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fuzzer: log errors and move deduplicated runs to shared mem

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This commit is contained in:
Andrew Kelley 2024-07-29 21:59:23 -07:00
parent 97643c1ecc
commit ffc050e055
1 changed files with 5 additions and 8 deletions
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13
lib/fuzzer.zig
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@ -16,7 +16,6 @@ fn logOverride(
comptime format: []const u8,
args: anytype,
) void {
if (builtin.mode != .Debug) return;
const f = if (log_file) |f| f else f: {
const f = fuzzer.dir.createFile("libfuzzer.log", .{}) catch @panic("failed to open fuzzer log file");
log_file = f;
@ -27,7 +26,7 @@ fn logOverride(
f.writer().print(prefix1 ++ prefix2 ++ format ++ "\n", args) catch @panic("failed to write to fuzzer log");
}
export threadlocal var __sancov_lowest_stack: usize = 0;
export threadlocal var __sancov_lowest_stack: usize = std.math.maxInt(usize);
var module_count_8bc: usize = 0;
var module_count_pcs: usize = 0;
@ -108,7 +107,6 @@ const Fuzzer = struct {
pc_counters: []u8,
n_runs: usize,
recent_cases: RunMap,
deduplicated_runs: usize,
/// Data collected from code coverage instrumentation from one execution of
/// the test function.
coverage: Coverage,
@ -120,6 +118,7 @@ const Fuzzer = struct {
const SeenPcsHeader = extern struct {
n_runs: usize,
deduplicated_runs: usize,
pcs_len: usize,
lowest_stack: usize,
};
@ -229,6 +228,7 @@ const Fuzzer = struct {
} else {
const header: SeenPcsHeader = .{
.n_runs = 0,
.deduplicated_runs = 0,
.pcs_len = flagged_pcs.len,
.lowest_stack = std.math.maxInt(usize),
};
@ -273,7 +273,8 @@ const Fuzzer = struct {
});
if (gop.found_existing) {
//std.log.info("duplicate analysis: score={d} id={d}", .{ analysis.score, analysis.id });
f.deduplicated_runs += 1;
const header: *volatile SeenPcsHeader = @ptrCast(f.seen_pcs.items[0..@sizeOf(SeenPcsHeader)]);
_ = @atomicRmw(usize, &header.deduplicated_runs, .Add, 1, .monotonic);
if (f.input.items.len < gop.key_ptr.input.len or gop.key_ptr.score == 0) {
gpa.free(gop.key_ptr.input);
gop.key_ptr.input = try gpa.dupe(u8, f.input.items);
@ -348,9 +349,6 @@ const Fuzzer = struct {
}
fn dumpStats(f: *Fuzzer) void {
std.log.info("stats: runs={d} deduplicated={d}", .{
f.n_runs, f.deduplicated_runs,
});
for (f.recent_cases.keys()[0..@min(f.recent_cases.entries.len, 5)], 0..) |run, i| {
std.log.info("best[{d}] id={x} score={d} input: '{}'", .{
i, run.id, run.score, std.zig.fmtEscapes(run.input),
@ -397,7 +395,6 @@ var fuzzer: Fuzzer = .{
.flagged_pcs = undefined,
.pc_counters = undefined,
.n_runs = 0,
.deduplicated_runs = 0,
.recent_cases = .{},
.coverage = undefined,
.dir = undefined,