why "PHYSICAL" does not match "PMD entry" value?

[leveryd]

[root@instance-fj5pftdp ~]# crash -v

crash 7.2.3-11.el7_9.1

crash> vtop ffffffff80000000
VIRTUAL           PHYSICAL
ffffffff80000000  e4e00000

PGD DIRECTORY: ffffffffb2c10000
PAGE DIRECTORY: 117a14067
   PUD: 117a14ff0 => 117a15063
   PMD: 117a15000 => 0   // PMD entry

as linux kernel documentation, 0xffffffff80000000 will be mapped to physical address 0, but why it shows "e4e00000" as actual and why "PHYSICAL"(e4e00000) does not match "PMD entry"(0) value?

[k-hagio]

The e4e00000 is calculated using phys_base, which varies with machine, KASLR, etc. It looks like the page is not mapped on your machine.