[ 1199.755679][T10967] Could not find device with ifindex 2000 in netnsfd 11
[ 1199.756647][T10967] Could not find netns with fd: 2000
[ 1199.757605][T10967] Cannot link a netdevsim to itself
[ 1199.758712][T10967] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).