src/http/ngx_http_upstream.c:606: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_connect`.

src/http/ngx_http_upstream.c:479:1: Parameter `r->uri_changes`
477. 
478. 
479. static void
     ^
480. ngx_http_upstream_init_request(ngx_http_request_t *r)
481. {

src/http/ngx_http_upstream.c:606:13: Call
604.             }
605. 
606.             ngx_http_upstream_connect(r, u);
                 ^
607. 
608.             return;

src/http/ngx_http_upstream.c:1197:1: Parameter `r->uri_changes`
  1195. 
  1196. 
  1197. static void
        ^
  1198. ngx_http_upstream_connect(ngx_http_request_t *r, ngx_http_upstream_t *u)
  1199. {

src/http/ngx_http_upstream.c:1240:9: Call
  1238.     if (rc == NGX_BUSY) {
  1239.         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no live upstreams");
  1240.         ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_NOLIVE);
                ^
  1241.         return;
  1242.     }

src/http/ngx_http_upstream.c:3398:1: Parameter `r->uri_changes`
    3396. 
    3397. 
    3398. static void
          ^
    3399. ngx_http_upstream_next(ngx_http_request_t *r, ngx_http_upstream_t *u,
    3400.     ngx_uint_t ft_type)

src/http/ngx_http_upstream.c:3464:9: Call
    3462. 
    3463.     if (r->connection->error) {
    3464.         ngx_http_upstream_finalize_request(r, u,
                  ^
    3465.                                            NGX_HTTP_CLIENT_CLOSED_REQUEST);
    3466.         return;

src/http/ngx_http_upstream.c:3536:1: Parameter `r->uri_changes`
      3534. 
      3535. 
      3536. static void
            ^
      3537. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
      3538.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:3675:9: Call
      3673. 
      3674.     if (r->header_only) {
      3675.         ngx_http_finalize_request(r, rc);
                    ^
      3676.         return;
      3677.     }

src/http/ngx_http_request.c:2251:1: Parameter `r->uri_changes`
        2249. 
        2250. 
        2251. void
              ^
        2252. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
        2253. {

src/http/ngx_http_request.c:2289:13: Call
        2287.         || c->error)
        2288.     {
        2289.         if (ngx_http_post_action(r) == NGX_OK) {
                          ^
        2290.             return;
        2291.         }

src/http/ngx_http_request.c:3336:1: Parameter `r->uri_changes`
          3334. 
          3335. 
          3336. static ngx_int_t
                ^
          3337. ngx_http_post_action(ngx_http_request_t *r)
          3338. {

src/http/ngx_http_request.c:3363:9: Call
          3361. 
          3362.     if (clcf->post_action.data[0] == '/') {
          3363.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                        ^
          3364. 
          3365.     } 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_upstream_connect` 
            2565.     ngx_http_core_srv_conf_t  *cscf;
            2566. 
            2567.     r->uri_changes--;
                      ^
            2568. 
            2569.     if (r->uri_changes == 0) {
