pkg/fuzzer: use the signal union in minimize iterations

During deflake(), we look at the unions of the signal from multiple
iterations. Let's do the same in minimize(), it would be more
consistent.

1 files changed, 7 insertions, 1 deletions

diff --git a/pkg/fuzzer/job.go b/pkg/fuzzer/job.go
index 37aaef7d4..84d3af930 100644
--- a/pkg/fuzzer/job.go
+++ b/pkg/fuzzer/job.go
@@ -252,6 +252,7 @@ func (job *triageJob) minimize(call int, info *triageCall) (*prog.Prog, int) {
 			if stop {
 				return false
 			}
+			var mergedSignal signal.Signal
 			for i := 0; i < minimizeAttempts; i++ {
 				result := job.execute(&queue.Request{
 					Prog:            p1,
@@ -268,7 +269,12 @@ func (job *triageJob) minimize(call int, info *triageCall) (*prog.Prog, int) {
 					continue
 				}
 				thisSignal := getSignalAndCover(p1, result.Info, call1)
-				if info.newStableSignal.Intersection(thisSignal).Len() == info.newStableSignal.Len() {
+				if mergedSignal.Len() == 0 {
+					mergedSignal = thisSignal
+				} else {
+					mergedSignal.Merge(thisSignal)
+				}
+				if info.newStableSignal.Intersection(mergedSignal).Len() == info.newStableSignal.Len() {
 					return true
 				}
 			}