kern/54472: Pressing shift page up while kernel boots cause kernel page fault

[venture37%geeklan.co.uk@localhost]

>Number:         54472
>Category:       kern
>Synopsis:       Pressing shift page up while kernel boots cause kernel page fault
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 16 18:55:00 +0000 2019
>Originator:     Sevan Janiyan
>Release:        HEAD 9.99.7
>Organization:
>Environment:
>Description:
Pressing shift page up continuously while amd64 kernel boots (before DRM has kicked in) on my ThinkPad x230 results in page fault trap, code=0
stopped in pid 0.2 (system) at netbsd:wsdisplay_scroll+0x10: movq 78(%rax),%rcx

db{0}> bt
wsdisplay_scroll() at netbsd:wsdisplay_scroll+0x10
wskbd_translate() at netbsd:wskbd_translate+0xda7
wskbd_input() at netbsd:wskbd_input+0x57
pckbd_input() at netbsd:wskbd_input+0x98
pckbcintr() at netbsd:pckbcintr+0x59
intr_biglock_wrapper() at netbsd:intr_biglock_wrapper+0x36
Xhandle_ioapic_edge1() at netbsd:Xhandle_ioapic_edge1+0x66
--- interrupt ---
sse2_idlezero_page() at netbsd:sse2_idlezero_page+0x40
uvm_pageidlezero() at netbsd:uvm_pageidlezero+0x233
idle_loop() at netbsd:idle_loop+0x1a3

>How-To-Repeat:
Pressing shift page up continuously while kernel boots
>Fix: