src/http/ngx_http_upstream.c:3696: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request`.

src/http/ngx_http_upstream.c:3602:1: Parameter `r->uri_changes`
3600. 
3601. 
3602. static void
      ^
3603. ngx_http_upstream_next(ngx_http_request_t *r, ngx_http_upstream_t *u,
3604.     ngx_uint_t ft_type)

src/http/ngx_http_upstream.c:3696:17: Call
3694.                 }
3695. 
3696.                 ngx_http_upstream_finalize_request(r, u, rc);
                      ^
3697.                 return;
3698.             }

src/http/ngx_http_upstream.c:3744:1: Parameter `r->uri_changes`
  3742. 
  3743. 
  3744. static void
        ^
  3745. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
  3746.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:3756:9: Call
  3754.     if (u->cleanup == NULL) {
  3755.         /* the request was already finalized */
  3756.         ngx_http_finalize_request(r, NGX_DONE);
                ^
  3757.         return;
  3758.     }

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:2287:13: Call
    2285.         || c->error)
    2286.     {
    2287.         if (ngx_http_post_action(r) == NGX_OK) {
                      ^
    2288.             return;
    2289.         }

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:2581:1: <LHS trace>
2579. 
2580. 
2581. ngx_int_t
      ^
2582. ngx_http_internal_redirect(ngx_http_request_t *r,
2583.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2581:1: Parameter `r->uri_changes`
        2579. 
        2580. 
        2581. ngx_int_t
              ^
        2582. ngx_http_internal_redirect(ngx_http_request_t *r,
        2583.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2587:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request` 
        2585.     ngx_http_core_srv_conf_t  *cscf;
        2586. 
        2587.     r->uri_changes--;
                  ^
        2588. 
        2589.     if (r->uri_changes == 0) {
