[ 1219.653870][T11130] Could not find device with ifindex 2000 in netnsfd 11
[ 1219.654589][T11130] Could not find netns with fd: 2000
[ 1219.655213][T11130] Cannot link a netdevsim to itself
[ 1219.656127][T11130] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).