[ 1250.871237][T10981] Could not find device with ifindex 2000 in netnsfd 11
[ 1250.872021][T10981] Could not find netns with fd: 2000
[ 1250.872598][T10981] Cannot link a netdevsim to itself
[ 1250.873313][T10981] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).