diff --git a/sys/x86/x86/mp_x86.c b/sys/x86/x86/mp_x86.c
--- a/sys/x86/x86/mp_x86.c
+++ b/sys/x86/x86/mp_x86.c
@@ -871,6 +871,15 @@
 	nchildren = 0;
 	node = root;
 	while (node != NULL) {
+		/*
+		 * When some APICs are disabled, a node could be empty. It
+		 * doesn't make sense to create a cpu group for an emtpy node.
+		 * For that reason, skip it.
+		 */
+		if (CPU_EMPTY(&node->cpuset)) {
+			node = topo_next_node(root, node);
+			continue;
+		}
 		if (CPU_CMP(&node->cpuset, &root->cpuset) == 0) {
 			if (node->type == TOPO_TYPE_CACHE &&
 			    cg_root->cg_level < node->subtype)
@@ -896,8 +905,14 @@
 	if (nchildren == root->cpu_count)
 		return;
 
-	cg_root->cg_child = smp_topo_alloc(nchildren);
+	/*
+	 * We are not interested in nodes without children.
+	 */
 	cg_root->cg_children = nchildren;
+	if (nchildren == 0)
+		return;
+
+	cg_root->cg_child = smp_topo_alloc(nchildren);
 
 	/*
 	 * Now find again the same cache nodes as above and recursively
@@ -909,7 +924,8 @@
 		if ((node->type != TOPO_TYPE_GROUP &&
 		    node->type != TOPO_TYPE_NODE &&
 		    node->type != TOPO_TYPE_CACHE) ||
-		    CPU_CMP(&node->cpuset, &root->cpuset) == 0) {
+		    (CPU_CMP(&node->cpuset, &root->cpuset) == 0) ||
+		    (CPU_EMPTY(&node->cpuset))) {
 			node = topo_next_node(root, node);
 			continue;
 		}