[ 1082.856736][T11108] Could not find device with ifindex 2000 in netnsfd 11
[ 1082.857492][T11108] Could not find netns with fd: 2000
[ 1082.858162][T11108] Cannot link a netdevsim to itself
[ 1082.858904][T11108] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).