port-xen/47720: Kernel Panic on dom0 shutdown or reboot when using RAIDframe

[kimtwain0%gmail.com@localhost]

>Number:         47720
>Category:       port-xen
>Synopsis:       Kernel Panic on dom0 shutdown or reboot when using RAIDframe
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-xen-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 05 23:15:00 +0000 2013
>Originator:     Kim fantasyname Twain
>Release:        6.0.1
>Organization:
>Environment:
NetBSD netbsdxen.home 6.0.1 NetBSD 6.0.1 (XEN3_DOM0) amd64
>Description:
Issuing a shutdown or reboot on NetBSD running in a XEN dom0, with an active 
raid1 array, causes a kernel panic and a forced root filesystem check on 
reboot, and the array parity status may become dirty. The array doesn't contain 
any mounted filesystem.

Screenshot of the kernel panic occurring in virtualbox: 

https://lh6.googleusercontent.com/-WTqK2kPydh0/UV9THX5Z7GI/AAAAAAAAAkI/CAWP2P3Pwe0/s800/Schermata+2013-04-06+alle+00.40.42+1.png
>How-To-Repeat:
1. Install NetBSD 6.0.1 on wd0
2. Create a RAIDframe array (raid1) using wd1 and wd2
3. Install xentools41, xenkernel41 and extract netbsd-XEN3_DOM0.gz (version 
6.0.1) as /netbsd.dom0
4. Add 
"xenbackendd=YES
xend=YES
xendomains=YES
xenwatchdog=YES" to /etc/rc.conf
5. Create a new entry in /boot.cfg menu=Xen:load /netbsd.dom0 
console=pc;multiboot /usr/pkg/xen41-kernel/xen.gz dom0_mem=256M
6. Reboot into xen
7. Issue a shutdown or a reboot
>Fix: