src/http/modules/ngx_http_limit_conn_module.c:360: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned64 by call to `ngx_slab_free_locked`.

src/http/modules/ngx_http_limit_conn_module.c:360:9: Call
358.     if (lc->conn == 0) {
359.         ngx_rbtree_delete(ctx->rbtree, node);
360.         ngx_slab_free_locked(shpool, node);
             ^
361.     }
362. 

src/core/ngx_slab.c:451:1: <LHS trace>
449. 
450. 
451. void
     ^
452. ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
453. {

src/core/ngx_slab.c:451:1: Global `ngx_pagesize`
  449. 
  450. 
  451. void
       ^
  452. ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
  453. {

src/core/ngx_slab.c:482:9: Binary operation: ([0, +oo] - 1):unsigned64 by call to `ngx_slab_free_locked` 
  480.         }
  481. 
  482.         n = ((uintptr_t) p & (ngx_pagesize - 1)) >> shift;
               ^
  483.         m = (uintptr_t) 1 << (n % (sizeof(uintptr_t) * 8));
  484.         n /= sizeof(uintptr_t) * 8;
