[ 1081.114673][T11112] Could not find device with ifindex 2000 in netnsfd 11
[ 1081.115346][T11112] Could not find netns with fd: 2000
[ 1081.115924][T11112] Cannot link a netdevsim to itself
[ 1081.116596][T11112] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).