[ 1002.711073][ T7975] Could not find device with ifindex 2000 in netnsfd 11
[ 1002.711825][ T7975] Could not find netns with fd: 2000
[ 1002.712369][ T7975] Cannot link a netdevsim to itself
[ 1002.713341][ T7975] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).