[  621.358313][ T8235] Could not find device with ifindex 2000 in netnsfd 11
[  621.359209][ T8235] Could not find netns with fd: 2000
[  621.359838][ T8235] netdevsim netdevsim446 eth0: Cannot link a netdevsim to itself
[  621.360650][ T8235] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).