[ 1090.970455][T11226] Could not find device with ifindex 2000 in netnsfd 11
[ 1090.971654][T11226] Could not find netns with fd: 2000
[ 1090.972548][T11226] Cannot link a netdevsim to itself
[ 1090.973628][T11226] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).