src/http/ngx_http_upstream.c:542: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_finalize_request`.

src/http/ngx_http_upstream.c:505:1: Parameter `r->uri_changes`
503. 
504. 
505. static void
     ^
506. ngx_http_upstream_init_request(ngx_http_request_t *r)
507. {

src/http/ngx_http_upstream.c:528:14: Call
526.         ngx_int_t  rc;
527. 
528.         rc = ngx_http_upstream_cache(r, u);
                  ^
529. 
530.         if (rc == NGX_BUSY) {

src/http/ngx_http_upstream.c:737:1: Parameter `r->uri_changes`
  735. #if (NGX_HTTP_CACHE)
  736. 
  737. static ngx_int_t
       ^
  738. ngx_http_upstream_cache(ngx_http_request_t *r, ngx_http_upstream_t *u)
  739. {

src/http/ngx_http_upstream.c:542:13: Call
540. 
541.         if (rc == NGX_ERROR) {
542.             ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                 ^
543.             return;
544.         }

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:3345:1: Parameter `r->uri_changes`
    3343. 
    3344. 
    3345. static ngx_int_t
          ^
    3346. ngx_http_post_action(ngx_http_request_t *r)
    3347. {

src/http/ngx_http_request.c:3372:9: Call
    3370. 
    3371.     if (clcf->post_action.data[0] == '/') {
    3372.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                  ^
    3373. 
    3374.     } else {

src/http/ngx_http_core_module.c:2549:1: <LHS trace>
2547. 
2548. 
2549. ngx_int_t
      ^
2550. ngx_http_internal_redirect(ngx_http_request_t *r,
2551.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2549:1: Parameter `r->uri_changes`
      2547. 
      2548. 
      2549. ngx_int_t
            ^
      2550. ngx_http_internal_redirect(ngx_http_request_t *r,
      2551.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2555:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_finalize_request` 
      2553.     ngx_http_core_srv_conf_t  *cscf;
      2554. 
      2555.     r->uri_changes--;
                ^
      2556. 
      2557.     if (r->uri_changes == 0) {
