[ 1120.814340][T11098] Could not find device with ifindex 2000 in netnsfd 11
[ 1120.815756][T11098] Could not find netns with fd: 2000
[ 1120.816704][T11098] Cannot link a netdevsim to itself
[ 1120.817824][T11098] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).