[ 1078.847819][T11107] Could not find device with ifindex 2000 in netnsfd 11
[ 1078.848891][T11107] Could not find netns with fd: 2000
[ 1078.849797][T11107] Cannot link a netdevsim to itself
[ 1078.850978][T11107] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).