src/http/ngx_http_upstream.c:1976: 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:1840:1: Parameter `r->main->count`
1838. 
1839. 
1840. static void
      ^
1841. ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
1842. {

src/http/ngx_http_upstream.c:1972:13: Call
1970.     if (u->headers_in.status_n >= NGX_HTTP_SPECIAL_RESPONSE) {
1971. 
1972.         if (ngx_http_upstream_test_next(r, u) == NGX_OK) {
                  ^
1973.             return;
1974.         }

src/http/ngx_http_upstream.c:2027:1: Parameter `r->main->count`
  2025. 
  2026. 
  2027. static ngx_int_t
        ^
  2028. ngx_http_upstream_test_next(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2029. {

src/http/ngx_http_upstream.c:1976:13: Call
1974.         }
1975. 
1976.         if (ngx_http_upstream_intercept_errors(r, u) == NGX_OK) {
                  ^
1977.             return;
1978.         }

src/http/ngx_http_upstream.c:2121:1: Parameter `r->main->count`
  2119. 
  2120. 
  2121. static ngx_int_t
        ^
  2122. ngx_http_upstream_intercept_errors(ngx_http_request_t *r,
  2123.     ngx_http_upstream_t *u)

src/http/ngx_http_upstream.c:2134:9: Call
  2132. 
  2133.     if (status == NGX_HTTP_NOT_FOUND && u->conf->intercept_404) {
  2134.         ngx_http_upstream_finalize_request(r, u, NGX_HTTP_NOT_FOUND);
                ^
  2135.         return NGX_OK;
  2136.     }

src/http/ngx_http_upstream.c:3744:1: Parameter `r->main->count`
    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:3887:9: Call
    3885. 
    3886.     if (r->header_only) {
    3887.         ngx_http_finalize_request(r, rc);
                  ^
    3888.         return;
    3889.     }

src/http/ngx_http_request.c:2249:1: Parameter `r->main->count`
      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: <LHS trace>
3338. 
3339. 
3340. static ngx_int_t
      ^
3341. ngx_http_post_action(ngx_http_request_t *r)
3342. {

src/http/ngx_http_request.c:3340:1: Parameter `r->main->count`
        3338. 
        3339. 
        3340. static ngx_int_t
              ^
        3341. ngx_http_post_action(ngx_http_request_t *r)
        3342. {

src/http/ngx_http_request.c:3358:5: Binary operation: ([0, r->main->count + 4] - 1):unsigned32 by call to `ngx_http_upstream_intercept_errors` 
        3356.                    "post action: \"%V\"", &clcf->post_action);
        3357. 
        3358.     r->main->count--;
                  ^
        3359. 
        3360.     r->http_version = NGX_HTTP_VERSION_9;
