[ 3451.699101][T15021] ip (15021) used greatest stack depth: 23728 bytes left
[ 3452.500838][T15028] gre: GRE over IPv4 demultiplexer driver
[ 3452.522612][T15028] ip_gre: GRE over IPv4 tunneling driver
[ 3489.354706][T15523] ip6_gre: GRE over IPv6 tunneling driver