src/http/ngx_http_upstream.c:1641: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request`.

src/http/ngx_http_upstream.c:1608:1: Parameter `r->uri_changes`
1606. 
1607. 
1608. static ngx_int_t
      ^
1609. ngx_http_upstream_test_next(ngx_http_request_t *r, ngx_http_upstream_t *u)
1610. {

src/http/ngx_http_upstream.c:1641:13: Call
1639.             }
1640. 
1641.             ngx_http_upstream_finalize_request(r, u, rc);
                  ^
1642.             return NGX_OK;
1643.         }

src/http/ngx_http_upstream.c:2843:1: Parameter `r->uri_changes`
  2841. 
  2842. 
  2843. static void
        ^
  2844. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
  2845.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:2952:5: Call
  2950.     }
  2951. 
  2952.     ngx_http_finalize_request(r, rc);
            ^
  2953. }
  2954. 

src/http/ngx_http_request.c:1847:1: Parameter `r->uri_changes`
    1845. 
    1846. 
    1847. void
          ^
    1848. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
    1849. {

src/http/ngx_http_request.c:1886:13: Call
    1884.         || c->error)
    1885.     {
    1886.         if (ngx_http_post_action(r) == NGX_OK) {
                      ^
    1887.             return;
    1888.         }

src/http/ngx_http_request.c:2846:1: Parameter `r->uri_changes`
      2844. 
      2845. 
      2846. static ngx_int_t
            ^
      2847. ngx_http_post_action(ngx_http_request_t *r)
      2848. {

src/http/ngx_http_request.c:2869:9: Call
      2867. 
      2868.     if (clcf->post_action.data[0] == '/') {
      2869.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                    ^
      2870. 
      2871.     } else {

src/http/ngx_http_core_module.c:2172:1: <LHS trace>
2170. 
2171. 
2172. ngx_int_t
      ^
2173. ngx_http_internal_redirect(ngx_http_request_t *r,
2174.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2172:1: Parameter `r->uri_changes`
        2170. 
        2171. 
        2172. ngx_int_t
              ^
        2173. ngx_http_internal_redirect(ngx_http_request_t *r,
        2174.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2178:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request` 
        2176.     ngx_http_core_srv_conf_t  *cscf;
        2177. 
        2178.     r->uri_changes--;
                  ^
        2179. 
        2180.     if (r->uri_changes == 0) {
