[mpls-linux-general] Re: [MPLS-Linux] mpls-linux-0.700 : ATM tests & bugs

[James R. L. <jl...@mi...>]

On Thu, Nov 30, 2000 at 12:50:54PM +0100, Olivier Dugeon wrote:
> Hi all,
> 
> I just finish some test with mpls-0.700 over ATM.
> 
> 1/ The code doesn't work like 0.601 for the FORE 200E atm card. You can
> establish connection but when you try to send data (ie. ping) the kernel
> crash :-(( with :
> 
> Nov 30 11:21:20 lat4272 kernel: Unable to handle kernel paging request
> at virtual address 00000084

Do you get an EIP?  Send me the output if you have it, it might be in your
log file /var/log/message

> 2/ The code work with ENI ATM card, even though i notice some bug.
> 
> - When i send ping, there is some info in the kern.log file about
> unknown protocol :
> 
> Nov 30 11:19:24 lat4272 kernel: mpls_output: unknown protocol(0400) 
> Nov 30 11:19:25 lat4272 kernel: mpls_output: unknown protocol(0608) 
> Nov 30 11:19:26 lat4272 kernel: mpls_output: unknown protocol(3781) 
> Nov 30 11:19:27 lat4272 kernel: mpls_output: unknown protocol(3781) 
> Nov 30 11:19:28 lat4272 kernel: mpls_output: unknown protocol(0608) 

This has been an annoyance for sometime now.  The IP stack doesn't
always set the SKB protocol before sending it on.  I need to find
the common path in the IPv4 stack to set that, thus fixing the problem.

> - When i try to delete an incomming label it fail :
> 
> # mplsadm -v -D -I atm:0/50:0
> In label input: atm:0/50:0
> Segmentation fault
> 
> kern.log says :
> 
> Nov 30 13:17:09 lat4271 kernel: mpls_del_in_label: enter 
> Nov 30 13:17:09 lat4271 kernel: __mpls_del_in_label: enter 
> Nov 30 13:17:09 lat4271 kernel: mpls_atm_push: enter 
> Nov 30 13:17:09 lat4271 kernel: Unable to handle kernel NULL pointer
> dereference at virtual address 00000084 
> Nov 30 13:17:09 lat4271 kernel:  printing eip: 
> Nov 30 13:17:09 lat4271 kernel: c024073d 
> Nov 30 13:17:09 lat4271 kernel: *pde = 00000000 
> Nov 30 13:17:09 lat4271 kernel: Oops: 0000 
> Nov 30 13:17:09 lat4271 kernel: CPU:    0 
> 
> And the netlink socket is busy :

Very useful.  I will look into this one.  Could you very that it is
reproducable?

> # mplsadm -v -D -I atm:0/50:0
> rtnl_open: Address already in use
> Netlink: Address already in use
> 
> The incoming label is present both in /proc/net/atm/pvc and
> /proc/net/mpls_in but the LSP is no longer usable.
> 
> - cat /proc/net/atm/svc or cat /proc/net/atm/vc resulted in seg. fault.
> 
> I think there is some pb in the mpls_atm_push routine both for the ENI
> card for LSP deletion and for the FORE 200E card to send data.

I'm tending to agree.

This is a great bug report.  It has everything I need to rtry and tackle
it.  If you could look for the EIP from the FORE crash, I could try and tackle
that as well.

Thanks,
Jim


> Olivier
> 
> P.S. My test scenario and config
> 
> MPLS were compile with TUNNEL and INGRESS POLICY on. ATM card are in the
> kernel no module.
> 
>  ---------             ---------
>  | atm1  |             | atm2  |
>  ---------             ---------
>      |atm0                 |atm0
>      |.31                  |.32
>      +---------------------+
>          192.168.56.0/24
> 
> On atm1:
>   route add -host atm2 gw atm2
>   mplsadm -L atm0:0
>   mplsadm -A -I atm:0/40:0
>   mplsadm -A -B -O atm:0/50:atm0:ipv4:atm2 -f atm2/32
> 
> On B:
>   route add -host atm1 gw atm1
>   mplsadm -L atm0:0
>   mplsadm -A -I atm:0/50:0
>   mplsadm -A -B -O atm:0/40:atm0:ipv4:atm1 -f atm1/32
> 
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-- 
James R. Leu