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Index: sys/amd64/amd64/pmap.c
===================================================================
--- sys/amd64/amd64/pmap.c
+++ sys/amd64/amd64/pmap.c
@@ -5058,6 +5058,8 @@
vm_page_aflag_set(om, PGA_REFERENCED);
CHANGE_PV_LIST_LOCK_TO_PHYS(&lock, opa);
pv = pmap_pvh_remove(&om->md, pmap, va);
+ KASSERT(pv != NULL,
+ ("pmap_enter: no PV entry for %#lx", va));
if ((newpte & PG_MANAGED) == 0)
free_pv_entry(pmap, pv);
if ((om->aflags & PGA_WRITEABLE) != 0 &&
Index: sys/i386/i386/pmap.c
===================================================================
--- sys/i386/i386/pmap.c
+++ sys/i386/i386/pmap.c
@@ -3820,6 +3820,8 @@
if ((origpte & PG_A) != 0)
vm_page_aflag_set(om, PGA_REFERENCED);
pv = pmap_pvh_remove(&om->md, pmap, va);
+ KASSERT(pv != NULL,
+ ("pmap_enter: no PV entry for %#x", va));
if ((newpte & PG_MANAGED) == 0)
free_pv_entry(pmap, pv);
if ((om->aflags & PGA_WRITEABLE) != 0 &&

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