[ 1108.527713][T11112] Could not find device with ifindex 2000 in netnsfd 11
[ 1108.528554][T11112] Could not find netns with fd: 2000
[ 1108.529113][T11112] Cannot link a netdevsim to itself
[ 1108.530105][T11112] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).