[Olsr-users] OLSRv2 crashing with lan_import

[Bastian Rosner]

Hi,

olsrd2 0.12.1 is crashing on current LEDE x86_64 when using lan_import
on a table which is filled with IPv6-routes by olsrd.

Kernel-message indicating crash:
traps: olsrd2[2719] general protection ip:40aa5e sp:7ffc6d2e3f60 error:0
in olsrd2[400000+5c000]

Without "lan_import", OLSRv2 is running stable.

My setup consists of three KVM LEDE instances, interconnected via
GRETAP-tunnels. Two of three nodes are also running olsrd, on non-GRE
interfaces, talking to our existing olsrdv1 mesh. olsrd is exporting
IPv6 routes to table 100.
The third node is only speaking OLSRv2 on two GRETAP-ifaces and is
supposed to receive a bunch of attached_networks (originally OLSRv1)
from the two other nodes.
The whole exercise is to have a concept of migrating from OLSRv1 to
OLSRv2 in an IPv6-only environment. Routes will obviously only be
redistributed to OLSRv2, not vice-versa.

/etc/config/olsrd2 on dual-stack nodes:
# IPv6-only
config olsrv2
        list 'originator' '-0.0.0.0/0'
        list 'originator' '-::1/128'
        list 'originator' 'default_accept'

# IPv6-only on two GRETAP-tunnels
config interface
        list 'ifname' 'l105'
        list 'ifname' 'a36s'
        option 'rx_bitrate' '1G'
        option 'tx_bitrate' '1G'
        list 'bindto' '-0.0.0.0/0'
        list 'bindto' '-::1'
        list 'bindto' 'default_accept'

# import from table 100 (OLSRv1)
config lan_import
        option name '1'
        list table '100'


Single-stack (OLSRv2 only) looks the same but lan_import section is
disabled.


On the OLSRv2-only node, seconds before olsrd2 on other node is
crashing, logread shows this:

Sun Jul 31 15:55:59 2016 daemon.warn OLSRd2[1359]: 0000: 0825f701
ff07fd20 010bf707 50153200 00000000 000001ff 00edb900 11011001 .%.....
....P.2.................
0020: 92001001 62078002 08900102 b6ad0100 20010bf7 08310007 00000000
00000001 ....b........... ....1..........
0040: 00090710 0220010a 10010b01 0020010b f7083100 0a000000 00000000
01000907 ..... ....... ....1.............
0060: 1002f708 0a100131 01002001 0bf70831 000b0000 00000000 00010009
07100200 .......1.. ....1................
0080: 030a1001 0Sun Jul 31 15:55:59 2016 daemon.warn OLSRd2[1359]:
WARN(rfc5444) e forwarding message: %s (%d) 1063: Error while parsing
incoming packet from [fe80::8cb9:63ff:fe48:fae0]:269%gre-l105: Early end
of packet (-2)
Sun Jul 31 15:55:59 2016 daemon.warn OLSRd2[1359]: 0000: 0825f801
ff080620 010bf707 50153200 00000000 000001ff 00edba00 11011001 .%.....
....P.2.................
0020: 92001001 62078002 08900102 b6ad0100 fd145eca 93530001 00000000
00000001 ....b.............^..S..........
0040: 00090710 0210000a 10010201 10fd1927 8b656700 00000000 00000000
00300009 ...............'.eg..........0..
0060: 07100210 000a1001 020100fd 19278b65 67000100 00000000 00000100
09071002 .............'.eg...............
0080: 10000a10 0

If there's anything else I can provide, please give me some hints on how
to debug.

Cheers, Bastian