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PS. only one node suffering this, other nodes work well for now.

Please only upgrade 1 minor version at a time for the most stable upgrade path so: 1.25 -> 1.26 -> 1.27 If it's a single node can you just redeploy k3s on the node? Looks like an important directory was deleted the most simple fix would be just to delete and reinstall k3s on the node.

I have noticed that there is a issue/PR related to this problem. https://github.com/k3s-io/k3s/issues/7424 So, I rollback to 1.27.1, and the error disappeared. "If it's a single node can you just redeploy k3s on the node?", how to do this? Do you mean to execute script k3s-agent-uninstall.sh and reinstall k3s-agent? This couldn't be done cause it's in production, contained will be destroyed. I'm wondering why only this node encounter this.