[ 1084.194222][T11110] Could not find device with ifindex 2000 in netnsfd 11
[ 1084.194911][T11110] Could not find netns with fd: 2000
[ 1084.195455][T11110] Cannot link a netdevsim to itself
[ 1084.196390][T11110] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).