[ 1084.471229][T11107] Could not find device with ifindex 2000 in netnsfd 11
[ 1084.472009][T11107] Could not find netns with fd: 2000
[ 1084.472641][T11107] Cannot link a netdevsim to itself
[ 1084.473759][T11107] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).