Index: lib/fuzzer/FuzzerDriver.cpp
===================================================================
--- lib/fuzzer/FuzzerDriver.cpp
+++ lib/fuzzer/FuzzerDriver.cpp
@@ -19,6 +19,7 @@
 #include "FuzzerShmem.h"
 #include "FuzzerTracePC.h"
 #include <algorithm>
+#include <array>
 #include <atomic>
 #include <chrono>
 #include <cstdlib>
@@ -273,12 +274,31 @@
   T.detach();
 }
 
+static size_t kMaxFeature = (1 << 17) + (1 << 15);
+
+static void DumpCoverageFeature(
+    const char *InputFilePath,
+    const std::array<uint8_t, kMaxFeature / 8> &Features) {
+  std::string FilePath(InputFilePath);
+
+  FILE *Out = fopen(FilePath.c_str(), "w");
+  if (!Out) return;
+  fwrite(Features.data(), sizeof(Features[0]), Features.size(), Out);
+}
+
 int RunOneTest(Fuzzer *F, const char *InputFilePath, size_t MaxLen) {
   Unit U = FileToVector(InputFilePath);
   if (MaxLen && MaxLen < U.size())
     U.resize(MaxLen);
   F->ExecuteCallback(U.data(), U.size());
-  F->TryDetectingAMemoryLeak(U.data(), U.size(), true);
+  // F->TryDetectingAMemoryLeak(U.data(), U.size(), true);
+  std::array<uint8_t, kMaxFeature / 8> Features;
+  TPC.CollectFeatures([&](size_t Feature) {
+      size_t position = Feature / 8;
+      size_t power = Feature % 8;
+      Features[position] |= 1 << power;
+    });
+  DumpCoverageFeature(InputFilePath, Features);
   return 0;
 }
 
Index: lib/fuzzer/FuzzerLoop.cpp
===================================================================
--- lib/fuzzer/FuzzerLoop.cpp
+++ lib/fuzzer/FuzzerLoop.cpp
@@ -434,6 +434,8 @@
   }
 }
 
+// static size_t kMaxFeature = 0;
+
 bool Fuzzer::RunOne(const uint8_t *Data, size_t Size, bool MayDeleteFile,
                     InputInfo *II, bool *FoundUniqFeatures) {
   if (!Size)
@@ -454,6 +456,12 @@
                              II->UniqFeatureSet.end(), Feature))
         FoundUniqFeaturesOfII++;
   });
+  // Vector<size_t> Features;
+  // TPC.CollectFeatures([&](size_t Feature) {
+  //     Features.push_back(Feature);
+  //   });
+  // if (Features.back() > kMaxFeature)
+  //   kMaxFeature = Features.back();
   if (FoundUniqFeatures)
     *FoundUniqFeatures = FoundUniqFeaturesOfII;
   PrintPulseAndReportSlowInput(Data, Size);
@@ -751,8 +759,10 @@
       RereadOutputCorpus(MaxInputLen);
       LastCorpusReload = system_clock::now();
     }
-    if (TotalNumberOfRuns >= Options.MaxNumberOfRuns)
+    if (TotalNumberOfRuns >= Options.MaxNumberOfRuns) {
+//      Printf("Max feature: %zd\n", kMaxFeature);
       break;
+    }
     if (TimedOut())
       break;