[ 3959.851156][T19919] gre: GRE over IPv4 demultiplexor driver
[ 3961.849779][T19943] ip_gre: GRE over IPv4 tunneling driver
[ 4022.289215][T20515] ip6_gre: GRE over IPv6 tunneling driver
[ 4049.410205][T20764] ping (20764) used greatest stack depth: 23232 bytes left
[ 4065.286896][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4071.110826][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4076.102835][    C0] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4081.991849][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!