D55525.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
	@@ -7165,6 +7165,12 @@
	/* Assert the required virtual and physical alignment. */
	KASSERT((va & PDRMASK) == 0, ("pmap_enter: va unaligned"));
	KASSERT(m->psind > 0, ("pmap_enter: m->psind < psind"));
	+ /*
	+ * If we made it here and PG_M was not set, set it now. pmap_enter_pde
	+ * requires PG_M to be set if PG_RW is.
	+ */
	+ if ((newpte & PG_RW) != 0)
	+ newpte \|= PG_M;
	rv = pmap_enter_pde(pmap, va, newpte \| PG_PS, flags, m, &lock);
	goto out;
	}