modules/proxy/ajp_utils.c:50: error: INTEGER_OVERFLOW_L2
  ([0, +oo] - 4):unsigned64 by call to `ajp_ilink_send`.

modules/proxy/ajp_utils.c:43:10: Call
41.     }
42. 
43.     rc = ajp_msg_serialize_cping(msg);
             ^
44.     if (rc != APR_SUCCESS) {
45.         ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01008)

modules/proxy/ajp_msg.c:632:15: Call
  630.     ajp_msg_reset(msg);
  631. 
  632.     if ((rc = ajp_msg_append_uint8(msg, CMD_AJP13_CPING)) != APR_SUCCESS)
                     ^
  633.         return rc;
  634. 

modules/proxy/ajp_msg.c:303:1: Parameter `*msg->buf`
    301.  * @return          APR_SUCCESS or error
    302.  */
    303. apr_status_t ajp_msg_append_uint8(ajp_msg_t *msg, apr_byte_t value)
         ^
    304. {
    305.     apr_size_t len = msg->len;

modules/proxy/ajp_utils.c:50:10: Call
48.     }
49. 
50.     rc = ajp_ilink_send(sock, msg);
             ^
51.     ajp_msg_log(r, msg, "ajp_handle_cping_cpong: ajp_ilink_send packet dump");
52.     if (rc != APR_SUCCESS) {

modules/proxy/ajp_link.c:21:1: Parameter `msg->len`
  19. APLOG_USE_MODULE(proxy_ajp);
  20. 
  21. apr_status_t ajp_ilink_send(apr_socket_t *sock, ajp_msg_t *msg)
      ^
  22. {
  23.     char         *buf;

modules/proxy/ajp_link.c:27:5: Call
  25.     apr_size_t   length;
  26. 
  27.     ajp_msg_end(msg);
          ^
  28. 
  29.     length = msg->len;

modules/proxy/ajp_msg.c:220:1: <LHS trace>
218.  * @return          APR_SUCCESS or error
219.  */
220. apr_status_t ajp_msg_end(ajp_msg_t *msg)
     ^
221. {
222.     apr_size_t len = msg->len - AJP_HEADER_LEN;

modules/proxy/ajp_msg.c:220:1: Parameter `msg->len`
    218.  * @return          APR_SUCCESS or error
    219.  */
    220. apr_status_t ajp_msg_end(ajp_msg_t *msg)
         ^
    221. {
    222.     apr_size_t len = msg->len - AJP_HEADER_LEN;

modules/proxy/ajp_msg.c:222:5: Binary operation: ([0, +oo] - 4):unsigned64 by call to `ajp_ilink_send` 
    220. apr_status_t ajp_msg_end(ajp_msg_t *msg)
    221. {
    222.     apr_size_t len = msg->len - AJP_HEADER_LEN;
             ^
    223. 
    224.     if (msg->server_side) {
