kern/52132: Reboot when "shutdown -p now" command is done.

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>Number:         52132
>Category:       kern
>Synopsis:       Reboot when "shutdown -p now" command is done.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Apr 03 09:05:01 +0000 2017
>Originator:     Yuuki Enomoto
>Release:        netbsd-7-1-RELEASE
>Organization:
Chitose Institute of Science and Technology
>Environment:
NetBSD  7.1 NetBSD 7.1 (GENERIC) #1: Mon Apr  3 16:48:52 UTC 2017  root@localhost:/usr/obj/sys/arch/amd64/compile/GENERIC amd64
>Description:
I'm using NetBSD-7.1-RELEASE on Thinkpad X201i.
I updated from version 7.0.2 to version 7.1 using build.sh.
After that, machine reboots when "shutdown -p now" command is done.
The following is part of dmesg's output.

uvm_fault(0xfffffe8107e5acf0, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff804af70a cs 8 rflags 10246 cr2 20 ilevel 0 rsp fffffe8
040a24d08
curlwp 0xfffffe812c34e020 pid 258.1 lowest kstack 0xfffffe8040a222c0
Skipping crash dump on recursive panic
panic: trap
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
snprintf() at netbsd:snprintf
startlwp() at netbsd:startlwp
alltraps() at netbsd:alltraps+0x96
wm_detach() at netbsd:wm_detach+0x9b
config_detach() at netbsd:config_detach+0x8b
config_detach_all() at netbsd:config_detach_all+0x91
cpu_reboot() at netbsd:cpu_reboot+0x16e
sys_reboot() at netbsd:sys_reboot+0x7e
syscall() at netbsd:syscall+0x9a
--- syscall (number 208) ---
7f7ff703c99a:
cpu0: End traceback...
rebooting...

>How-To-Repeat:
Thinkpad X201i
>Fix:
Unknown