rancher: App upgrade failure: panic at go/src/k8s.io/helm/pkg/tiller/release_update.go:166

What kind of request is this (question/bug/enhancement/feature request): panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x50 pc=0x12e8cc8]

goroutine 15 [running]: k8s.io/helm/pkg/tiller.(*ReleaseServer).performUpdateForce(0xc420819860, 0xc42052a8c0, 0x0, 0x0, 0x17b7b40) /go/src/k8s.io/helm/pkg/tiller/release_update.go:166 +0x188 k8s.io/helm/pkg/tiller.(*ReleaseServer).UpdateRelease(0xc420819860, 0x17d8960, 0xc420932210, 0xc42052a8c0, 0xc420819860, 0x16b98a6, 0xd) /go/src/k8s.io/helm/pkg/tiller/release_update.go:43 +0x245 k8s.io/helm/pkg/proto/hapi/services._ReleaseService_UpdateRelease_Handler.func1(0x17d8960, 0xc420932210, 0x16066c0, 0xc42052a8c0, 0x32, 0xc42052aa50, 0x1, 0x1681d11) /go/src/k8s.io/helm/pkg/proto/hapi/services/tiller.pb.go:1244 +0x86 k8s.io/helm/vendor/github.com/grpc-ecosystem/go-grpc-prometheus.(*ServerMetrics).UnaryServerInterceptor.func1(0x17d8960, 0xc420932210, 0x16066c0, 0xc42052a8c0, 0xc42094e6e0, 0xc42094e700, 0x48, 0xc42094e5c0, 0xc420a37a40, 0x4108c8) /go/src/k8s.io/helm/vendor/github.com/grpc-ecosystem/go-grpc-prometheus/server_metrics.go:86 +0xdb k8s.io/helm/pkg/tiller.newUnaryInterceptor.func1(0x17d8960, 0xc420932210, 0x16066c0, 0xc42052a8c0, 0xc42094e6e0, 0xc42094e700, 0xc420655ab0, 0x4108c8, 0x50, 0x15d88a0) /go/src/k8s.io/helm/pkg/tiller/server.go:60 +0xab k8s.io/helm/pkg/proto/hapi/services._ReleaseService_UpdateRelease_Handler(0x1640500, 0xc420819860, 0x17d8960, 0xc420932210, 0xc42052a870, 0x1715568, 0x0, 0x0, 0xc4207a2800, 0x0) /go/src/k8s.io/helm/pkg/proto/hapi/services/tiller.pb.go:1246 +0x167 k8s.io/helm/vendor/google.golang.org/grpc.(*Server).processUnaryRPC(0xc4200d1540, 0x17e14a0, 0xc42031f1e0, 0xc4204b4100, 0xc4208198f0, 0x2162cf0, 0x0, 0x0, 0x0) /go/src/k8s.io/helm/vendor/google.golang.org/grpc/server.go:826 +0x9c8 k8s.io/helm/vendor/google.golang.org/grpc.(*Server).handleStream(0xc4200d1540, 0x17e14a0, 0xc42031f1e0, 0xc4204b4100, 0x0) /go/src/k8s.io/helm/vendor/google.golang.org/grpc/server.go:1023 +0x1318 k8s.io/helm/vendor/google.golang.org/grpc.(*Server).serveStreams.func1.1(0xc42080efc0, 0xc4200d1540, 0x17e14a0, 0xc42031f1e0, 0xc4204b4100) /go/src/k8s.io/helm/vendor/google.golang.org/grpc/server.go:572 +0x9f created by k8s.io/helm/vendor/google.golang.org/grpc.(*Server).serveStreams.func1 /go/src/k8s.io/helm/vendor/google.golang.org/grpc/server.go:570 +0xa1 2019/06/23 01:41:27 [ERROR] AppController p-pqlm4/cluster-alerting [helm-controller] failed with : failed to install app cluster-alerting. Error: UPGRADE FAILED: transport is closing

Steps to reproduce (least amount of steps as possible):

Result:

Other details that may be helpful:

Environment information

• Rancher version (rancher/rancher/rancher/server image tag or shown bottom left in the UI):
• Installation option (single install/HA):

Cluster information

• Cluster type (Hosted/Infrastructure Provider/Custom/Imported):
• Machine type (cloud/VM/metal) and specifications (CPU/memory):
• Kubernetes version (use kubectl version):

(paste the output here)

• Docker version (use docker version): 18.09.6-3.el7.x86_64

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