[ 1082.243802][T11100] Could not find device with ifindex 2000 in netnsfd 11
[ 1082.244528][T11100] Could not find netns with fd: 2000
[ 1082.245085][T11100] Cannot link a netdevsim to itself
[ 1082.245760][T11100] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).