[ 3955.788506][T19963] gre: GRE over IPv4 demultiplexor driver
[ 3957.868248][T19986] ip_gre: GRE over IPv4 tunneling driver
[ 4017.606670][T20558] ip6_gre: GRE over IPv6 tunneling driver
[ 4038.490896][T20757] ping (20757) used greatest stack depth: 23488 bytes left
[ 4060.255731][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4066.335617][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4071.775579][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4078.047594][    C0] ip6_tunnel: tep0 xmit: Local address not yet configured!