[   36.826489] unregister_netdevice: waiting for ktst-veth to become free. Usage count = 18
[   36.826671] unregister_netdevice: waiting for lo to become free. Usage count = 6
[   36.826722] unregister_netdevice: waiting for ktst-veth to become free. Usage count = 16
[   36.826773] unregister_netdevice: waiting for lo to become free. Usage count = 4
[   43.858715] bench-lookups_i (324) used greatest stack depth: 12592 bytes left