http_finalize_request(r, NGX_DONE);
                ^
  4175.         return;
  4176.     }

src/http/ngx_http_request.c:2292:1: Parameter `r->uri_changes`
    2290. 
    2291. 
    2292. void
          ^
    2293. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
    2294. {

src/http/ngx_http_request.c:2473:9: Call
    2471.     }
    2472. 
    2473.     if (ngx_http_post_action(r) == NGX_OK) {
                  ^
    2474.         return;
    2475.     }

src/http/ngx_http_request.c:3376:1: Parameter `r->uri_changes`
      3374. 
      3375. 
      3376. static ngx_int_t
            ^
      3377. ngx_http_post_action(ngx_http_request_t *r)
      3378. {

src/http/ngx_http_request.c:3403:9: Call
      3401. 
      3402.     if (clcf->post_action.data[0] == '/') {
      3403.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                    ^
      3404. 
      3405.     } else {

src/http/ngx_http_core_module.c:2596:1: <LHS trace>
2594. 
2595. 
2596. ngx_int_t
      ^
2597. ngx_http_internal_redirect(ngx_http_request_t *r,
2598.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2596:1: Parameter `r->uri_changes`
        2594. 
        2595. 
        2596. ngx_int_t
              ^
        2597. ngx_http_internal_redirect(ngx_http_request_t *r,
        2598.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2602:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request` 
        2600.     ngx_http_core_srv_conf_t  *cscf;
        2601. 
        2602.     r->uri_changes--;
                  ^
        2603. 
        2604.     if (r->uri_changes == 0) {
