[ 4335.315346][T29233] gre: GRE over IPv4 demultiplexer driver
[ 4336.941745][T29256] ip_gre: GRE over IPv4 tunneling driver
[ 4389.325928][T29828] ip6_gre: GRE over IPv6 tunneling driver
[ 4406.714092][T30027] ping (30027) used greatest stack depth: 23120 bytes left
[ 4424.300586][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4429.356531][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4433.836552][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4438.893540][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4511.673666][T31210] ping (31210) used greatest stack depth: 22608 bytes left