[ 1185.621023][T10970] Could not find device with ifindex 2000 in netnsfd 11
[ 1185.621787][T10970] Could not find netns with fd: 2000
[ 1185.622346][T10970] Cannot link a netdevsim to itself
[ 1185.623360][T10970] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).