[    2.203890] gre: GRE over IPv4 demultiplexer driver
[    2.205576] ip_gre: GRE over IPv4 tunneling driver
[    2.207771] modprobe (195) used greatest stack depth: 12480 bytes left
[    2.596817] ip (319) used greatest stack depth: 12368 bytes left
[    2.938922] ip (424) used greatest stack depth: 12336 bytes left
[    3.678818] ip6_gre: GRE over IPv6 tunneling driver