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HPA panics #39680

@gmarek

Description

@gmarek

I just run into panic in controller-manager:

/usr/local/go/src/runtime/asm_amd64.s:2086
panic: runtime error: integer divide by zero [recovered]
        panic: runtime error: integer divide by zero [recovered]
        panic: runtime error: integer divide by zero

goroutine 327 [running]:
panic(0x229cb80, 0xc420010040)
        /usr/local/go/src/runtime/panic.go:500 +0x1a1
k8s.io/kubernetes/pkg/util/runtime.HandleCrash(0x0, 0x0, 0x0)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/util/runtime/runtime.go:56 +0x126
panic(0x229cb80, 0xc420010040)
        /usr/local/go/src/runtime/panic.go:458 +0x243
k8s.io/kubernetes/pkg/util/runtime.HandleCrash(0x0, 0x0, 0x0)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/util/runtime/runtime.go:56 +0x126
panic(0x229cb80, 0xc420010040)
        /usr/local/go/src/runtime/panic.go:458 +0x243
k8s.io/kubernetes/pkg/controller/podautoscaler/metrics.GetResourceUtilizationRatio(0xc4218cb1a0, 0xc421064ce0, 0xc40000003c, 0x26, 0xc4217c7408, 0x38cc801, 0xc421995740)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/controller/podautoscaler/metrics/utilization.go:37 +0x196
k8s.io/kubernetes/pkg/controller/podautoscaler.(*ReplicaCalculator).GetResourceReplicas(0xc420907f60, 0x3c00000002, 0x26fdc1a, 0x3, 0xc42090ae54, 0x7, 0x38cc8e0, 0xc421995740, 0xc4212da480, 0x26ffbca, ...)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/controller/podautoscaler/replica_calculator.go:97 +0x958
k8s.io/kubernetes/pkg/controller/podautoscaler.(*HorizontalController).computeReplicasForCPUUtilization(0xc4208fbc70, 0xc4203d2f08, 0xc4212da480, 0x37, 0x39460e0, 0xc4212da400, 0x0, 0x0, 0x0, 0x0)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/controller/podautoscaler/horizontal.go:167 +0x3e1
k8s.io/kubernetes/pkg/controller/podautoscaler.(*HorizontalController).reconcileAutoscaler(0xc4208fbc70, 0xc4203d2f08, 0x27855ae, 0x37)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/controller/podautoscaler/horizontal.go:315 +0xc42
k8s.io/kubernetes/pkg/controller/podautoscaler.newInformer.func3(0x26b07a0, 0xc4203d2f08)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/controller/podautoscaler/horizontal.go:95 +0xc3
k8s.io/kubernetes/pkg/client/cache.ResourceEventHandlerFuncs.OnAdd(0xc4208d2200, 0xc4208d2210, 0x0, 0x26b07a0, 0xc4203d2f08)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/client/cache/controller.go:173 +0x49
k8s.io/kubernetes/pkg/client/cache.(*ResourceEventHandlerFuncs).OnAdd(0xc4208fe0c0, 0x26b07a0, 0xc4203d2f08)
        <autogenerated>:50 +0x78
k8s.io/kubernetes/pkg/client/cache.NewInformer.func1(0x22f5240, 0xc4219952e0, 0xc4219952e0, 0x22f5240)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/client/cache/controller.go:251 +0x270
k8s.io/kubernetes/pkg/client/cache.(*DeltaFIFO).Pop(0xc420864630, 0xc42087bd10, 0x0, 0x0, 0x0, 0x0)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/client/cache/delta_fifo.go:420 +0x22a
k8s.io/kubernetes/pkg/client/cache.(*Controller).processLoop(0xc42018ae00)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/client/cache/controller.go:131 +0x3c
k8s.io/kubernetes/pkg/client/cache.(*Controller).(k8s.io/kubernetes/pkg/client/cache.processLoop)-fm()
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/client/cache/controller.go:102 +0x2a
k8s.io/kubernetes/pkg/util/wait.JitterUntil.func1(0xc421065f60)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/util/wait/wait.go:96 +0x5e
k8s.io/kubernetes/pkg/util/wait.JitterUntil(0xc421065f60, 0x3b9aca00, 0x0, 0x2164401, 0xc420126a20)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/util/wait/wait.go:97 +0xad
k8s.io/kubernetes/pkg/util/wait.Until(0xc421065f60, 0x3b9aca00, 0xc420126a20)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/util/wait/wait.go:52 +0x4d
k8s.io/kubernetes/pkg/client/cache.(*Controller).Run(0xc42018ae00, 0xc420126a20)
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/client/cache/controller.go:102 +0x1af
created by k8s.io/kubernetes/pkg/controller/podautoscaler.(*HorizontalController).Run
        /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/controller/podautoscaler/horizontal.go:133 +0xc0

This clearly shouldn't happen.

cc @fgrzadkowski @jszczepkowski @kubernetes/sig-autoscaling-misc

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