[ 1182.537921][T10980] Could not find device with ifindex 2000 in netnsfd 11
[ 1182.538686][T10980] Could not find netns with fd: 2000
[ 1182.539253][T10980] netdevsim netdevsim439 eth0: Cannot link a netdevsim to itself
[ 1182.539991][T10980] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).