src/http/modules/ngx_http_limit_conn_module.c:409: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned16.

src/http/modules/ngx_http_limit_conn_module.c:404:5: <LHS trace>
402.     lc = (ngx_http_limit_conn_node_t *) &node->color;
403. 
404.     ngx_shmtx_lock(&ctx->shpool->mutex);
         ^
405. 
406.     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lccln->shm_zone->shm.log, 0,

src/http/modules/ngx_http_limit_conn_module.c:404:5: Call
402.     lc = (ngx_http_limit_conn_node_t *) &node->color;
403. 
404.     ngx_shmtx_lock(&ctx->shpool->mutex);
         ^
405. 
406.     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lccln->shm_zone->shm.log, 0,

src/core/ngx_shmtx.c:69:1: Parameter `mtx->spin`
  67. 
  68. 
  69. void
      ^
  70. ngx_shmtx_lock(ngx_shmtx_t *mtx)
  71. {

src/http/modules/ngx_http_limit_conn_module.c:409:5: Binary operation: ([0, +oo] - 1):unsigned16
407.                    "limit conn cleanup: %08Xi %d", node->key, lc->conn);
408. 
409.     lc->conn--;
         ^
410. 
411.     if (lc->conn == 0) {
