ng_pptpgre + netmask_change results to lock

[Julian Elischer]

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? 
(Assuming you have the debugger in your kernel?). 
Does it still ping?

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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