kernel land ppp makes mage fault

[Anatoli Marinov]

Hi,
I try to use pptp (pptpclient) and ppp connection to my ISP with FreeBSD 
6-STABLE. 
If I compile pptp from ports after installation it works in user land and 
consume 50-60% from my CPU time (for 200 KB/sec). 
Before 6-STABLE with 6-TESTx and RCx my pptp, compiled to use kernel level ppp 
works great, but with 6-STABLE after 5 to 10 minutes I have page fault and 
reboot.
pptpclient from ports by default compiles to work with user land ppp but with 
simple changes in Makefile I compile it to work with kernel level ppp. 

Would you help me how can I use pptp with kernel level ppp and FreeBSD 
6-STABLE?