[ 1031.752152][ T8118] Could not find device with ifindex 2000 in netnsfd 11
[ 1031.753130][ T8118] Could not find netns with fd: 2000
[ 1031.753975][ T8118] Cannot link a netdevsim to itself
[ 1031.754676][ T8118] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).