diff -ruN ./arch/x86/mm/pgtable.c ../linux-16-to-vz/arch/x86/mm/pgtable.c
--- ./arch/x86/mm/pgtable.c     2018-01-07 04:22:45.057056298 +0100
+++ ../linux-16-to-vz/arch/x86/mm/pgtable.c     2018-01-05 08:13:54.251837657 +0100
@@ -325,8 +325,8 @@
        pgd_mop_up_pmds(mm, pgd);
        pgd_dtor(pgd);
        paravirt_pgd_free(mm, pgd);
-       free_pages((unsigned long)pgd, PGD_ALLOCATION_ORDER);
        mm->nr_ptds--;
+       free_pages((unsigned long)pgd, PGD_ALLOCATION_ORDER);
 }
 
 int ptep_set_access_flags(struct vm_area_struct *vma,