port-amd64/53808: efi boot page fault

[prlw1%cam.ac.uk@localhost]

>Number:         53808
>Category:       port-amd64
>Synopsis:       efi boot page fault
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Dec 21 16:35:00 +0000 2018
>Originator:     Patrick Welche
>Release:        NetBSD-8.99.27/amd64
>Organization:
>Environment:
source of 20 Dec 2018 10:13 UTC - that includes bootx64.efi - GENERIC kernel.
>Description:
Booting an intel DH67BL based server, trying EFI boot (copied by hand):

total memory = 527 MB
avail memory = 485 MB
running cgd selftest aes-xts-256 aes-xts-512 done
efi: systbl at pa dac0bf18
uvm_fault(0xffffffff8171f9e0, 0xfffff96e4b80b000, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip 0xffffffff8023c9d7 cs 0x8 rflags 0x10246 cr2 0xfffff96e4b80bf28 ilevel 0x8 rsp 0xffffffff81a24e50
curlwp 0xffffffff81657560 pid 0.1 lowest kstack 0xffffffff81a202c0
kernel: page fault trap, code=0
Stopped in pid 0.1 (system) at  netbsd:efi_getsystbl.part.3+0x4e:  movl 1 0(%rbx),%ecx

The server netboots correctly - note difference in memory:
total memory = 16291 MB
avail memory = 15793 MB
timecounter: Timecounters tick every 10.000 msec
Kernelized RAIDframe activated
running cgd selftest aes-xts-256 aes-xts-512 done
...

The BIOS is actually fairly new:
Vendor: Intel Corp.
Version: BLH6710H.86A.0163.2018.1023.1559
Release Date: 10/23/2018


>How-To-Repeat:

>Fix: