[  554.537737][ T3660] gre: GRE over IPv4 demultiplexer driver
[  554.545523][ T3660] ip_gre: GRE over IPv4 tunneling driver
[  554.587420][ T3659] ip (3659) used greatest stack depth: 23912 bytes left
[  555.117364][ T3684] ip (3684) used greatest stack depth: 23592 bytes left