Fuzz introspector
For issues and ideas: https://github.com/ossf/fuzz-introspector/issues

Fuzzer details

Fuzzer: LogReaderWriterFuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 1071 98.5%
gold [1:9] 0 0.0%
yellow [10:29] 0 0.0%
greenyellow [30:49] 0 0.0%
lawngreen 50+ 16 1.47%
All colors 1087 100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked Calltree index Parent function Callsite Largest blocked function
330 756 [org.HdrHistogram.HistogramLogScanner].process(org.HdrHistogram.HistogramLogScanner$EventHandler) call site: 00756
285 307 [org.HdrHistogram.RecordedValuesIterator].reset(org.HdrHistogram.AbstractHistogram) call site: 00307
236 1 [LogReaderWriterFuzzer].fuzzerTestOneInput(com.code_intelligence.jazzer.api.FuzzedDataProvider) call site: 00001
123 632 [org.HdrHistogram.DoubleHistogram].isDoubleHistogramCookie(int) call site: 00632
68 238 [org.HdrHistogram.PercentileIterator].reset(org.HdrHistogram.AbstractHistogram,int) call site: 00238
18 612 [org.HdrHistogram.HistogramLogScanner].process(org.HdrHistogram.HistogramLogScanner$EventHandler) call site: 00612
6 593 [LogReaderWriterFuzzer].fuzzerTestOneInput(com.code_intelligence.jazzer.api.FuzzedDataProvider) call site: 00593
2 603 [org.HdrHistogram.HistogramLogScanner].process(org.HdrHistogram.HistogramLogScanner$EventHandler) call site: 00603
2 606 [org.HdrHistogram.HistogramLogScanner].process(org.HdrHistogram.HistogramLogScanner$EventHandler) call site: 00606
1 610 [org.HdrHistogram.HistogramLogScanner].process(org.HdrHistogram.HistogramLogScanner$EventHandler) call site: 00610

Runtime coverage analysis

Covered functions
17
Functions that are reachable but not covered
90
Reachable functions
97
Percentage of reachable functions covered
7.22%
NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.
Function name source code lines source lines hit percentage hit

Files reached

filename functions hit
LogReaderWriterFuzzer 1
org.HdrHistogram.Histogram 14
org.HdrHistogram.AbstractHistogram 41
org.HdrHistogram.AbstractHistogramBase 4
org.HdrHistogram.EncodableHistogram 2
org.HdrHistogram.ShortCountsHistogram 11
org.HdrHistogram.AtomicHistogram 10
org.HdrHistogram.IntCountsHistogram 11
org.HdrHistogram.ConcurrentHistogram 16
org.HdrHistogram.WriterReaderPhaser 7
org.HdrHistogram.PackedConcurrentHistogram$ConcurrentPackedArrayWithNormalizingOffset 8
org.HdrHistogram.packedarray.PackedLongArray 12
org.HdrHistogram.packedarray.AbstractPackedLongArray 9
org.HdrHistogram.packedarray.AbstractPackedArrayContext 42
org.HdrHistogram.ConcurrentHistogram$AtomicLongArrayWithNormalizingOffset 5
org.HdrHistogram.packedarray.ConcurrentPackedLongArray 6
org.HdrHistogram.packedarray.ConcurrentPackedArrayContext 14
org.HdrHistogram.packedarray.PackedArrayContext 14
org.HdrHistogram.packedarray.ResizeException 2
org.HdrHistogram.packedarray.AbstractPackedArrayContext$RetryException 2
org.HdrHistogram.packedarray.PackedLongArray:org.HdrHistogram.packedarray.ResizeException 1
org.HdrHistogram.packedarray.AbstractPackedLongArray$AllValuesIterator 3
org.HdrHistogram.DoubleAllValuesIterator 3
org.HdrHistogram.AllValuesIterator 4
org.HdrHistogram.PackedConcurrentHistogram 4
org.HdrHistogram.SynchronizedHistogram 13
org.HdrHistogram.Histogram:org.HdrHistogram.IntCountsHistogram:org.HdrHistogram.ShortCountsHistogram 1
org.HdrHistogram.DoubleLinearIterator 3
org.HdrHistogram.LinearIterator 5
org.HdrHistogram.AbstractHistogramIterator 7
org.HdrHistogram.PercentileIterator 6
org.HdrHistogram.DoubleLogarithmicIterator 3
org.HdrHistogram.LogarithmicIterator 6
org.HdrHistogram.packedarray.AbstractPackedArrayContext$NonZeroValuesIterator 4
org.HdrHistogram.DoubleRecordedValuesIterator 3
org.HdrHistogram.RecordedValuesIterator 5
org.HdrHistogram.DoublePercentileIterator 3
org.HdrHistogram.AbstractHistogram$Percentiles 1
org.HdrHistogram.HistogramIterationValue 3
org.HdrHistogram.AbstractHistogram$AllValues 1
org.HdrHistogram.DoubleHistogram$LogarithmicBucketValues 1
org.HdrHistogram.DoubleHistogram 11
org.HdrHistogram.DoubleHistogramIterationValue 1
org.HdrHistogram.DoubleHistogram$Percentiles 1
org.HdrHistogram.packedarray.AbstractPackedArrayContext$1 2
org.HdrHistogram.packedarray.IterationValue 4
org.HdrHistogram.AbstractHistogram$LinearBucketValues 1
org.HdrHistogram.AbstractHistogram$RecordedValues 1
org.HdrHistogram.AbstractHistogram$LogarithmicBucketValues 1
org.HdrHistogram.DoubleHistogram$LinearBucketValues 1
org.HdrHistogram.DoubleHistogram$RecordedValues 1
org.HdrHistogram.DoubleHistogram$AllValues 1
org.HdrHistogram.PackedHistogram 6
org.HdrHistogram.ConcurrentHistogram$AtomicLongArrayWithNormalizingOffset:org.HdrHistogram.PackedConcurrentHistogram$ConcurrentPackedArrayWithNormalizingOffset 2
org.HdrHistogram.AllValuesIterator:org.HdrHistogram.LinearIterator:org.HdrHistogram.LogarithmicIterator:org.HdrHistogram.PercentileIterator 1
org.HdrHistogram.HistogramLogReader 15
org.HdrHistogram.HistogramLogReader$1 6
org.HdrHistogram.HistogramLogScanner 4
org.HdrHistogram.HistogramLogScanner$LazyHistogramReader 5
org.HdrHistogram.Base64Helper 1
org.HdrHistogram.ZigZagEncoding 1
org.HdrHistogram.SynchronizedDoubleHistogram 3

Runtime coverage analysis

This section shows analysis of runtime coverage data.

For futher technical details on how this section is generated, please see the Glossary .

Complex functions with low coverage

Func name Function total lines Lines covered at runtime percentage covered Reached by fuzzers
[org.HdrHistogram.DoubleRecorder].getIntervalHistogram(org.HdrHistogram.EncodableHistogram) 88 0 0.0% []
[org.HdrHistogram.PackedConcurrentHistogram].addToTotalCount(long) 56 0 0.0% []
[org.HdrHistogram.SynchronizedDoubleHistogram].setAutoResize(boolean) 102 0 0.0% []
[org.HdrHistogram.packedarray.PackedArrayRecorder].validateFitAsReplacementArray(org.HdrHistogram.packedarray.PackedLongArray,boolean) 66 0 0.0% []
[org.HdrHistogram.packedarray.PackedArraySingleWriterRecorder].validateFitAsReplacementArray(org.HdrHistogram.packedarray.PackedLongArray,boolean) 66 0 0.0% []
[org.HdrHistogram.ZigZagEncoding].getInt(java.nio.ByteBuffer) 43 0 0.0% []
[org.HdrHistogram.ZigZagEncoding].getLong(java.nio.ByteBuffer) 44 0 0.0% []
[org.HdrHistogram.Recorder].getIntervalHistogram(org.HdrHistogram.EncodableHistogram) 101 0 0.0% []
[org.HdrHistogram.DoubleHistogram].findCappedContainingBinaryOrderOfMagnitude(double) 65 0 0.0% []
[org.HdrHistogram.DoubleHistogram].setAutoResize(boolean) 186 0 0.0% []
[org.HdrHistogram.DoubleHistogram].setTag(java.lang.String) 61 0 0.0% ['LogReaderWriterFuzzer']
[org.HdrHistogram.ConcurrentHistogram].setCountAtIndex(int,long) 35 0 0.0% []
[org.HdrHistogram.ConcurrentHistogram].addToTotalCount(long) 49 0 0.0% []
[org.HdrHistogram.SingleWriterDoubleRecorder].getIntervalHistogram(org.HdrHistogram.EncodableHistogram) 92 0 0.0% []
[org.HdrHistogram.HistogramLogProcessor].run() 271 0 0.0% []
[org.HdrHistogram.SynchronizedHistogram].recordValueWithCount(long,long) 38 0 0.0% []
[org.HdrHistogram.SynchronizedHistogram].add(org.HdrHistogram.AbstractHistogram) 57 0 0.0% ['LogReaderWriterFuzzer']
[org.HdrHistogram.SingleWriterRecorder].getIntervalHistogram(org.HdrHistogram.EncodableHistogram) 91 0 0.0% []
[org.HdrHistogram.HistogramLogWriter].getBaseTime() 59 0 0.0% []
[org.HdrHistogram.PackedHistogram].resize(long) 37 0 0.0% []

Files and Directories in report

This section shows which files and directories are considered in this report. The main reason for showing this is fuzz introspector may include more code in the reasoning than is desired. This section helps identify if too many files/directories are included, e.g. third party code, which may be irrelevant for the threat model. In the event too much is included, fuzz introspector supports a configuration file that can exclude data from the report. See the following link for more information on how to create a config file: link

Files in report

Source file Reached by Covered by
org.HdrHistogram.AbstractHistogram$LogarithmicBucketValues ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoubleHistogram ['LogReaderWriterFuzzer'] []
org.HdrHistogram.ZigZagEncoding ['LogReaderWriterFuzzer'] []
org.HdrHistogram.HistogramLogProcessor [] []
org.HdrHistogram.HistogramLogWriter [] []
org.HdrHistogram.PackedDoubleHistogram [] []
org.HdrHistogram.HistogramLogReader$1 ['LogReaderWriterFuzzer'] []
org.HdrHistogram.HistogramIterationValue ['LogReaderWriterFuzzer'] []
org.HdrHistogram.Base64Helper ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoubleHistogram$LinearBucketValues ['LogReaderWriterFuzzer'] []
org.HdrHistogram.packedarray.PackedArraySingleWriterRecorder [] []
org.HdrHistogram.DoubleLogarithmicIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoubleHistogram$Percentiles ['LogReaderWriterFuzzer'] []
org.HdrHistogram.Recorder$InternalPackedConcurrentHistogram [] []
org.HdrHistogram.RecordedValuesIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.packedarray.AbstractPackedArrayContext$1 ['LogReaderWriterFuzzer'] []
org.HdrHistogram.packedarray.PackedArrayRecorder [] []
org.HdrHistogram.packedarray.ConcurrentPackedArrayContext ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoubleHistogramIterationValue ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoublePercentileIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.AbstractHistogram$RecordedValues ['LogReaderWriterFuzzer'] []
org.HdrHistogram.SingleWriterRecorder$PackedInternalHistogram [] []
org.HdrHistogram.SingleWriterDoubleRecorder$InternalDoubleHistogram [] []
org.HdrHistogram.packedarray.ResizeException ['LogReaderWriterFuzzer'] []
org.HdrHistogram.packedarray.ConcurrentPackedLongArray ['LogReaderWriterFuzzer'] []
org.HdrHistogram.HistogramLogScanner ['LogReaderWriterFuzzer'] []
org.HdrHistogram.packedarray.AbstractPackedLongArray$AllValuesIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.SingleWriterRecorder$InternalHistogram [] []
org.HdrHistogram.AbstractHistogram$LinearBucketValues ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoubleHistogram$LogarithmicBucketValues ['LogReaderWriterFuzzer'] []
org.HdrHistogram.AbstractHistogram$Percentiles ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoubleHistogram$RecordedValues ['LogReaderWriterFuzzer'] []
org.HdrHistogram.IntCountsHistogram ['LogReaderWriterFuzzer'] []
org.HdrHistogram.SingleWriterDoubleRecorder [] []
org.HdrHistogram.Recorder$InternalConcurrentHistogram [] []
org.HdrHistogram.Histogram ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoubleRecorder$InternalConcurrentDoubleHistogram [] []
org.HdrHistogram.PercentileIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.Recorder$InternalAtomicHistogram [] []
org.HdrHistogram.AbstractHistogram$AllValues ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoubleRecorder$PackedInternalConcurrentDoubleHistogram [] []
org.HdrHistogram.packedarray.PackedArrayContext ['LogReaderWriterFuzzer'] []
org.HdrHistogram.SingleWriterRecorder [] []
org.HdrHistogram.DoubleHistogram$AllValues ['LogReaderWriterFuzzer'] []
org.HdrHistogram.packedarray.IterationValue ['LogReaderWriterFuzzer'] []
org.HdrHistogram.WriterReaderPhaser ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoubleRecordedValuesIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.packedarray.AbstractPackedArrayContext$NonZeroValuesIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.PackedConcurrentDoubleHistogram [] []
org.HdrHistogram.DoubleRecorder [] []
org.HdrHistogram.LinearIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.ConcurrentHistogram ['LogReaderWriterFuzzer'] []
org.HdrHistogram.Recorder [] []
org.HdrHistogram.HistogramLogReader ['LogReaderWriterFuzzer'] []
org.HdrHistogram.AllValuesIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.HistogramLogScanner$LazyHistogramReader ['LogReaderWriterFuzzer'] []
org.HdrHistogram.ConcurrentDoubleHistogram [] []
org.HdrHistogram.SynchronizedDoubleHistogram ['LogReaderWriterFuzzer'] []
org.HdrHistogram.LogarithmicIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.packedarray.PackedArrayRecorder$InternalConcurrentPackedLongArray [] []
org.HdrHistogram.PackedConcurrentHistogram ['LogReaderWriterFuzzer'] []
org.HdrHistogram.DoubleLinearIterator ['LogReaderWriterFuzzer'] []
org.HdrHistogram.ConcurrentHistogram$AtomicLongArrayWithNormalizingOffset ['LogReaderWriterFuzzer'] []
org.HdrHistogram.SingleWriterDoubleRecorder$PackedInternalDoubleHistogram [] []
org.HdrHistogram.DoubleAllValuesIterator ['LogReaderWriterFuzzer'] []
LogReaderWriterFuzzer ['LogReaderWriterFuzzer'] []
org.HdrHistogram.PackedConcurrentHistogram$ConcurrentPackedArrayWithNormalizingOffset ['LogReaderWriterFuzzer'] []
org.HdrHistogram.PackedHistogram ['LogReaderWriterFuzzer'] []
org.HdrHistogram.SynchronizedHistogram ['LogReaderWriterFuzzer'] []
org.HdrHistogram.packedarray.PackedLongArray ['LogReaderWriterFuzzer'] []
org.HdrHistogram.packedarray.PackedArraySingleWriterRecorder$InternalPackedLongArray [] []
org.HdrHistogram.ShortCountsHistogram ['LogReaderWriterFuzzer'] []
org.HdrHistogram.AtomicHistogram ['LogReaderWriterFuzzer'] []

Directories in report

Directory