Results analyzer failed

[c7h]

Hi, While performing some fuzzing, I'm receiving an error after a few minutes of fuzzing:

./Restler fuzz --grammar_file Compile/grammar.py --dictionary_file Compile/dict.json --target_ip 127.0.0.1 --target_port 8010 --no_ssl --host localhost --time_budget 1
Starting task Fuzz...
Using python: 'python3' (Python 3.9.0)

ERROR: Results analyzer for logs in /home/c7h/workspace/restler/restler/Fuzz failed.

Request coverage (successful / total): 4 / 9
Bugs were found!
Bug buckets:

ExamplesChecker_500: 2
main_driver_500: 2
Task Fuzz succeeded.
Collecting logs...

The Fuzz/ResultAnalyzerStdErr.txt looks like this:

Unhandled exception. System.Exception: Unexpected response without prior request at 2/10/2022 7:00:02 PM: { version = "HTTP/1.1"
  statusCode = 200
  statusDescription = "OK"
  headers =
           map
             [("Content-Length", "136"); ("Content-Type", "application/json");
              ("Date", "Thu, 10 Feb 2022 18:00:02 GMT")]
  body =
        "{"nfType":"NRF","_link":{"item":[{"href":"http://nrf.free5gc.org:8000/nnrf-nfm/v1/nf-instances/3fa85f64-5717-4562-b3fc-2c963f66afa6"}]}}"
  str = None }
   at Microsoft.FSharp.Core.PrintfModule.PrintFormatToStringThenFail@1639.Invoke(String message) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\printf.fs:line 1639
   at Microsoft.FSharp.Collections.Internal.IEnumerator.choose@171.System-Collections-IEnumerator-MoveNext() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 179
   at Microsoft.FSharp.Collections.Internal.IEnumerator.map@75.DoMoveNext(b& curr) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 81
   at Microsoft.FSharp.Collections.Internal.IEnumerator.MapEnumerator`1.System-Collections-IEnumerator-MoveNext() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 68
   at Microsoft.FSharp.Core.CompilerServices.RuntimeHelpers.takeInner@266[T,TResult](ConcatEnumerator`2 x, Unit unitVar0) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seqcore.fs:line 268
   at Microsoft.FSharp.Collections.Internal.IEnumerator.map@75.DoMoveNext(b& curr) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 81
   at Microsoft.FSharp.Collections.Internal.IEnumerator.MapEnumerator`1.System-Collections-IEnumerator-MoveNext() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 68
   at Microsoft.FSharp.Collections.Internal.IEnumerator.map@75.DoMoveNext(b& curr) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 81
   at Microsoft.FSharp.Collections.Internal.IEnumerator.MapEnumerator`1.System-Collections-IEnumerator-MoveNext() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 68
   at Microsoft.FSharp.Core.CompilerServices.RuntimeHelpers.takeInner@266[T,TResult](ConcatEnumerator`2 x, Unit unitVar0) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seqcore.fs:line 268
   at Microsoft.FSharp.Collections.Internal.IEnumerator.next@193[T](FSharpFunc`2 f, IEnumerator`1 e, FSharpRef`1 started, Unit unitVar0) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 194
   at Microsoft.FSharp.Collections.SeqModule.oneStepTo@987[T](IEnumerable`1 source, List`1 prefix, FSharpRef`1 enumeratorR, Int32 i) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 996
   at Microsoft.FSharp.Collections.SeqModule.action@4164-1[T](IEnumerable`1 source, List`1 prefix, FSharpRef`1 enumeratorR, Int32 i, Unit unitVar0) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 1008
   at Microsoft.FSharp.Collections.SeqModule.result@1003.Invoke(Int32 i)
   at Microsoft.FSharp.Collections.Internal.IEnumerator.unfold@205.DoMoveNext(b& curr) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 208
   at Microsoft.FSharp.Collections.Internal.IEnumerator.MapEnumerator`1.System-Collections-IEnumerator-MoveNext() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 68
   at Microsoft.FSharp.Collections.SeqModule.Iterate[T](FSharpFunc`2 action, IEnumerable`1 source) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 496
   at Microsoft.FSharp.Collections.SeqModule.groupByValueType[T,TKey](FSharpFunc`2 keyf, IEnumerable`1 seq) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 1068
   at Microsoft.FSharp.Collections.SeqModule.GroupBy@1076.Invoke(Unit unitVar0) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 1076
   at Microsoft.FSharp.Collections.SeqModule.mkDelayedSeq@471.Invoke(Unit unitVar0) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 471
   at Restler.ResultsAnalyzer.Analyze.Buckets.getBuckets@98.GenerateNext(IEnumerable`1& next) in /home/c7h/workspace/restler-fuzzer/src/ResultsAnalyzer/Analyze/Buckets.fs:line 98
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.MoveNextImpl() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seqcore.fs:line 371
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.System-Collections-IEnumerator-MoveNext() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seqcore.fs:line 403
   at Microsoft.FSharp.Collections.SeqModule.ToList[T](IEnumerable`1 source)
   at Restler.ResultsAnalyzer.Analyze.Main.main(AnalyzeArgs args) in /home/c7h/workspace/restler-fuzzer/src/ResultsAnalyzer/Analyze/Main.fs:line 85
   at Restler.ResultsAnalyzer.Program.main(String[] argv) in /home/c7h/workspace/restler-fuzzer/src/ResultsAnalyzer/Program.fs:line 223

I've seen this problem at some other projects while using transfer-encoding. I'm not aware that my target server is sending chunked data.

I'm running RESTler version: 8.3.0

Thanks again for your help! Cheers, Christoph

[c7h]

I think this is a duplicate of #231 and #363

[c7h]

The problem is most likely caused by chunked encoding not handled correctly in RESTler.

[marcindulak]

Linking another similar issue https://github.com/microsoft/restler-fuzzer/issues/174