{"record":{"id":"fcd8bf516c4b38b4","repo":"golang/go","slug":"error-processing-pprof-pgo-profile-w","errorCode":null,"errorMessage":"error processing pprof PGO profile: %w","messagePattern":"error processing pprof PGO profile: %w","errorType":"error_code","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/cmd/compile/internal/pgoir/irgraph.go","lineNumber":144,"sourceCode":"\t}\n\tdefer f.Close()\n\tr := bufio.NewReader(f)\n\n\tisSerialized, err := pgo.IsSerialized(r)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"error processing profile header: %w\", err)\n\t}\n\n\tvar base *pgo.Profile\n\tif isSerialized {\n\t\tbase, err = pgo.FromSerialized(r)\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"error processing serialized PGO profile: %w\", err)\n\t\t}\n\t} else {\n\t\tbase, err = pgo.FromPProf(r)\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"error processing pprof PGO profile: %w\", err)\n\t\t}\n\t}\n\n\tif base.TotalWeight == 0 {\n\t\treturn nil, nil // accept but ignore profile with no samples.\n\t}\n\n\t// Create package-level call graph with weights from profile and IR.\n\twg := createIRGraph(base.NamedEdgeMap)\n\n\treturn &Profile{\n\t\tProfile:    base,\n\t\tWeightedCG: wg,\n\t}, nil\n}\n\n// createIRGraph builds the IRGraph by visiting all the ir.Func in decl list\n// of a package.","sourceCodeStart":126,"sourceCodeEnd":162,"githubUrl":"https://github.com/golang/go/blob/b6b368adc57c96c3151d224d172029f233ead2c3/src/cmd/compile/internal/pgoir/irgraph.go#L126-L162","documentation":"When the PGO profile is in pprof format, the compiler calls pgo.FromPProf to parse the protobuf-encoded profile data. This error wraps any parsing failure, indicating the pprof data is malformed, contains invalid protobuf, or has structural inconsistencies.","triggerScenarios":"Passing a file that has a pprof magic number but contains corrupted or invalid protobuf data. Profiles from incompatible pprof implementations. Profiles that were truncated during generation.","commonSituations":"Profiles generated by interrupted profiling sessions (timeout, OOM kill, signal). Profiles from non-standard profiling tools that produce partial pprof output. Manual editing of profile files.","solutions":["Regenerate the profile from scratch: go test -cpuprofile=default.pgo ./...","Validate the profile opens correctly: go tool pprof -top default.pgo","Ensure the profiling process ran to completion without being killed","Check available disk space and memory during profiling"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"// Validate a pprof profile using the pprof tool chain\nfunc validatePprofProfile(path string) error {\n    f, err := os.Open(path)\n    if err != nil {\n        return err\n    }\n    defer f.Close()\n    // pprof files are gzip-compressed protobuf; check for gzip header\n    header := make([]byte, 2)\n    if _, err := io.ReadFull(f, header); err != nil {\n        return fmt.Errorf(\"cannot read profile header: %w\", err)\n    }\n    if header[0] != 0x1f || header[1] != 0x8b {\n        return fmt.Errorf(\"not a gzip-compressed pprof profile\")\n    }\n    return nil\n}","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Regenerate CPU profiles from scratch if parsing fails — do not attempt to repair them","Ensure profiling sessions complete without interruption (no timeouts, OOM kills)","Validate profiles with 'go tool pprof -top profile.pgo' before using for PGO builds","Store profiles from completed profiling runs only — discard interrupted profiles"],"tags":["go-compiler","go-pgo","pprof","data-parsing","protobuf"],"analyzedSha":"b6b368adc57c96c3151d224d172029f233ead2c3","analyzedAt":"2026-08-12T00:22:02.250Z","schemaVersion":2},"datasetVersion":"2026-08-12T06:17:24.410Z"}