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siderolabs / talos

Talos Linux is a modern Linux distribution built for Kubernetes.
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KernelParamSpecController fails to handle sysctl params that can't be read before being written #9347

Open michaelbeaumont opened 1 month ago

michaelbeaumont commented 1 month ago

Bug Report

On trying to set net.ipv6.conf.enp1s0.stable_secret I see:

user: warning: [2024-09-20T21:23:10.724128463Z]: [talos] controller failed
 {"component": "controller-runtime", "controller":
 "runtime.KernelParamSpecController", "error": "1 error occurred:\n\t* read /
 proc/sys/net/ipv6/conf/enp1s0/stable_secret: input/output error\n\n"}

It appears if this param is read before it's written, it returns input/output error, as described in the commit introducing the param

I solved this by baking it into the kernel params, which is more solid anyway, but the behavior isn't ideal.

Description

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smira commented 1 month ago

Thanks for submitting that, Talos tries to read sysctl to find the value as it was before the change, so that it can revert the change.

Some sysctls don't support this, so we need another way to handle it.