Hi,
Today, we found that there was a error mesage raised from felix process as below.
did you have any idea what is going wrong?
“PANIC felix/iface_monitor.go 134: Failed to read events from Netlink”
That will be Felix failing to read events from Netlink 
What’s special about your installation? How did you install Calico? what’s the Node OS? etc. Ideally you’d give us enough information to reproduce the issue.
I recommend talking to us on slack (for fastest response) or a github issue in GitHub - projectcalico/calico: Cloud native networking and network security rather than in here.