NetBSD Problem Report #53808

From  Fri Dec 21 16:34:20 2018
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Date: Fri, 21 Dec 2018 16:34:19 +0000 (UTC)
Subject: efi boot page fault
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>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
>Last-Modified:  Tue Apr 09 15:15:01 +0000 2019
>Originator:     Patrick Welche
>Release:        NetBSD-8.99.27/amd64
source of 20 Dec 2018 10:13 UTC - that includes bootx64.efi - GENERIC kernel.
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



From: Patrick Welche <>
Subject: Re: port-amd64/53808: efi boot page fault
Date: Sun, 23 Dec 2018 21:37:40 +0000

 Just reproduced that page fault with Dec 22 20:41 UTC code on a
 Asus P8Z77-V LX based computer. Advantage that it has a PS/2 keyboard
 and a serial port.

 BIOS Information
         Vendor: American Megatrends Inc.
         Version: 2501
         Release Date: 07/21/2014

From: Patrick Welche <>
Subject: Re: port-amd64/53808: efi boot page fault
Date: Tue, 9 Apr 2019 16:11:03 +0100

 I revisited the intel server. I can reproduce the bug on 8.99.37. It doesn't
 add much to the story, but as USB keyboard input is ignored at the db>
 prompt, I just booted a kernel with "bt" run on entry to ddb:

 efi_getsystbl.part.3() at netbsd:efi_getsystbl.part.3+0x4e
 efi_init() at netbsd:efi_init+0x30
 cpu_configure() at netbsd:cpu_configure+0xe
 main() at netbsd:main+0x301

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