[ 1185.292695][T10984] Could not find device with ifindex 2000 in netnsfd 11
[ 1185.294425][T10984] Could not find netns with fd: 2000
[ 1185.294981][T10984] netdevsim netdevsim337 eth0: Cannot link a netdevsim to itself
[ 1185.295745][T10984] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).