D58312.diff
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	diff --git a/sys/vm/uma_core.c b/sys/vm/uma_core.c
	--- a/sys/vm/uma_core.c
	+++ b/sys/vm/uma_core.c
	@@ -869,6 +869,8 @@
	*/
	zdom->uzd_nitems += bucket->ub_cnt;
	if (__predict_true(zdom->uzd_nitems < zone->uz_bucket_max)) {
	+ bool head;
	+
	if (ws) {
	zone_domain_imax_set(zdom, zdom->uzd_nitems);
	} else {
	@@ -887,8 +889,14 @@
	/*
	* Try to promote reuse of recently used items. For items
	* protected by SMR, try to defer reuse to minimize polling.
	+ * If KASAN is configured, try to defer reuse to improve UAF
	+ * detection.
	*/
	- if (bucket->ub_seq == SMR_SEQ_INVALID)
	+ head = bucket->ub_seq == SMR_SEQ_INVALID;
	+#ifdef KASAN
	+ head = head && (zone->uz_flags & UMA_ZONE_NOKASAN) != 0;
	+#endif
	+ if (head)
	STAILQ_INSERT_HEAD(&zdom->uzd_buckets, bucket, ub_link);
	else
	STAILQ_INSERT_TAIL(&zdom->uzd_buckets, bucket, ub_link);