[ 1085.064821][T11109] Could not find device with ifindex 2000 in netnsfd 11
[ 1085.065602][T11109] Could not find netns with fd: 2000
[ 1085.066254][T11109] Cannot link a netdevsim to itself
[ 1085.066905][T11109] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).