kern/45830: reading :dev/mem panics an i386 domU

[manu%netbsd.org@localhost]

>Number:         45830
>Category:       kern
>Synopsis:       reading :dev/mem panics an i386 domU
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 13 09:10:00 +0000 2012
>Originator:     Emmanuel Dreyfus
>Release:        NetBSD-5.1
>Organization:
NetBSD
>Environment:
NetBSD bacasable.net.espci.fr 5.1_STABLE NetBSD 5.1_STABLE (XEN3_DOMU_PUFFS) 
#352: Fri Jan 13 10:00:13 CET 2012  
root%mai.net.espci.fr@localhost:/usr/src-5/sys/arch/i386/compile/obj/XEN3_DOMU_PUFFS
 i386

>Description:
Reading /dev/mem crashes the kernel
>How-To-Repeat:
As root:
cat /dev/mem > /dev/null
>Fix: