D27498.diff
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	Index: head/sys/kern/kern_cpuset.c
	===================================================================
	--- head/sys/kern/kern_cpuset.c
	+++ head/sys/kern/kern_cpuset.c
	@@ -207,9 +207,13 @@
	{
	cpusetid_t id;

	- if (refcount_release(&set->cs_ref) == 0)
	+ if (refcount_release_if_not_last(&set->cs_ref))
	return;
	mtx_lock_spin(&cpuset_lock);
	+ if (!refcount_release(&set->cs_ref)) {
	+ mtx_unlock_spin(&cpuset_lock);
	+ return;
	+ }
	LIST_REMOVE(set, cs_siblings);
	id = set->cs_id;
	if (id != CPUSET_INVALID)
	@@ -229,9 +233,13 @@
	cpuset_rel_defer(struct setlist head, struct cpuset set)
	{

	- if (refcount_release(&set->cs_ref) == 0)
	+ if (refcount_release_if_not_last(&set->cs_ref))
	return;
	mtx_lock_spin(&cpuset_lock);
	+ if (!refcount_release(&set->cs_ref)) {
	+ mtx_unlock_spin(&cpuset_lock);
	+ return;
	+ }
	LIST_REMOVE(set, cs_siblings);
	if (set->cs_id != CPUSET_INVALID)
	LIST_REMOVE(set, cs_link);