D52733.diff
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	diff --git a/sys/vm/vm_domainset.c b/sys/vm/vm_domainset.c
	--- a/sys/vm/vm_domainset.c
	+++ b/sys/vm/vm_domainset.c
	@@ -113,7 +113,6 @@
	int d;

	d = di->di_offset % di->di_domain->ds_cnt;
	- *di->di_iter = d;
	*domain = di->di_domain->ds_order[d];
	}

	@@ -260,9 +259,14 @@
	* are immutable and unsynchronized. Updates can race but pointer
	* loads are assumed to be atomic.
	*/
	- if (obj != NULL && obj->domain.dr_policy != NULL)
	+ if (obj != NULL && obj->domain.dr_policy != NULL) {
	+ /*
	+ * This write lock protects non-atomic increments of the
	+ * iterator index in vm_domainset_iter_rr().
	+ */
	+ VM_OBJECT_ASSERT_WLOCKED(obj);
	dr = &obj->domain;
	- else
	+ } else
	dr = &curthread->td_domain;

	vm_domainset_iter_init(di, dr->dr_policy, &dr->dr_iter, obj, pindex);