[  950.299573][ T8116] Could not find device with ifindex 2000 in netnsfd 11
[  950.300321][ T8116] Could not find netns with fd: 2000
[  950.300990][ T8116] Cannot link a netdevsim to itself
[  950.301802][ T8116] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).