panic: reflect: call of reflect.Value.Set on zero Value #31750
Description
What happened?
With helm v4.0.5 the example below works just fine. With helm v4.1.0 it ends in a panic.
$ helm template test ./test
panic: reflect: call of reflect.Value.Set on zero Value
goroutine 1 [running]:
reflect.flag.mustBeExportedSlow(0x10?)
reflect/value.go:232 +0xb8
reflect.flag.mustBeExported(...)
reflect/value.go:226
reflect.Value.Set({0x10468f4c0?, 0x1400022a7c0?, 0x194?}, {0x0?, 0x0?, 0x1400088b360?})
reflect/value.go:2126 +0x88
helm.sh/helm/v4/internal/copystructure.copyValue({0x104548f60, 0x1400024d5c0, 0x97})
helm.sh/helm/v4/internal/copystructure/copystructure.go:96 +0x624
helm.sh/helm/v4/internal/copystructure.copyValue({0x10468f4c0, 0x1400022a7b0, 0x94})
helm.sh/helm/v4/internal/copystructure/copystructure.go:46 +0x5c
helm.sh/helm/v4/internal/copystructure.copyValue({0x10475ac40, 0x14000715e30, 0x15})
helm.sh/helm/v4/internal/copystructure/copystructure.go:66 +0x7a8
helm.sh/helm/v4/internal/copystructure.copyValue({0x10468f4c0, 0x1400022a790, 0x94})
helm.sh/helm/v4/internal/copystructure/copystructure.go:46 +0x5c
helm.sh/helm/v4/internal/copystructure.copyValue({0x10475ac40, 0x140003f2a50, 0x15})
helm.sh/helm/v4/internal/copystructure/copystructure.go:66 +0x7a8
helm.sh/helm/v4/internal/copystructure.Copy({0x10475ac40?, 0x140003f2a50?})
helm.sh/helm/v4/internal/copystructure/copystructure.go:30 +0x64
helm.sh/helm/v4/pkg/chart/common/util.coalesceValues(0x104aacb08, {0x10499d960, 0x140001c6680}, 0x140002cb530, {0x0, 0x0}, 0x0)
helm.sh/helm/v4/pkg/chart/common/util/coalesce.go:212 +0xf8
helm.sh/helm/v4/pkg/chart/common/util.coalesce(0x104aacb08, {0x10499d960, 0x140001c6680}, 0x140002cb530, {0x0, 0x0}, 0x0)
helm.sh/helm/v4/pkg/chart/common/util/coalesce.go:100 +0x38
helm.sh/helm/v4/pkg/chart/common/util.CoalesceValues({0x10499d960, 0x140001c6680}, 0x14000b05b60)
helm.sh/helm/v4/pkg/chart/common/util/coalesce.go:50 +0x64
helm.sh/helm/v4/pkg/chart/common/util.ToRenderValuesWithSchemaValidation({0x10499d960, 0x140001c6680}, 0x14000b05b60, {{0x16d784f96, 0x4}, {0x140000f66d0, 0x7}, 0x1, 0x0, 0x1}, ...)
helm.sh/helm/v4/pkg/chart/common/util/values.go:57 +0x3b0
helm.sh/helm/v4/pkg/action.(*Install).RunWithContext(0x14000182c40, {0x104ad43c8, 0x140005ffc70}, {0x10499d960?, 0x140001c6680?}, 0x14000b05b60)
helm.sh/helm/v4/pkg/action/install.go:346 +0xcd4
helm.sh/helm/v4/pkg/cmd.runInstall({0x140001a9860, 0x2, 0x2}, 0x14000182c40, 0x140003ecf30, {0x104ab8f48, 0x140001a6028})
helm.sh/helm/v4/pkg/cmd/install.go:326 +0x668
helm.sh/helm/v4/pkg/cmd.newTemplateCmd.func2(0x14000971b08, {0x140001a9860, 0x2, 0x2})
helm.sh/helm/v4/pkg/cmd/template.go:108 +0x1fc
github.com/spf13/cobra.(*Command).execute(0x14000971b08, {0x140001a9820, 0x2, 0x2})
github.com/spf13/cobra@v1.10.2/command.go:1015 +0x7d4
github.com/spf13/cobra.(*Command).ExecuteC(0x140003f4308)
github.com/spf13/cobra@v1.10.2/command.go:1148 +0x350
github.com/spf13/cobra.(*Command).Execute(0x104ab8f48?)
github.com/spf13/cobra@v1.10.2/command.go:1071 +0x1c
main.main()
helm.sh/helm/v4/cmd/helm/helm.go:43 +0x140
What did you expect to happen?
Helm completes successfully
How can we reproduce it (as minimally and precisely as possible)?
mkdir -p test
cat > test/Chart.yaml <<EOC
apiVersion: v2
name: test
version: 0.1.0
EOC
cat > test/values.yaml <<EOC
server:
extraArgs:
-
EOC
helm template test ./testHelm version
Details
$ helm version
version.BuildInfo{Version:"v4.1.0", GitCommit:"4553a0a96e5205595079b6757236cc6f969ed1b9", GitTreeState:"clean", GoVersion:"go1.25.6", KubeClientVersion:"v1.35"}Kubernetes version
Does not apply