Re: ng_pptpgre + netmask_change results to lock

On Monday 28 May 2007 10:57, Julian Elischer wrote:
Nikos Vassiliadis wrote:
On Tuesday 22 May 2007 10:06, I wrote:
Hello everybody,

I just managed to lock my box and I want to report it

define "lock"?

Does it still respond to <CTL><ALT><ESC> on the keyboard?

No, but I was trying to break to the debugger with
<Control><PrintScreen> myself. I assume that it is
equivalent to the combination you wrote, or not?

(Assuming you have the debugger in your kernel?).

Yes, I have included my kernel configuration, see bellow.

Does it still ping?

no, ARP does not work as well.


Sometimes these still respond even though the rest of the system appears
dead.

in case it's known(or it helps in some way). It is a
6.2-STABLE from March 13.

I did update to RELENG_6.

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.

I also have to mention that the PPTP
server is not on 192.168.1.0/24.

My kernel cf contains:
options KDB
options DDB
options INVARIANTS
options INVARIANT_SUPPORT
options WITNESS
options WITNESS_KDB
options DEBUG_LOCKS
options DIAGNOSTIC
options SOCKBUF_DEBUG
options BREAK_TO_DEBUGGER

options NETGRAPH
options NETGRAPH_DEBUG
and several netgraph nodes.

I still cannot break to the debugger, is there anything
else I should add to my kernel cf?

root:0:~# ngctl list
There are 19 total nodes:
Name: ngctl18236 Type: socket ID: 0000003c Num
hooks: 0 Name: <unnamed> Type: pppoe ID: 00000037
Num hooks: 2 Name: <unnamed> Type: socket ID: 00000036
Num hooks: 1 Name: mpd1899-sam-bpf Type: bpf ID: 00000035
Num hooks: 5 Name: mpd1899-sam-vjc Type: vjc ID:
00000034 Num hooks: 4 Name: mpd1899-sam Type: ppp
ID: 00000033 Num hooks: 7 Name: ng1 Type: iface
ID: 00000032 Num hooks: 2 Name: mpd1899-sam-so Type: socket
ID: 00000031 Num hooks: 2 Name: <unnamed> Type: socket
ID: 00000030 Num hooks: 0 Name: <unnamed> Type: ksocket
ID: 0000002f Num hooks: 1 Name: <unnamed> Type: pptpgre
ID: 0000002e Num hooks: 2 Name: mpd1899-mss Type: tcpmss
ID: 0000002d Num hooks: 4 Name: mpd1899-vpn-bpf Type: bpf
ID: 0000002c Num hooks: 5 Name: mpd1899-vpn-vjc Type: vjc
ID: 0000002b Num hooks: 4 Name: mpd1899-vpn Type: ppp
ID: 0000002a Num hooks: 8 Name: ng0 Type: iface
ID: 00000029 Num hooks: 2 Name: mpd1899-vpn-so Type:
socket ID: 00000028 Num hooks: 2 Name: fxp0
Type: ether ID: 00000002 Num hooks: 0 Name: rl0
Type: ether ID: 00000001 Num hooks: 1

Any ideas what to do next?

Thanks in advance, Nikos
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