[  944.832541][ T8112] Could not find device with ifindex 2000 in netnsfd 11
[  944.833273][ T8112] Could not find netns with fd: 2000
[  944.833819][ T8112] Cannot link a netdevsim to itself
[  944.834541][ T8112] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).