[ 1029.732307][ T8117] Could not find device with ifindex 2000 in netnsfd 11
[ 1029.733387][ T8117] Could not find netns with fd: 2000
[ 1029.734260][ T8117] Cannot link a netdevsim to itself
[ 1029.735715][ T8117] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).