[ 1176.186040][T10981] Could not find device with ifindex 2000 in netnsfd 11
[ 1176.186797][T10981] Could not find netns with fd: 2000
[ 1176.187380][T10981] netdevsim netdevsim381 eth0: Cannot link a netdevsim to itself
[ 1176.188142][T10981] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).