[ 3941.067596][T29640] gre: GRE over IPv4 demultiplexor driver
[ 3942.685098][T29663] ip_gre: GRE over IPv4 tunneling driver
[ 3990.117594][T30235] ip6_gre: GRE over IPv6 tunneling driver
[ 4017.826289][T30578] ping (30578) used greatest stack depth: 23440 bytes left
[ 4022.915477][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4027.714440][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4031.874430][    C0] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4036.802533][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!