[    1.607414] ip (242) used greatest stack depth: 12352 bytes left
[    2.010082] ip (276) used greatest stack depth: 12320 bytes left
[    9.676544] ip (1086) used greatest stack depth: 12160 bytes left
[  649.764060] blackhole_netdev_xmit(): Dropping skb.
[  649.764130] blackhole_netdev_xmit(): Dropping skb.
[  649.764160] blackhole_netdev_xmit(): Dropping skb.
[  649.764185] blackhole_netdev_xmit(): Dropping skb.
[ 1010.525814] blackhole_netdev_xmit(): Dropping skb.
[ 1010.525889] blackhole_netdev_xmit(): Dropping skb.
[ 1010.525936] blackhole_netdev_xmit(): Dropping skb.
[ 1010.525984] blackhole_netdev_xmit(): Dropping skb.
[ 1114.097759] blackhole_netdev_xmit(): Dropping skb.
[ 1114.097832] blackhole_netdev_xmit(): Dropping skb.
[ 1114.097879] blackhole_netdev_xmit(): Dropping skb.
[ 1114.097939] blackhole_netdev_xmit(): Dropping skb.