src/http/ngx_http_upstream.c:1662: error: Integer Overflow L2
  ([0, `r->main->count` + 4] - 1):unsigned32 by call to `ngx_http_upstream_intercept_errors`.

src/http/ngx_http_upstream.c:1527:1: Parameter `r->main->count`
1525. 
1526. 
1527. static void
      ^
1528. ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
1529. {

src/http/ngx_http_upstream.c:1658:13: Call
1656.         }
1657. 
1658.         if (ngx_http_upstream_test_next(r, u) == NGX_OK) {
                  ^
1659.             return;
1660.         }

src/http/ngx_http_upstream.c:1713:1: Parameter `r->main->count`
  1711. 
  1712. 
  1713. static ngx_int_t
        ^
  1714. ngx_http_upstream_test_next(ngx_http_request_t *r, ngx_http_upstream_t *u)
  1715. {

src/http/ngx_http_upstream.c:1662:13: Call
1660.         }
1661. 
1662.         if (ngx_http_upstream_intercept_errors(r, u) == NGX_OK) {
                  ^
1663.             return;
1664.         }

src/http/ngx_http_upstream.c:1757:1: Parameter `r->main->count`
  1755. 
  1756. 
  1757. static ngx_int_t
        ^
  1758. ngx_http_upstream_intercept_errors(ngx_http_request_t *r,
  1759.     ngx_http_upstream_t *u)

src/http/ngx_http_upstream.c:1770:9: Call
  1768. 
  1769.     if (status == NGX_HTTP_NOT_FOUND && u->conf->intercept_404) {
  1770.         ngx_http_upstream_finalize_request(r, u, NGX_HTTP_NOT_FOUND);
                ^
  1771.         return NGX_OK;
  1772.     }

src/http/ngx_http_upstream.c:3296:1: Parameter `r->main->count`
    3294. 
    3295. 
    3296. static void
          ^
    3297. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
    3298.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:3416:9: Call
    3414.         || rc == NGX_HTTP_CLIENT_CLOSED_REQUEST)
    3415.     {
    3416.         ngx_http_finalize_request(r, rc);
                  ^
    3417.         return;
    3418.     }

src/http/ngx_http_request.c:2198:1: Parameter `r->main->count`
      2196. 
      2197. 
      2198. void
            ^
      2199. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
      2200. {

src/http/ngx_http_request.c:2365:9: Call
      2363.     }
      2364. 
      2365.     if (ngx_http_post_action(r) == NGX_OK) {
                    ^
      2366.         return;
      2367.     }

src/http/ngx_http_request.c:3256:1: <LHS trace>
3254. 
3255. 
3256. static ngx_int_t
      ^
3257. ngx_http_post_action(ngx_http_request_t *r)
3258. {

src/http/ngx_http_request.c:3256:1: Parameter `r->main->count`
        3254. 
        3255. 
        3256. static ngx_int_t
              ^
        3257. ngx_http_post_action(ngx_http_request_t *r)
        3258. {

src/http/ngx_http_request.c:3274:5: Binary operation: ([0, r->main->count + 4] - 1):unsigned32 by call to `ngx_http_upstream_intercept_errors` 
        3272.                    "post action: \"%V\"", &clcf->post_action);
        3273. 
        3274.     r->main->count--;
                  ^
        3275. 
        3276.     r->http_version = NGX_HTTP_VERSION_9;
