src/http/ngx_http_upstream.c:591: error: Integer Overflow L2
  ([0, `r->main->count` + 3] - 1):unsigned32 by call to `ngx_http_upstream_connect`.

src/http/ngx_http_upstream.c:471:1: Parameter `r->main->count`
469. 
470. 
471. static void
     ^
472. ngx_http_upstream_init_request(ngx_http_request_t *r)
473. {

src/http/ngx_http_upstream.c:591:13: Call
589.             }
590. 
591.             ngx_http_upstream_connect(r, u);
                 ^
592. 
593.             return;

src/http/ngx_http_upstream.c:1132:1: Parameter `r->main->count`
  1130. 
  1131. 
  1132. static void
        ^
  1133. ngx_http_upstream_connect(ngx_http_request_t *r, ngx_http_upstream_t *u)
  1134. {

src/http/ngx_http_upstream.c:1175:9: Call
  1173.     if (rc == NGX_BUSY) {
  1174.         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no live upstreams");
  1175.         ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_NOLIVE);
                ^
  1176.         return;
  1177.     }

src/http/ngx_http_upstream.c:3158:1: Parameter `r->main->count`
    3156. 
    3157. 
    3158. static void
          ^
    3159. ngx_http_upstream_next(ngx_http_request_t *r, ngx_http_upstream_t *u,
    3160.     ngx_uint_t ft_type)

src/http/ngx_http_upstream.c:3224:9: Call
    3222. 
    3223.     if (r->connection->error) {
    3224.         ngx_http_upstream_finalize_request(r, u,
                  ^
    3225.                                            NGX_HTTP_CLIENT_CLOSED_REQUEST);
    3226.         return;

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 + 3] - 1):unsigned32 by call to `ngx_http_upstream_connect` 
          3272.                    "post action: \"%V\"", &clcf->post_action);
          3273. 
          3274.     r->main->count--;
                    ^
          3275. 
          3276.     r->http_version = NGX_HTTP_VERSION_9;
