[ 4520.472933][T21896] gre: GRE over IPv4 demultiplexer driver
[ 4522.336224][T21919] ip_gre: GRE over IPv4 tunneling driver
[ 4571.288101][T22493] ip6_gre: GRE over IPv6 tunneling driver
[ 4588.116838][T22692] ping (22692) used greatest stack depth: 23472 bytes left
[ 4605.148092][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4610.012083][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4614.492033][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4619.548071][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!