[ 1387.660683][ T3989] gre: GRE over IPv4 demultiplexor driver
[ 1387.679081][ T3989] ip_gre: GRE over IPv4 tunneling driver
[ 1388.065579][ T3995] ip (3995) used greatest stack depth: 23864 bytes left
[ 1391.093724][ T4023] ip (4023) used greatest stack depth: 23328 bytes left