When caches fail to sync we shouldn't panic but only exit 1.
Confirmed with latest payload: 4.6.0-0.nightly-2020-09-12-230035, the issue has fixed:
1) Turn off kube-apiserver on node1;
2) Delete the kube-controller-manager-cert-syncer container of the same node;
3) Wait for 10 mins, check the kube-controller-manager-cert-syncer container again .
Could see the container only exit with code 1 . no panic:
F0914 13:05:32.055616 1 base_controller.go:95] unable to sync caches for CertSyncController
Exit Code: 1
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (OpenShift Container Platform 4.6 GA Images), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.