{"record":{"id":"5a80e1da39fc83d5","repo":"kubernetes/kops","slug":"creating-accessor-for-v-w","errorCode":null,"errorMessage":"creating accessor for %v: %w","messagePattern":"creating accessor for (.+?): %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/dump/resourcedumper.go","lineNumber":234,"sourceCode":"\t\t\t\terr: fmt.Errorf(\"creating file %q: %w\", resPath, err),\n\t\t\t}\n\t\t\tcontinue\n\t\t}\n\n\t\terr = resourceList.EachListItem(func(obj runtime.Object) error {\n\t\t\to, err := meta.Accessor(obj)\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\to.SetManagedFields(nil)\n\t\t\tif err := maskObject(obj); err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\treturn nil\n\t\t})\n\t\tif err != nil {\n\t\t\tresults <- resourceDumpResult{\n\t\t\t\terr: fmt.Errorf(\"creating accessor for %v: %w\", job, err),\n\t\t\t}\n\t\t\tcontinue\n\t\t}\n\t\tcontents, err := resourceList.MarshalJSON()\n\t\tif err != nil {\n\t\t\tresults <- resourceDumpResult{\n\t\t\t\terr: fmt.Errorf(\"marshaling to json for %v: %w\", job, err),\n\t\t\t}\n\t\t\tcontinue\n\t\t}\n\n\t\tswitch d.output {\n\t\tcase \"yaml\":\n\t\t\tcontents, err = yaml.JSONToYAML(contents)\n\t\t\tif err != nil {\n\t\t\t\tresults <- resourceDumpResult{\n\t\t\t\t\terr: fmt.Errorf(\"marshaling to yaml for %v: %w\", job, err),\n\t\t\t\t}","sourceCodeStart":216,"sourceCodeEnd":252,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/dump/resourcedumper.go#L216-L252","documentation":"While iterating over the listed items, dumpGVRNamespaces calls meta.Accessor(obj) on each runtime.Object to get its ObjectMeta so it can strip managedFields and mask secrets. If an object does not implement metav1.Object (no GetObjectMeta/Name/Namespace accessor), meta.Accessor returns an error, which is wrapped as \"creating accessor for %v: %w\" for the whole job's resource list.","triggerScenarios":"The dynamic client returns list items that cannot be accessed as metav1.Object — typically a nil object, a malformed/unregistered type returned by an aggregated API server or a CRD serving non-standard responses, or an unexpected item type inside UnstructuredList.","commonSituations":"A custom resource served by a nonconforming aggregated API server; a CRD webhook returning list items without proper ObjectMeta; corrupted responses from an older/damaged Kubernetes version; nil entries in a list produced by a broken controller.","solutions":["Identify the GVR/namespace named in the error (%v job) and test `kubectl get --raw /apis/<group>/<version>/<resource>?fieldSelector=metadata.namespace=<ns>` to inspect the served response.","Check the API server serving that resource (CRD or aggregated apiserver) for version skew or bugs; upgrade/fix it.","Skip the problematic resource via the dumper's ignoredResources path or upgrade kOps to pick up resilience fixes.","Re-run the dump; transient corrupted responses may disappear once the API server is healthy."],"exampleFix":"// before\no, err := meta.Accessor(obj)\n// after (guard against nil/unexpected items)\nif obj == nil || obj.GetObjectKind() == nil {\n  return nil // skip malformed item\n}\no, err := meta.Accessor(obj)","handlingStrategy":"try-catch","validationCode":null,"typeGuard":"func hasMeta(obj runtime.Object) (metav1.Object, bool) {\n  if obj == nil { return nil, false }\n  o, err := meta.Accessor(obj)\n  return o, err == nil\n}","tryCatchPattern":"// Go: errors are values — recover like a catch by unwrapping the cause\nif err := runDump(); err != nil {\n  if strings.Contains(err.Error(), \"creating accessor for\") {\n    // identify job from message, verify resource with kubectl, skip or retry\n  }\n  return err\n}","preventionTips":["Verify every served resource responds correctly via `kubectl get --raw` before dumping.","Keep the API server and aggregated apiservers healthy and version-aligned.","Upgrade kOps/k8s.io/apimachinery to get fixes for unregistered/nil object handling.","Exclude broken CRDs from dumps until their controllers serve conforming objects."],"tags":["kubernetes","meta-accessor","dynamic-client","kops"],"backgroundTag":"meta-accessor-failed","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T12:17:11.808Z"}