[ 1089.931330][T11266] Could not find device with ifindex 2000 in netnsfd 11
[ 1089.932066][T11266] Could not find netns with fd: 2000
[ 1089.932614][T11266] Cannot link a netdevsim to itself
[ 1089.933737][T11266] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).