[ 1224.176649][T11125] Could not find device with ifindex 2000 in netnsfd 11
[ 1224.177338][T11125] Could not find netns with fd: 2000
[ 1224.177909][T11125] Cannot link a netdevsim to itself
[ 1224.178567][T11125] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).