D49442.diff
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	diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
	--- a/sys/amd64/amd64/pmap.c
	+++ b/sys/amd64/amd64/pmap.c
	@@ -9292,6 +9292,11 @@
	va = va_next;
	for (pte = pmap_pde_to_pte(pde, sva); sva != va_next; pte++,
	sva += PAGE_SIZE) {
	+ /*
	+ * Avoid clearing the accessed bit for wired mappings.
	+ * Superpage demotion assumes that a wired mapping is
	+ * always accessed.
	+ */
	if ((*pte & (PG_MANAGED \| PG_V)) != (PG_MANAGED \| PG_V))
	goto maybe_invlrng;
	else if ((*pte & (PG_M \| PG_RW)) == (PG_M \| PG_RW)) {
	@@ -9304,8 +9309,9 @@
	m = PHYS_TO_VM_PAGE(*pte & PG_FRAME);
	vm_page_dirty(m);
	}
	- atomic_clear_long(pte, PG_M \| PG_A);
	- } else if ((*pte & PG_A) != 0)
	+ atomic_clear_long(pte, PG_M \|
	+ ((*pte & PG_W) == 0 ? PG_A : 0));
	+ } else if ((*pte & (PG_A \| PG_W)) == PG_A)
	atomic_clear_long(pte, PG_A);
	else
	goto maybe_invlrng;