The SSH connection to the host is extremely slow, the operations on the host are particularly stuck, the deployed docker and kubelet access timeout issues

Fault description

1. There is a host in the environment that I am responsible for that can be pinged, but the ssh connection takes a long time to connect. After logging in, the systemctl status docker, systemctl status kubelet will report a timeout, and other services are also timeout.
2. The top view load is relatively high, and there are 2 zombie processes

Resolution steps

1. View the 2 zombie processes through commands, and what are the specific processes

2. View the 2 zombie processes as shown below.

3. Try to kill these 2 processes. Found that it couldn't be killed at all. Can only kill the parent process, and found that the parent process is 1,
alright. There is no choice but to restart the host.
4. Restart the host and the problem is solved.