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fix: the fuzzer's corpus reaches Cover-Branches suites on reactive programs - #95
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A reactive while(1) program ends every execution in a failed assumption; the witness replay longjmp'd out without writing klee_log.csv, so the fuzzer's corpus never reached the Cover-Branches suite (Hardness median: 2 tests in the Test-Comp 2027 pre-run).
With it, the validator's harness reproduces the abort(), and gcov writes nothing for a test that aborts: 44 such tests measured 2.38% where the 21 KLEE paths ending in exit gave 62.7% (hardness_kloop_100_1loop_file-32). Without it, the harness runs out of inputs at that read and exits.
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Test-Comp 2027 pre-run: on reactive programs (
while (1)withassume_abort_if_not, mostly Hardness), every fuzzer execution ends in a failed assumption. The witness replay that turns a queue entry into a test case jumped out without writing the nondet log, so every entry was dropped (median Hardness suite: 2 tests).hardness_kloop_100_1loop_file-32: 62.7% → 2.4%).tests/integration/test_fuzzer_pruned_corpus.sh(in CI).A/B on 24 Cover-Branches tasks (900 s, 3 GB, 1 core, TestCov gcc), against Zenodo 24031752: sum 7.81 → 13.56, higher on 13 tasks, lower on none. Details in
docs/reports/tacas-experiment-log.md.