fresh k3s install k3s-server process high cpu and failed to response to kubectl

[jli3388]

Environmental Info:
K3s Version: v1.20.0+k3s2

Node(s) CPU architecture, OS, and Version: Linux k0 5.4.83-v7l+ #1379 SMP Mon Dec 14 13:11:54 GMT 2020 armv7l GNU/Linux

Cluster Configuration: 1 master, 5 workers. All raspberry pi 4.

Describe the bug:
Fresh installation afterwards on the server node, k3s-server would stay on around 100+% cpu and it fails to answer any kubectl command.

Steps To Reproduce:

1. uninstalled old k3s installation using "k3s-uninstall.sh" (https://rancher.com/docs/k3s/latest/en/installation/uninstall/).
2. find . -type d | grep rancher | xargs rm -Rf (manually remove any directory on the system that has the word "rancher" on it. )
3. follow the install doc to make sure the node uses legacy iptables.
4. curl -sfL https://get.k3s.io | sh -
5. k3s --debug kubectl get nodes <--- would simply hangs..

• Installed K3s: curl -sfL https://get.k3s.io | sh -

Expected behavior:

• k3s kubectl get nodes <--- should returns at least showing master node before I register any worker nodes.
• k3s-server shouldn't consistently on high cpu usage.

Actual behavior:

• k3s-server didn't start properly
• k3s-server failed to communicate with kubectl.

Additional context / logs:

[jli3388]

journalctl.log - log tail while I run the k3s server installation
k3s-install-screen-shot.txt - the screen that shows my installation command and the output from the screen
k3s-kubectl-hangs.txt - run with --debug, but not much output

[i5Js]

Downgrade to 1.19 or wait till 1.20.2, There is a known issue with v1.20 on arm caused by a golang compiler issue. v1.20.2 will include a workaround: kubernetes/kubernetes#97685

[rancher-max]

Watching k3s-server with top consistently shows below 10% usage on my raspberrypi 4 using commit 6e768c301e77738ffd69934363aa0479c4a516d6. I am also able to execute kubectl commands successfully, including deploying, removing, etc.