[ 1194.072024][T11149] Could not find device with ifindex 2000 in netnsfd 11
[ 1194.072677][T11149] Could not find netns with fd: 2000
[ 1194.073193][T11149] netdevsim netdevsim403 eth0: Cannot link a netdevsim to itself
[ 1194.073950][T11149] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).