diff --git a/engine/flutter/third_party/txt/src/minikin/FontFamily.h b/engine/flutter/third_party/txt/src/minikin/FontFamily.h
index aedb92cf7d9419353ccef960ec01a1369da79302..4abe3a206cdf08c96e871352e2a7172251c949d7 100644
--- a/engine/flutter/third_party/txt/src/minikin/FontFamily.h
+++ b/engine/flutter/third_party/txt/src/minikin/FontFamily.h
@@ -74,6 +74,7 @@ class FontStyle {
 
   static uint32_t pack(int variant, int weight, bool italic);
 
+public:
   uint32_t bits;
   uint32_t mLanguageListId;
 };
diff --git a/engine/flutter/third_party/txt/src/minikin/Hyphenator.h b/engine/flutter/third_party/txt/src/minikin/Hyphenator.h
index a627a6078e8872078b14aa65d781350ca79cf0dc..97ab237db24337378840b9237e38fcffaeca8799 100644
--- a/engine/flutter/third_party/txt/src/minikin/Hyphenator.h
+++ b/engine/flutter/third_party/txt/src/minikin/Hyphenator.h
@@ -120,6 +120,7 @@ class HyphenEdit {
   uint32_t getStart() const { return hyphen & MASK_START_OF_LINE; }
 
  private:
+ public:
   uint32_t hyphen;
 };
 
diff --git a/engine/flutter/third_party/txt/src/minikin/Layout.cpp b/engine/flutter/third_party/txt/src/minikin/Layout.cpp
index 1ce0712f4185b2ec2f7e619ccfd0a877f860b1bb..8cc418162a11675f72465c589dddc437e6f8764a 100644
--- a/engine/flutter/third_party/txt/src/minikin/Layout.cpp
+++ b/engine/flutter/third_party/txt/src/minikin/Layout.cpp
@@ -14,6 +14,12 @@
  * limitations under the License.
  */
 
+#include <unistd.h>
+#include <stdio.h>
+#include <time.h>
+#include <pthread.h>
+#include <codecvt>
+#include <locale>
 #define LOG_TAG "Minikin"
 
 #include <math.h>
@@ -62,7 +68,9 @@ struct LayoutContext {
 // Layout cache datatypes
 
 class LayoutCacheKey {
+  void log2file(FILE *f) const;
  public:
+  void log2file() const;
   LayoutCacheKey(const std::shared_ptr<FontCollection>& collection,
                  const MinikinPaint& paint,
                  FontStyle style,
@@ -145,7 +153,9 @@ class LayoutCache : private android::OnEntryRemoved<LayoutCacheKey, Layout*> {
       key.copyText();
       layout = new Layout();
       key.doLayout(layout, ctx, collection);
+      key.log2file();
       mCache.put(key, layout);
+      ALOGE(mCache.size());
     }
     return layout;
   }
@@ -185,6 +195,40 @@ class LayoutEngine {
   }
 };
 
+void LayoutCacheKey::log2file(FILE *f) const
+{
+  time_t t=time(0);
+  static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
+  pthread_mutex_lock(&m);
+  fprintf(f, "%.24s: LayoutCacheKey(%p): mId(%u), mStart(%zu), mCount(%zu), mStyle(%u,%u), mSize(%f), mScaleX(%f), mSkewX(%f), mLetterSpacing(%f), mPaintFlags(%d), mHyphenEdit(%u), mIsRtl(%d), mNchars(%zu), mChars(",
+          ctime(&t), this, mId , mStart , mCount , mStyle.bits, mStyle.mLanguageListId , mSize , mScaleX , mSkewX , mLetterSpacing , mPaintFlags , mHyphenEdit.hyphen , mIsRtl , mNchars);
+  if (mNchars) fprintf(f, "%04hx", mChars[0]);
+  for (size_t i=1; i<mNchars; ++i) {
+    fprintf(f, " %04hx", mChars[i]);
+  }
+  fprintf(f, ")");
+  std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> conv;
+  char16_t *p = (char16_t*)mChars;
+  static_assert(sizeof(char16_t) == sizeof(uint16_t), "char16_t == uint16_t");
+  auto s = conv.to_bytes(p, p+mNchars);
+  fprintf(f, "(%s)", s.c_str());
+  fprintf(f, "\n");
+  pthread_mutex_unlock(&m);
+}
+
+void LayoutCacheKey::log2file() const
+{
+  char tmp[64];
+  sprintf(tmp, "/dev/asan/LayoutCacheKey_%d.txt", getpid());
+  FILE *fp = fopen(tmp, "a");
+  if (fp) {
+    log2file(fp);
+    fclose(fp);
+  } else {
+    ALOGE("open LayoutCacheKey log file fail");
+  }
+}
+
 bool LayoutCacheKey::operator==(const LayoutCacheKey& other) const {
   return mId == other.mId && mStart == other.mStart && mCount == other.mCount &&
          mStyle == other.mStyle && mSize == other.mSize &&