[  929.523771][ T7970] Could not find device with ifindex 2000 in netnsfd 11
[  929.524466][ T7970] Could not find netns with fd: 2000
[  929.525005][ T7970] Cannot link a netdevsim to itself
[  929.525690][ T7970] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).