[ 1080.484692][T11100] Could not find device with ifindex 2000 in netnsfd 11
[ 1080.485380][T11100] Could not find netns with fd: 2000
[ 1080.485926][T11100] Cannot link a netdevsim to itself
[ 1080.486586][T11100] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).