{"record":{"id":"78c5458a6db3948e","repo":"XTLS/Xray-core","slug":"padding-turn-0-is-too-short-for-d-prefix-bytes","errorCode":null,"errorMessage":"padding turn 0 is too short for %d prefix bytes","messagePattern":"padding turn 0 is too short for (.+?) prefix bytes","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"transport/internet/finalmask/xmc/padding.go","lineNumber":115,"sourceCode":"\t\tif len(turn.variants) > 0 && turn.writeChunkLength != 0 {\n\t\t\treturn fmt.Errorf(\"padding turn %d combines variants with generated write chunks\", i)\n\t\t}\n\n\t\tminLength, maxLength, err := paddingTurnBounds(turn)\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"padding turn %d: %w\", i, err)\n\t\t}\n\t\thasSendRange := turn.sendMinLength != 0 || turn.sendMaxLength != 0\n\t\tif hasSendRange {\n\t\t\tif len(turn.variants) > 0 {\n\t\t\t\treturn fmt.Errorf(\"padding turn %d combines variants with a send range\", i)\n\t\t\t}\n\t\t\tif turn.sendMinLength < minLength || turn.sendMaxLength < turn.sendMinLength || turn.sendMaxLength > maxLength {\n\t\t\t\treturn fmt.Errorf(\"padding turn %d has an invalid send range: %d-%d\", i, turn.sendMinLength, turn.sendMaxLength)\n\t\t\t}\n\t\t}\n\t\tif i == 0 && minLength-firstTurnPrefixLength < 1 {\n\t\t\treturn fmt.Errorf(\"padding turn 0 is too short for %d prefix bytes\", firstTurnPrefixLength)\n\t\t}\n\t\tif i == 0 && len(turn.variants) > 0 {\n\t\t\tfor j, variant := range turn.variants {\n\t\t\t\tif _, _, err = trimPaddingPrefix(variant, firstTurnPrefixLength); err != nil {\n\t\t\t\t\treturn fmt.Errorf(\"padding turn 0 variant %d: %w\", j, err)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tif i > 0 && turn.direction == schedule[i-1].direction {\n\t\t\treturn fmt.Errorf(\"padding turns %d and %d have the same direction\", i-1, i)\n\t\t}\n\t}\n\treturn nil\n}\n\nfunc writePaddingTurn(w io.Writer, turn paddingTurn, prefixLength int) error {\n\treturn writePaddingTurnWithSleep(w, turn, prefixLength, time.Sleep)\n}","sourceCodeStart":97,"sourceCodeEnd":133,"githubUrl":"https://github.com/XTLS/Xray-core/blob/7d214f8b094f75322fa3990f8aadad1c912f24f5/transport/internet/finalmask/xmc/padding.go#L97-L133","documentation":"Error \"padding turn 0 is too short for %d prefix bytes\" thrown in XTLS/Xray-core.","triggerScenarios":"Thrown at transport/internet/finalmask/xmc/padding.go:115 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"7d214f8b094f75322fa3990f8aadad1c912f24f5","analyzedAt":"2026-08-15T14:26:24.325Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}