[  933.234486][ T8114] Could not find device with ifindex 2000 in netnsfd 11
[  933.235245][ T8114] Could not find netns with fd: 2000
[  933.235844][ T8114] Cannot link a netdevsim to itself
[  933.236597][ T8114] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).