[    2.451596] ip (277) used greatest stack depth: 12320 bytes left
[  638.189499] ip (26394) used greatest stack depth: 12160 bytes left
[  686.744297] blackhole_netdev_xmit(): Dropping skb.
[  686.744352] blackhole_netdev_xmit(): Dropping skb.
[  686.744395] blackhole_netdev_xmit(): Dropping skb.
[  686.744430] blackhole_netdev_xmit(): Dropping skb.
[  985.064687] blackhole_netdev_xmit(): Dropping skb.
[  985.064754] blackhole_netdev_xmit(): Dropping skb.
[  985.064788] blackhole_netdev_xmit(): Dropping skb.
[  985.064823] blackhole_netdev_xmit(): Dropping skb.
[ 1044.676040] blackhole_netdev_xmit(): Dropping skb.
[ 1044.676107] blackhole_netdev_xmit(): Dropping skb.
[ 1044.676149] blackhole_netdev_xmit(): Dropping skb.
[ 1044.676202] blackhole_netdev_xmit(): Dropping skb.
[ 1093.664194] blackhole_netdev_xmit(): Dropping skb.
[ 1093.664251] blackhole_netdev_xmit(): Dropping skb.
[ 1093.664283] blackhole_netdev_xmit(): Dropping skb.
[ 1093.664314] blackhole_netdev_xmit(): Dropping skb.
[ 1135.870669] blackhole_netdev_xmit(): Dropping skb.
[ 1135.870728] blackhole_netdev_xmit(): Dropping skb.
[ 1135.870766] blackhole_netdev_xmit(): Dropping skb.
[ 1135.870810] blackhole_netdev_xmit(): Dropping skb.
[ 1140.684185] blackhole_netdev_xmit(): Dropping skb.
[ 1140.684245] blackhole_netdev_xmit(): Dropping skb.
[ 1140.684287] blackhole_netdev_xmit(): Dropping skb.
[ 1140.684338] blackhole_netdev_xmit(): Dropping skb.
[ 1227.939460] blackhole_netdev_xmit(): Dropping skb.
[ 1227.939514] blackhole_netdev_xmit(): Dropping skb.
[ 1227.939548] blackhole_netdev_xmit(): Dropping skb.
[ 1227.939583] blackhole_netdev_xmit(): Dropping skb.