[  642.437549][ T3530] ip (3530) used greatest stack depth: 23680 bytes left
[  645.480513][ T3568] gre: GRE over IPv4 demultiplexor driver
[  645.546754][ T3568] ip6_gre: GRE over IPv6 tunneling driver
[  645.841523][ T3574] ip (3574) used greatest stack depth: 23584 bytes left