{"record":{"id":"1c72d04c89798587","repo":"golang/go","slug":"open-s-v","errorCode":null,"errorMessage":"open %s: %v","messagePattern":"open (.+?): (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/cmd/internal/objfile/objfile.go","lineNumber":79,"sourceCode":"var openers = []func(io.ReaderAt) (rawFile, error){\n\topenElf,\n\topenMacho,\n\topenPE,\n\topenPlan9,\n\topenXcoff,\n}\n\n// Open opens the named file.\n// The caller must call f.Close when the file is no longer needed.\nfunc Open(name string) (*File, error) {\n\tr, err := os.Open(name)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\tif f, err := openGoFile(r); err == nil {\n\t\treturn f, nil\n\t} else if _, ok := err.(archive.ErrGoObjOtherVersion); ok {\n\t\treturn nil, fmt.Errorf(\"open %s: %v\", name, err)\n\t}\n\tfor _, try := range openers {\n\t\tif raw, err := try(r); err == nil {\n\t\t\treturn &File{r, []*Entry{{raw: raw}}}, nil\n\t\t}\n\t}\n\tr.Close()\n\treturn nil, fmt.Errorf(\"open %s: unrecognized object file\", name)\n}\n\nfunc (f *File) Close() error {\n\treturn f.r.Close()\n}\n\nfunc (f *File) Entries() []*Entry {\n\treturn f.entries\n}\n","sourceCodeStart":61,"sourceCodeEnd":97,"githubUrl":"https://github.com/golang/go/blob/b6b368adc57c96c3151d224d172029f233ead2c3/src/cmd/internal/objfile/objfile.go#L61-L97","documentation":"When `objfile.Open` is called, it first tries to parse the file as a Go object file or archive. If that fails with `archive.ErrGoObjOtherVersion`, this error is returned. That specific error type indicates the archive was produced by a different Go toolchain version whose object format is incompatible with the current one.","triggerScenarios":"Calling `objfile.Open` on a Go archive or object file that was compiled with a different major/minor Go version. The Go object file format (`goobj`) is versioned and changes between Go releases, so object files from one version generally cannot be consumed by another.","commonSituations":"Stale build caches or archives left over from a Go version upgrade. Mixing object files compiled with different Go versions (e.g., Go 1.21 and Go 1.22). Linking object files produced by a different Go installation. Using a CI pipeline that caches `.a` files across Go version upgrades.","solutions":["Clean the build cache and rebuild from source: `go clean -cache && go build`.","Ensure all object files were compiled with the same Go toolchain version: `go version` on all build machines.","Remove stale `.a` files in vendor or local directories.","Pin the Go version consistently across all environments (CI, local, deploy)."],"exampleFix":"// before — stale archives from old Go version\n$ go build ./...  // fails if .a files are from older Go\n\n// after — clean cache and rebuild\n$ go clean -cache\n$ go build ./...","handlingStrategy":"validation","validationCode":"// Check Go version consistency before opening archives\nfunc checkGoObjVersion(path string) error {\n    f, err := objfile.Open(path)\n    if err != nil {\n        if strings.Contains(err.Error(), \"ErrGoObjOtherVersion\") {\n            return fmt.Errorf(\"stale archive from different Go version — run 'go clean -cache' and rebuild\")\n        }\n        return err\n    }\n    f.Close()\n    return nil\n}","typeGuard":null,"tryCatchPattern":"f, err := objfile.Open(path)\nif err != nil && strings.Contains(err.Error(), path) {\n    // Could be version mismatch — suggest cache clean\n    log.Printf(\"Failed to open %s. Try 'go clean -cache' if Go was recently upgraded.\", path)\n}","preventionTips":["Run 'go clean -cache' after upgrading Go versions.","Pin Go version consistently across CI, local, and deploy environments.","Remove stale .a files in vendor and build directories after version changes."],"tags":["goobj","version-mismatch","archive","build-cache","objfile"],"analyzedSha":"b6b368adc57c96c3151d224d172029f233ead2c3","analyzedAt":"2026-08-12T00:22:02.250Z","schemaVersion":2},"datasetVersion":"2026-08-12T06:17:24.410Z"}