ng_pptpgre + netmask_change results to lock

Hello everybody,

I just managed to lock my box and I want to report it
in case it's known(or it helps in some way). It is a
6.2-STABLE from March 13. The procedure that triggers
the lock is simple:

1) Create a pptp tunnel.
2) Set is as your default gateway.
3) Play a bit with the netmask of the physical inteface.
In my case doing a few times:
ifconfig fxp0 192.168.1.71/16
ifconfig fxp0 192.168.1.71/24
locks the box.

It's the GENERIC kernel along with:
nik:0:~$ kldstat
Id Refs Address Size Name
1 16 0xc0400000 70b690 kernel
2 1 0xc0b0c000 5fa0 snd_ich.ko
3 2 0xc0b12000 22c48 sound.ko
4 1 0xc0b35000 598bc acpi.ko
5 1 0xc3863000 2000 green_saver.ko
6 1 0xc38b7000 4000 ng_socket.ko
7 8 0xc38bb000 a000 netgraph.ko
8 1 0xc38cd000 3000 ng_iface.ko
9 1 0xc38d8000 6000 ng_ppp.ko
10 1 0xc38f0000 4000 ng_vjc.ko
11 1 0xc38f6000 4000 ng_bpf.ko
12 1 0xc38fd000 2000 ng_tcpmss.ko
13 1 0xc38ff000 4000 ng_pptpgre.ko
14 1 0xc3903000 4000 ng_ksocket.ko

Anybody with a more recent -STABLE can confirm that
the problem is still there? or not?
Any thoughts before updating my /usr/src?

Thanks in advance, Nikos
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