Exact root cause is still uncertain, but when apiserver is having problems, the csi sidecars will fail to get the leader election lease with this error:
"error retrieving resource lock kube-system/external-attacher-leader-my-driver: Get https://localhost:443/apis/coordination.k8s.io/v1/namespaces/kube-system/leases/external-attacher-leader-my-driver: write tcp [::1]:53540->[::1]:443: write: broken pipe"
Even after apiserver comes back up, this error continues and never recovers. This is apparently intended behavior, and the fix is to enable watchdog so that kubelet can restart the container: https://github.com/kubernetes/client-go/blob/master/tools/leaderelection/healthzadaptor.go#L25
In-tree controllers like kube-controller-manager already set this.
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