FuzzBench: sbft-standard-cov-01-16 report

experiment summary

We show two different aggregate (cross-benchmark) rankings of fuzzers. The first is based on the average of per-benchmarks scores, where the score represents the percentage of the highest reached median code-coverage on a given benchmark (higher value is better). The second ranking shows the average rank of fuzzers, after we rank them on each benchmark according to their median reached code-covereges (lower value is better).

By avg. score

	average normalized score
fuzzer
libafl	97.05
mystique	96.85
fox	95.31
libfuzzer	94.11
bandfuzz	88.40
tunefuzz	86.61
pastis	60.83

By avg. rank

	average rank
fuzzer
bandfuzz	2.89
tunefuzz	3.44
fox	3.56
libfuzzer	3.89
libafl	4.22
pastis	4.67
mystique	4.89

Critical difference diagram

The diagram visualizes the average rank of fuzzers (second ranking above) while showing the significance of the differences as well. What is considered a "critical difference" (CD) is based on the Friedman/Nemenyi post-hoc test. See more in the documentation.

Note: If a fuzzer does not support all benchmarks, its ranking as shown in this diagram can be lower than it should be. So please check the list of supported benchmarks for the fuzzer(s) of your interest. The list could be specified in the fuzzer's README.md like this.

Median relative code-coverages on each benchmark

Note: The relative coverage summary table shows the median relative performance of each fuzzer to the experiment maximum. Thus the highest relative performance may not be 100%.
trial_relative_coverage = trial_coverage / experiment_max_coverage

	bandfuzz	libafl	tunefuzz	mystique	fox	libfuzzer	pastis
FuzzerMedian	97.50	95.00	95.00	95.00	97.00	94.00	95.00
FuzzerMean	97.00	94.44	94.38	94.22	92.89	91.44	88.00
freetype2_ftfuzzer	97.00	84.00	86.00	85.00	80.00	71.00	nan
jsoncpp_jsoncpp_fuzzer	99.00	98.00	nan	98.00	98.00	100.00	nan
lcms_cms_transform_fuzzer	93.00	93.00	93.00	91.00	75.00	88.00	91.00
libxml2_xml	98.00	98.00	98.00	98.00	99.00	96.00	nan
libxslt_xpath	98.00	96.00	98.00	96.00	99.00	90.00	51.00
re2_fuzzer	99.00	98.00	99.00	98.00	99.00	99.00	99.00
stb_stbi_read_fuzzer	nan	95.00	91.00	94.00	95.00	87.00	96.00
vorbis_decode_fuzzer	95.00	93.00	94.00	93.00	94.00	94.00	94.00
zlib_zlib_uncompress_fuzzer	97.00	95.00	96.00	95.00	97.00	98.00	97.00

Fuzzers are sorted by "FuzzerMean" (average median relative coverage), highest on the left.
Green background = highest relative median coverage.
Blue gradient background = greater than 95% relative median coverage.

freetype2_ftfuzzer summary

Ranking by median reached code coverage

Mean code coverage growth over time

* The error bands show the 95% confidence interval around the mean code coverage.

Sample statistics and statistical significance (code coverage)

Code coverage sample statistics

		count	mean	std	min	25%	median	75%	max
fuzzer	time
bandfuzz	82800	17.0	12860.764706	438.742454	11722.0	12737.00	13032.0	13128.00	13341.0
tunefuzz	82800	19.0	11537.263158	226.400050	10862.0	11441.00	11573.0	11698.00	11820.0
mystique	82800	17.0	11292.000000	500.419449	10320.0	10950.00	11376.0	11499.00	12186.0
libafl	82800	16.0	11325.187500	491.332639	10607.0	11027.75	11208.5	11544.00	12358.0
fox	82800	18.0	10660.944444	353.284333	9986.0	10420.25	10759.5	10870.50	11180.0
libfuzzer	82800	18.0	9517.722222	482.977141	8573.0	9305.00	9567.0	9861.75	10293.0

Vargha-Delaney A12 measure

The table summarizes the A12 values from the pairwise Vargha-Delaney A measure of effect size. Green cells indicate the probability the fuzzer in the row will outperform the fuzzer in the column.

Mann-Whitney U test

The table summarizes the p values of pairwise Mann-Whitney U tests. Green cells indicate that the reached coverage distribution of a given fuzzer pair is significantly different.

Unique code coverage plots

Ranking by unique code branches covered
Each bar shows the total number of code branches found by a given fuzzer. The colored area shows the number of unique code branches (i.e., branches that were not covered by any other fuzzers).

Pairwise unique code coverage
Each cell represents the number of code branches covered by the fuzzer of the column but not by the fuzzer of the row

Code coverage reports for each fuzzer on this benchmark

bandfuzz fox libafl libfuzzer mystique pastis tunefuzz