src/http/ngx_http_upstream.c:670: error: Integer Overflow L2
  ([0, `r->main->count` + 3] - 1):unsigned32 by call to `ngx_http_upstream_connect`.

src/http/ngx_http_upstream.c:517:1: Parameter `r->main->count`
515. 
516. 
517. static void
     ^
518. ngx_http_upstream_init_request(ngx_http_request_t *r)
519. {

src/http/ngx_http_upstream.c:670:13: Call
668.             }
669. 
670.             ngx_http_upstream_connect(r, u);
                 ^
671. 
672.             return;

src/http/ngx_http_upstream.c:1328:1: Parameter `r->main->count`
  1326. 
  1327. 
  1328. static void
        ^
  1329. ngx_http_upstream_connect(ngx_http_request_t *r, ngx_http_upstream_t *u)
  1330. {

src/http/ngx_http_upstream.c:1368:9: Call
  1366.     if (rc == NGX_BUSY) {
  1367.         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no live upstreams");
  1368.         ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_NOLIVE);
                ^
  1369.         return;
  1370.     }

src/http/ngx_http_upstream.c:3920:1: Parameter `r->main->count`
    3918. 
    3919. 
    3920. static void
          ^
    3921. ngx_http_upstream_next(ngx_http_request_t *r, ngx_http_upstream_t *u,
    3922.     ngx_uint_t ft_type)

src/http/ngx_http_upstream.c:3989:9: Call
    3987. 
    3988.     if (r->connection->error) {
    3989.         ngx_http_upstream_finalize_request(r, u,
                  ^
    3990.                                            NGX_HTTP_CLIENT_CLOSED_REQUEST);
    3991.         return;

src/http/ngx_http_upstream.c:4065:1: Parameter `r->main->count`
      4063. 
      4064. 
      4065. static void
            ^
      4066. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
      4067.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:4076:9: Call
      4074.     if (u->cleanup == NULL) {
      4075.         /* the request was already finalized */
      4076.         ngx_http_finalize_request(r, NGX_DONE);
                    ^
      4077.         return;
      4078.     }

src/http/ngx_http_request.c:2257:1: Parameter `r->main->count`
        2255. 
        2256. 
        2257. void
              ^
        2258. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
        2259. {

src/http/ngx_http_request.c:2423:9: Call
        2421.     }
        2422. 
        2423.     if (ngx_http_post_action(r) == NGX_OK) {
                      ^
        2424.         return;
        2425.     }

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 + 3] - 1):unsigned32 by call to `ngx_http_upstream_connect` 
          3356.                    "post action: \"%V\"", &clcf->post_action);
          3357. 
          3358.     r->main->count--;
                    ^
          3359. 
          3360.     r->http_version = NGX_HTTP_VERSION_9;
