v3.9.0 regression - panic in getNamespacesForRoleBinding

[alexec]

Our builds have just started running with kustomize v3.9.0 and are panicking. This can only be a regression.

https://github.com/argoproj/argo/pull/4618/checks?check_run_id=1533236396

panic: interface conversion: interface {} is string, not map[string]interface {}

goroutine 1 [running]:
sigs.k8s.io/kustomize/api/resmap.getNamespacesForRoleBinding(0xc0009774a0, 0x19)
	/go/pkg/mod/sigs.k8s.io/kustomize/api@v0.7.0/resmap/reswrangler.go:417 +0x33f
sigs.k8s.io/kustomize/api/resmap.(*resWrangler).SubsetThatCouldBeReferencedByResource(0xc00044bd60, 0xc0009774a0, 0xb, 0xc0028a9501)
	/go/pkg/mod/sigs.k8s.io/kustomize/api@v0.7.0/resmap/reswrangler.go:384 +0xca
sigs.k8s.io/kustomize/api/internal/accumulator.(*nameReferenceTransformer).Transform(0xc00243edc0, 0x1990300, 0xc00044bd60, 0xc00044bd60, 0x0)
	/go/pkg/mod/sigs.k8s.io/kustomize/api@v0.7.0/internal/accumulator/namereferencetransformer.go:85 +0x515
sigs.k8s.io/kustomize/api/internal/accumulator.(*ResAccumulator).Transform(...)
	/go/pkg/mod/sigs.k8s.io/kustomize/api@v0.7.0/internal/accumulator/resaccumulator.go:138
sigs.k8s.io/kustomize/api/internal/accumulator.(*ResAccumulator).FixBackReferences(0xc00044bd40, 0xc00044bd40, 0x0)
	/go/pkg/mod/sigs.k8s.io/kustomize/api@v0.7.0/internal/accumulator/resaccumulator.go:164 +0xba
sigs.k8s.io/kustomize/api/internal/target.(*KustTarget).makeCustomizedResMap(0xc000206a80, 0x0, 0x0, 0x1986bc0, 0x25be0e8)
	/go/pkg/mod/sigs.k8s.io/kustomize/api@v0.7.0/internal/target/kusttarget.go:125 +0x7b
sigs.k8s.io/kustomize/api/internal/target.(*KustTarget).MakeCustomizedResMap(...)
	/go/pkg/mod/sigs.k8s.io/kustomize/api@v0.7.0/internal/target/kusttarget.go:106
sigs.k8s.io/kustomize/api/krusty.(*Kustomizer).Run(0xc000e77d20, 0x7ffd0447e18f, 0x19, 0x0, 0x0, 0x0, 0x0)
	/go/pkg/mod/sigs.k8s.io/kustomize/api@v0.7.0/krusty/kustomizer.go:77 +0x294
sigs.k8s.io/kustomize/kustomize/v3/internal/commands/build.(*Options).RunBuild(0xc00015bb90, 0x192dde0, 0xc00000e018, 0x2, 0x0)
	/workspace/myClone/kustomize/internal/commands/build/build.go:148 +0xb5
sigs.k8s.io/kustomize/kustomize/v3/internal/commands/build.NewCmdBuild.func1(0xc000218580, 0xc00044aba0, 0x1, 0x2, 0x0, 0x0)
	/workspace/myClone/kustomize/internal/commands/build/build.go:70 +0xab
github.com/spf13/cobra.(*Command).execute(0xc000218580, 0xc00044ab80, 0x2, 0x2, 0xc000218580, 0xc00044ab80)
	/go/pkg/mod/github.com/spf13/cobra@v1.0.0/command.go:842 +0x453
github.com/spf13/cobra.(*Command).ExecuteC(0xc0000bd8c0, 0x0, 0x14d5840, 0xc00007e058)
	/go/pkg/mod/github.com/spf13/cobra@v1.0.0/command.go:950 +0x349
github.com/spf13/cobra.(*Command).Execute(...)
	/go/pkg/mod/github.com/spf13/cobra@v1.0.0/command.go:887
main.main()
	/workspace/myClone/kustomize/main.go:19 +0x27
make: *** [manifests/install.yaml] Error 2

Files that can reproduce the issue

Expected output

Actual output

Kustomize version

Platform

Additional context

[Shell32-Natsu]

This is caused by this

kustomize/api/internal/wrappy/wnode.go

Lines 92 to 98 in 4011187

	if yn.Kind == yaml.SequenceNode {
	var result []interface{}
	for _, node := range yn.Content {
	result = append(result, node.Value)
	}
	return result, nil
	}

You can use 3.8.8 before we fix this.

[alexec]

good work chap