{"record":{"id":"5274023b0342d9b8","repo":"XTLS/Xray-core","slug":"target-length-d-leaves-an-invalid-record-length","errorCode":null,"errorMessage":"target length %d leaves an invalid record length %d","messagePattern":"target length (.+?) leaves an invalid record length (.+?)","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"transport/internet/finalmask/xmc/padding.go","lineNumber":154,"sourceCode":"\treturn writePaddingTurnWithBuffer(w, turn, prefixLength, sleep, nil)\n}\n\nfunc writePaddingTurnWithBuffer(w io.Writer, turn paddingTurn, prefixLength int, sleep func(time.Duration), reusableBuffer *[]byte) error {\n\tstartDelay, err := randomPaddingDelay(turn.startDelay)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"select padding start delay: %w\", err)\n\t}\n\tif startDelay > 0 {\n\t\tsleep(startDelay)\n\t}\n\n\ttargetLength, chunks, delays, err := selectPaddingVariant(turn, prefixLength)\n\tif err != nil {\n\t\treturn err\n\t}\n\trecordLength := targetLength - prefixLength\n\tif recordLength < 1 {\n\t\treturn fmt.Errorf(\"target length %d leaves an invalid record length %d\", targetLength, recordLength)\n\t}\n\n\tencodedLength := Varint(recordLength)\n\tvar header bytes.Buffer\n\tif err = encodedLength.writeTo(&header); err != nil {\n\t\treturn fmt.Errorf(\"write padding header: %w\", err)\n\t}\n\tif len(chunks) == 0 {\n\t\twriteChunkLength := turn.writeChunkLength\n\t\tif writeChunkLength == 0 {\n\t\t\twriteChunkLength = paddingBufferLength\n\t\t} else if turn.writeChunkMinLength > 0 {\n\t\t\twriteChunkLength, err = randomPaddingTarget(turn.writeChunkMinLength, writeChunkLength)\n\t\t\tif err != nil {\n\t\t\t\treturn fmt.Errorf(\"select padding write chunk length: %w\", err)\n\t\t\t}\n\t\t}\n\t\tchunks = defaultPaddingChunks(recordLength, writeChunkLength)","sourceCodeStart":136,"sourceCodeEnd":172,"githubUrl":"https://github.com/XTLS/Xray-core/blob/7d214f8b094f75322fa3990f8aadad1c912f24f5/transport/internet/finalmask/xmc/padding.go#L136-L172","documentation":"Error \"target length %d leaves an invalid record length %d\" thrown in XTLS/Xray-core.","triggerScenarios":"Thrown at transport/internet/finalmask/xmc/padding.go:154 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":"2026-08-15T22:17:37.221Z"}