D23719.id68421.diff
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	Index: head/sys/kern/kern_synch.c
	===================================================================
	--- head/sys/kern/kern_synch.c
	+++ head/sys/kern/kern_synch.c
	@@ -368,8 +368,8 @@
	/*
	* Last reference. Signal the user to call the destructor.
	*
	- * Ensure that the destructor sees all updates. The fence_rel
	- * at the start of refcount_releasen synchronizes with this fence.
	+ * Ensure that the destructor sees all updates. This synchronizes
	+ * with release fences from all routines which drop the count.
	*/
	atomic_thread_fence_acq();
	return (true);
	Index: head/sys/sys/refcount.h
	===================================================================
	--- head/sys/sys/refcount.h
	+++ head/sys/sys/refcount.h
	@@ -119,6 +119,9 @@
	KASSERT(n < REFCOUNT_SATURATION_VALUE / 2,
	("refcount_releasen: n=%u too large", n));

	+ /*
	+ * Paired with acquire fence in refcount_release_last.
	+ */
	atomic_thread_fence_rel();
	old = atomic_fetchadd_int(count, -n);
	if (__predict_false(n >= REFCOUNT_COUNT(old) \|\|
	@@ -198,6 +201,9 @@
	return (false);
	if (__predict_false(REFCOUNT_SATURATED(old)))
	return (true);
	+ /*
	+ * Paired with acquire fence in refcount_release_last.
	+ */
	if (atomic_fcmpset_rel_int(count, &old, old - 1))
	return (true);
	}