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net: InterfaceAddrs() "no such network interface" with rapidly changes interfaces #51934
help wanted NeedsInvestigation
Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
What version of Go are you using (
The problem is in Kubernetes v1.23.3 which I think uses go1.17.6, but at least go1.17.x.
Does this issue reproduce with the latest release?
N/A. Have to wait for K8s.
What operating system and processor architecture are you using (
What did you do?
In heavy stress tests on a very large K8s cluster (159 nodes) the update of addresses made by the internal k8s load-balancer (kube-proxy) sometimed (very infrequent) fails to read all addresses with net.InterfaceAddrs. The error is;
The stress test contantly reboot nodes and interfaces are created and removed all the time. At very infrequent times the error above i thrown.
Please see the K8s issue for more info, kubernetes/kubernetes#108065
What did you expect to see?
No interface related errors thrown by net.InterfaceAddrs, even if interfaces are created/removed all the time.
My interpretation is that the error is thrown if net.InterfaceAddrs firsts reads an interface name, then when to read addresses, the interface is gone.
A "no such network interface" must be handled (ignored) internally in net.InterfaceAddrs.
We as a users can of course add re-tries, but how many and for how long? Since interfaces are created/removed all the time we may never be able to read the addresses.
What did you see instead?
The error described above.
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