[ 1083.262708][T11112] Could not find device with ifindex 2000 in netnsfd 11
[ 1083.263834][T11112] Could not find netns with fd: 2000
[ 1083.264685][T11112] Cannot link a netdevsim to itself
[ 1083.266007][T11112] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).