[  653.272551][ T3594] ip (3594) used greatest stack depth: 24080 bytes left
[  656.721720][ T3632] gre: GRE over IPv4 demultiplexor driver
[  656.762001][ T3632] ip_gre: GRE over IPv4 tunneling driver
[  657.169698][ T3639] ip (3639) used greatest stack depth: 23552 bytes left