port-vax/56360: NetBSD/vax install media boot failed in simh/microvax3900 set 512MB ram

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>Number:         56360
>Category:       port-vax
>Synopsis:       NetBSD/vax install media boot failed in simh/microvax3900 set 512MB ram
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-vax-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Aug 14 03:55:00 +0000 2021
>Originator:     DavyCrockett
>Release:        
>Organization:
>Environment:
>Description:
[ 2.8000080] r0=80322600 r1=80322580 r2=9fe45580 r3=00000000 r4=80ccb160 r5=00000000 r6=9fbbb688
r7=80322600
[ 2.8000080] r8=00000000 r9=00000001 r10=00000001 r11=9fbbb69c
[ 2.8000080] ap=a71ecd58 fp=a71ecd44 sp=7fff96ac pc=800144a5
[ 2.8000080] panic: SEGV in kernel mode: pc 0x800144a5 addr 0xbedababe
[ 2.8000080] cpu0: Begin traceback...
[ 2.8000080] panic: SEGV in kernel mode: pc 0x800144a5 addr 0xbedababe
[ 2.8000080] Stack traceback :
[ 2.8000080] Process is executing in user space.
[ 2.8000080] cpu0: End traceback...
Stopped in pid 3.1 (ls) at netbsd:vpanic+0x171: pushl $0
>How-To-Repeat:
use simh https://github.com/simh/simh/ 's microvax3900 simulator with script follow
set cpu 512M
set cpu idle=netbsd
set rq1 cdrom
attach rq1 nbsdvax.iso
set rq0 rauser=16384
attach rq0 nbsdvax.img
attach nvr vax.nvr
attach xq0 nat:tcp=65533:10.0.2.15:22
boot cpu
and nbsdvax.iso is https://nycdn.netbsd.org/pub/NetBSD-daily/netbsd-9/latest/images/NetBSD-9.2_STABLE-vax.iso
>Fix: