[ 1030.700666][ T8122] Could not find device with ifindex 2000 in netnsfd 11
[ 1030.701471][ T8122] Could not find netns with fd: 2000
[ 1030.713176][ T8122] Cannot link a netdevsim to itself
[ 1030.714305][ T8122] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).