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fuzz: Use __AFL_SHM_ID for naming test directories

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Use the AFL++ shared memory ID environment variable to create
a deterministic datadir path. This prevents accumulation of stale
directories after a fuzz iteration crashes or times out. During
long fuzz campaigns, this accumulation has occasionally resulted
in running out of disk space.
This commit is contained in:
marcofleon 2026-01-28 16:50:34 +00:00
parent f7e0c3d3d3
commit d3e681bc06
1 changed files with 11 additions and 2 deletions
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13
src/test/util/setup_common.cpp
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@ -161,8 +161,17 @@ BasicTestingSetup::BasicTestingSetup(const ChainType chainType, TestOpts opts)
// tests, such as the fuzz tests to run in several processes at the
// same time, add a random element to the path. Keep it small enough to
// avoid a MAX_PATH violation on Windows.
const auto rand{HexStr(g_rng_temp_path.randbytes(10))};
m_path_root = fs::temp_directory_path() / TEST_DIR_PATH_ELEMENT / test_name / rand;
//
// When fuzzing with AFL++, use the shared memory ID for a deterministic
// path. This allows for cleanup of leftover directories from timed-out
// or crashed iterations, preventing accumulation of stale datadirs.
if (const char* shm_id = std::getenv("__AFL_SHM_ID"); shm_id && *shm_id) {
m_path_root = fs::temp_directory_path() / TEST_DIR_PATH_ELEMENT / test_name / shm_id;
fs::remove_all(m_path_root);
} else {
const auto rand{HexStr(g_rng_temp_path.randbytes(10))};
m_path_root = fs::temp_directory_path() / TEST_DIR_PATH_ELEMENT / test_name / rand;
}
TryCreateDirectories(m_path_root);
} else {
// Custom data directory