diff --git a/include/cutils/trace.h b/include/cutils/trace.h
index 6d9b3bc..9c077d6 100644
--- a/include/cutils/trace.h
+++ b/include/cutils/trace.h
@@ -71,7 +71,7 @@
 #define ATRACE_TAG_LAST             ATRACE_TAG_PACKAGE_MANAGER
 
 // Reserved for initialization.
-#define ATRACE_TAG_NOT_READY        (1LL<<63)
+#define ATRACE_TAG_NOT_READY        (1ULL<<63)
 
 #define ATRACE_TAG_VALID_MASK ((ATRACE_TAG_LAST - 1) | ATRACE_TAG_LAST)
 
diff --git a/libcutils/Android.mk b/libcutils/Android.mk
index 5330949..f9060c4 100644
--- a/libcutils/Android.mk
+++ b/libcutils/Android.mk
@@ -123,6 +123,8 @@
 LOCAL_C_INCLUDES := $(libcutils_c_includes)
 LOCAL_STATIC_LIBRARIES := liblog
 LOCAL_CFLAGS += -Werror -Wall -Wextra -std=gnu90
+LOCAL_CLANG := true
+LOCAL_SANITIZE := integer
 include $(BUILD_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -133,6 +135,8 @@
 LOCAL_SHARED_LIBRARIES := liblog
 LOCAL_CFLAGS += -Werror -Wall -Wextra
 LOCAL_C_INCLUDES := $(libcutils_c_includes)
+LOCAL_CLANG := true
+LOCAL_SANITIZE := integer
 include $(BUILD_SHARED_LIBRARY)
 
 include $(call all-makefiles-under,$(LOCAL_PATH))
diff --git a/libcutils/hashmap.c b/libcutils/hashmap.c
index 65539ea..ede3b98 100644
--- a/libcutils/hashmap.c
+++ b/libcutils/hashmap.c
@@ -77,6 +77,9 @@
 /**
  * Hashes the given key.
  */
+#ifdef __clang__
+__attribute__((no_sanitize("integer")))
+#endif
 static inline int hashKey(Hashmap* map, void* key) {
     int h = map->hash(key);
 
@@ -152,6 +155,10 @@
     free(map);
 }
 
+#ifdef __clang__
+__attribute__((no_sanitize("integer")))
+#endif
+/* FIXME: relies on signed integer overflow, which is undefined behavior */
 int hashmapHash(void* key, size_t keySize) {
     int h = keySize;
     char* data = (char*) key;
diff --git a/libcutils/str_parms.c b/libcutils/str_parms.c
index 924289a..4f23d09 100644
--- a/libcutils/str_parms.c
+++ b/libcutils/str_parms.c
@@ -42,6 +42,9 @@
 }
 
 /* use djb hash unless we find it inadequate */
+#ifdef __clang__
+__attribute__((no_sanitize("integer")))
+#endif
 static int str_hash_fn(void *str)
 {
     uint32_t hash = 5381;
diff --git a/logd/LogBuffer.cpp b/logd/LogBuffer.cpp
index 6ea4109..c609870 100644
--- a/logd/LogBuffer.cpp
+++ b/logd/LogBuffer.cpp
@@ -467,7 +467,11 @@
             // unmerged drop message
             if (dropped) {
                 last.add(e);
-                mLastWorstUid[id][e->getUid()] = it;
+                if ((e->getUid() == worst)
+                        || (mLastWorstUid[id].find(e->getUid())
+                            == mLastWorstUid[id].end())) {
+                    mLastWorstUid[id][e->getUid()] = it;
+                }
                 ++it;
                 continue;
             }