[ 1090.895438][T10963] Could not find device with ifindex 2000 in netnsfd 11
[ 1090.896601][T10963] Could not find netns with fd: 2000
[ 1090.897489][T10963] Cannot link a netdevsim to itself
[ 1090.898544][T10963] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).