i386/105204: net/mpd causes a kernel freeze

[Gonzalo A. Arana]

>Number:         105204
>Category:       i386
>Synopsis:       net/mpd causes a kernel freeze
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Nov 06 12:20:42 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Gonzalo A. Arana
>Release:        6.1-RELEASE
>Organization:
>Environment:
FreeBSD freebsd.arana 6.1-RELEASE FreeBSD 6.1-RELEASE #0: Sun Nov  5 09:13:36 ART 2006     root at freebsd.arana:/usr/obj/usr/src/sys/ARANA  i386
>Description:
when I open a pptp tunel with net/mpd, my machine freezes (numlock does not respond, for instance).  I've compiled a new kernel without USB and SCSI/RAID controller support.

Here are the relevant configuration files:
/usr/local/etc/mpd/mpd.conf:

default:
        load vpn

vpn:
        new -i ng0 vpn vpn
        set iface disable on-demand
        set iface idle 0
# disconnect the client after 8 hours
        set iface session 28800
        #set iface route 192.168.2.0/24
        set bundle disable multilink
        set bundle authname my_username
        set bundle password my_password
        set link yes acfcomp protocomp
        set link no pap chap
        set link accept pap
        set link mtu 1460
# If remote machine is NT you need this..
#       set link enable no-orig-auth
        set link keep-alive 10 75
        set ipcp no vjcomp

/usr/local/etc/mpd/mpd.links:
vpn:
        set link type pptp
        set pptp self ZZZ
        set pptp peer YYY
        set pptp enable originate incoming outcall
        set pptp disable windowing


where:
   ZZZ my ethernet IP address
   YYY ip address of TCP peer

>How-To-Repeat:
run: 
when I type 'open' inside mpd shell, and after tunnel is UP, the machine freezes.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: