[ 1078.690440][T11105] Could not find device with ifindex 2000 in netnsfd 11
[ 1078.691517][T11105] Could not find netns with fd: 2000
[ 1078.692487][T11105] Cannot link a netdevsim to itself
[ 1078.693929][T11105] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).