[    8.956389][  T245] gre: GRE over IPv4 demultiplexer driver
[    8.964993][  T245] ip_gre: GRE over IPv4 tunneling driver
[    9.431240][  T268] ip (268) used greatest stack depth: 24648 bytes left
[   14.701070][  T523] ip (523) used greatest stack depth: 23472 bytes left
[   19.164667][  T736] ip6_gre: GRE over IPv6 tunneling driver