High /vpp/build-data/../vnet/vnet/gre/node.c:360 (gre_input) assertion `(tunnel_sw_if_index) < vec_len (ip4m->fib_index_by_sw_if_index)' fails
Setup:
sudo $vppctl set int ip address tap-0 192.168.1.1/24 sudo $vppctl set int state tap-0 up sudo $vppctl loopback create mac CA:D3:0D:E6:F0:8C sudo $vppctl set interface state loop0 up sudo $vppctl create gre tunnel src 192.168.1.1 dst 192.168.1.2 outer-fib-id 0 sudo $vppctl set interface l2 bridge gre0 13 1 sudo $vppctl set interface l2 bridge loop0 13 bvi sudo $vppctl set interface ip address loop0 10.1.0.1/24
In the crashing case, 'gre0' was the most recent interface created. My initial analysis is that the fib_index_by_sw_index vec is not extended to include the most recent interface until it is set "up", wit:
(gdb) pvec ip4_main->fib_index_by_sw_if_index
$1 = {0, 0, 0, 0, 0, 0, 0}
(gdb) c
Continuing.
DBGvpp# set interface state gre0 up
DBGvpp#
...
(gdb) pvec ip4_main->fib_index_by_sw_if_index
$2 = {0, 0, 0, 0, 0, 0, 0, 0}