Re: [mpls-linux-general] Crash in getifaddrs() when using a mpls-enabled kernel

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

If I understand correctly, you're saying that tcpdump is crashing when
it tries to decode MPLS packets on the receive side?

On Mon, Apr 18, 2005 at 02:19:21PM +0200, Vincent Untz wrote:
> Hi,
>=20
> I'm experiencing the problem described in
> http://sourceforge.net/mailarchive/forum.php?thread_id=3D6272612&forum_id=
=3D5051
>=20
> In order to make sure I was not doing something wrong, I installed a
> stock fedora core 2, used the rpm provided on the mpls-linux project
> page.
>=20
> Here are the steps to reproduce the crash:
>=20
> [root@tom3 root]# cat /sys/mpls/version
> 1.946
> [root@tom3 root]# mpls labelspace add dev eth0 labelspace 0
> [root@tom3 root]# mpls ilm add label gen 10000 labelspace 0
> [root@tom3 root]# mpls ilm show
> ILM entry label gen 10000 labelspace 0 proto ipv4
>         pop peek  (0 bytes, 0 pkts, 0 dropped)
> [root@tom3 root]# tcpdump
> Aborted
> [root@tom3 root]# tcpdump -i eth0
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
> ...
> [root@tom3 root]# mpls ilm del label gen 10000 labelspace 0
> [root@tom3 root]# tcpdump
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
> ...
>=20
> Here's a stack trace:
> (gdb) bt
> #0  0xffffe410 in ?? ()
> #1  0xbffff5b8 in ?? ()
> #2  0x00000006 in ?? ()
> #3  0x00000c9e in ?? ()
> #4  0xb7eebe59 in raise () from /lib/tls/libc.so.6
> #5  0xb7eed882 in abort () from /lib/tls/libc.so.6
> #6  0xb7f9d3fb in getifaddrs () from /lib/tls/libc.so.6
> #7  0x0808bedd in error ()
> #8  0x0808d0b9 in pcap_setnonblock_fd ()
> #9  0x08081264 in ?? ()
> #10 0xbffff8c0 in ?? ()
> #11 0xbffffa74 in ?? ()
> #12 0x080b14a8 in _IO_stdin_used ()
> #13 0x00000000 in ?? ()
>=20
> I can always reproduce this. Is there anything I can do to help?
>=20
> Thanks,
>=20
> Vincent
>=20
> --=20
> Les gens heureux ne sont pas press??s.



--=20
James R. Leu
jl...@mi...