src/http/ngx_http_special_response.c:604: error: Integer Overflow L2
  ([0, +oo] - 301):unsigned64.

src/http/ngx_http_special_response.c:533:1: <LHS trace>
531. 
532. 
533. static ngx_int_t
     ^
534. ngx_http_send_error_page(ngx_http_request_t *r, ngx_http_err_page_t *err_page)
535. {

src/http/ngx_http_special_response.c:533:1: Parameter `r->err_status`
531. 
532. 
533. static ngx_int_t
     ^
534. ngx_http_send_error_page(ngx_http_request_t *r, ngx_http_err_page_t *err_page)
535. {

src/http/ngx_http_special_response.c:604:12: Binary operation: ([0, +oo] - 301):unsigned64
602.     }
603. 
604.     return ngx_http_send_special_response(r, clcf, r->err_status
                ^
605.                                                    - NGX_HTTP_MOVED_PERMANENTLY
606.                                                    + NGX_HTTP_OFF_3XX);
