port-arm/55969: l->l_stat == LSONPROC assertion failure during boot

[yamt9999%gmail.com@localhost]

>Number:         55969
>Category:       port-arm
>Synopsis:       l->l_stat == LSONPROC assertion failure during boot
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-arm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 01 10:40:00 +0000 2021
>Originator:     YAMAMOTO Takashi
>Release:        current
>Organization:
>Environment:
kingcrab# uname -a
NetBSD kingcrab 9.99.79 NetBSD 9.99.79 (GENERIC) #0: Wed Jan 27 12:06:10 UTC 2021  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/evbarm/compile/GENERIC evbarm
kingcrab#

raspberry pi 3 model a+
>Description:
"l->l_stat == LSONPROC" assertion failure in kern_sleepq.c line 227 during boot.

hand-written backtrace:
vpanic
__aeabi_uldivmod
sleepq_enqueue
cv_wait
xc_wait
percpu_backend_alloc
vmem_xalloc
vmem_alloc
percpu_create
pic_add
bcm2836mp_intr_init
arm_fdt_cpu_hatch
cpu_hatch

config:

  include arch/evbarm/conf/GENERIC
  makeoptions DEBUG="-g"
  no options INET6
  options DEBUG
  options DIAGNOSTIC
  options LOCKDEBUG
  options MBUFTRACE

>How-To-Repeat:

>Fix: