[  613.445964][ T8107] Could not find device with ifindex 2000 in netnsfd 11
[  613.446658][ T8107] Could not find netns with fd: 2000
[  613.447217][ T8107] netdevsim netdevsim335 eth0: Cannot link a netdevsim to itself
[  613.459533][ T8107] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).