[  497.433081][ T4586] gre: GRE over IPv4 demultiplexor driver
[  497.451050][ T4586] ip_gre: GRE over IPv4 tunneling driver
[  498.602566][ T4609] ip (4609) used greatest stack depth: 23408 bytes left
[  521.603017][ T4984] ip6_gre: GRE over IPv6 tunneling driver