OpenShift master-controllers crash with "fatal error: concurrent map writes"

Issue

• After upgrading from OpenShift 3.5 to 3.6, the OpenShift Master Controllers panic and crash repeatedly with the following error during StatefulSets processing:

atomic-openshift-master-controllers[29121]: fatal error: concurrent map writes
atomic-openshift-master-controllers[29121]: goroutine 29472 [running]:
atomic-openshift-master-controllers[29121]: runtime.throw(0x511810e, 0x15)
atomic-openshift-master-controllers[29121]: /usr/lib/golang/src/runtime/panic.go:566 +0x95 fp=0xc424387048 sp=0xc424387028
atomic-openshift-master-controllers[29121]: runtime.mapassign1(0x4850280, 0xc42205a1b0, 0xc424387228, 0xc424387218)
atomic-openshift-master-controllers[29121]: /usr/lib/golang/src/runtime/hashmap.go:458 +0x8ef fp=0xc424387130 sp=0xc424387048
atomic-openshift-master-controllers[29121]: github.com/openshift/origin/vendor/k8s.io/kubernetes/pkg/api/v1.Convert_v1_Pod_To_api_Pod(0xc4235b9e40, 0xc4211c4600, 0x0, 0x0, 0x6400000, 0x0)
atomic-openshift-master-controllers[29121]: /builddir/build/BUILD/atomic-openshift-git-0.0b9377a/_output/local/go/src/github.com/openshift/origin/vendor/k8s.io/kubernetes/pkg/api/v1/conversion.go:617 +0x679 fp=0xc4243872c8 sp=0xc424387130