[  931.557183][ T7970] Could not find device with ifindex 2000 in netnsfd 11
[  931.558015][ T7970] Could not find netns with fd: 2000
[  931.558783][ T7970] Cannot link a netdevsim to itself
[  931.559791][ T7970] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).