diff --git a/libs/gui/BLASTBufferQueue.cpp b/libs/gui/BLASTBufferQueue.cpp
index 8b9a878..fc8aff8 100644
--- a/libs/gui/BLASTBufferQueue.cpp
+++ b/libs/gui/BLASTBufferQueue.cpp
@@ -167,14 +167,15 @@
     mNumFrameAvailable = 0;
 
     TransactionCompletedListener::getInstance()->addQueueStallListener(
-        [&]() {
-            std::function<void(bool)> callbackCopy;
-            {
-                std::unique_lock _lock{mMutex};
-                callbackCopy = mTransactionHangCallback;
-            }
-            if (callbackCopy) callbackCopy(true);
-        }, this);
+            [&](const std::string& reason) {
+                std::function<void(const std::string&)> callbackCopy;
+                {
+                    std::unique_lock _lock{mMutex};
+                    callbackCopy = mTransactionHangCallback;
+                }
+                if (callbackCopy) callbackCopy(reason);
+            },
+            this);
 
     BQA_LOGV("BLASTBufferQueue created");
 }
@@ -1112,7 +1113,8 @@
     return SurfaceControl::isSameSurface(mSurfaceControl, surfaceControl);
 }
 
-void BLASTBufferQueue::setTransactionHangCallback(std::function<void(bool)> callback) {
+void BLASTBufferQueue::setTransactionHangCallback(
+        std::function<void(const std::string&)> callback) {
     std::unique_lock _lock{mMutex};
     mTransactionHangCallback = callback;
 }
diff --git a/libs/gui/ITransactionCompletedListener.cpp b/libs/gui/ITransactionCompletedListener.cpp
index ca91afa..2a114c8 100644
--- a/libs/gui/ITransactionCompletedListener.cpp
+++ b/libs/gui/ITransactionCompletedListener.cpp
@@ -273,15 +273,17 @@
 
     void onReleaseBuffer(ReleaseCallbackId callbackId, sp<Fence> releaseFence,
                          uint32_t currentMaxAcquiredBufferCount) override {
-        callRemoteAsync<decltype(
-                &ITransactionCompletedListener::onReleaseBuffer)>(Tag::ON_RELEASE_BUFFER,
-                                                                  callbackId, releaseFence,
-                                                                  currentMaxAcquiredBufferCount);
+        callRemoteAsync<decltype(&ITransactionCompletedListener::
+                                         onReleaseBuffer)>(Tag::ON_RELEASE_BUFFER, callbackId,
+                                                           releaseFence,
+                                                           currentMaxAcquiredBufferCount);
     }
 
-    void onTransactionQueueStalled() override {
-        callRemoteAsync<decltype(&ITransactionCompletedListener::onTransactionQueueStalled)>(
-            Tag::ON_TRANSACTION_QUEUE_STALLED);
+    void onTransactionQueueStalled(const String8& reason) override {
+        callRemoteAsync<
+                decltype(&ITransactionCompletedListener::
+                                 onTransactionQueueStalled)>(Tag::ON_TRANSACTION_QUEUE_STALLED,
+                                                             reason);
     }
 };
 
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index a5879a7..9efdd35 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -455,23 +455,24 @@
     }
 }
 
-void TransactionCompletedListener::onTransactionQueueStalled() {
-      std::unordered_map<void*, std::function<void()>> callbackCopy;
-      {
-          std::scoped_lock<std::mutex> lock(mMutex);
-          callbackCopy = mQueueStallListeners;
-      }
-      for (auto const& it : callbackCopy) {
-          it.second();
-      }
+void TransactionCompletedListener::onTransactionQueueStalled(const String8& reason) {
+    std::unordered_map<void*, std::function<void(const std::string&)>> callbackCopy;
+    {
+        std::scoped_lock<std::mutex> lock(mMutex);
+        callbackCopy = mQueueStallListeners;
+    }
+    for (auto const& it : callbackCopy) {
+        it.second(reason.c_str());
+    }
 }
 
-void TransactionCompletedListener::addQueueStallListener(std::function<void()> stallListener,
-                                                         void* id) {
+void TransactionCompletedListener::addQueueStallListener(
+        std::function<void(const std::string&)> stallListener, void* id) {
     std::scoped_lock<std::mutex> lock(mMutex);
     mQueueStallListeners[id] = stallListener;
 }
-void TransactionCompletedListener::removeQueueStallListener(void *id) {
+
+void TransactionCompletedListener::removeQueueStallListener(void* id) {
     std::scoped_lock<std::mutex> lock(mMutex);
     mQueueStallListeners.erase(id);
 }
diff --git a/libs/gui/include/gui/BLASTBufferQueue.h b/libs/gui/include/gui/BLASTBufferQueue.h
index 827a6cc..957652e 100644
--- a/libs/gui/include/gui/BLASTBufferQueue.h
+++ b/libs/gui/include/gui/BLASTBufferQueue.h
@@ -113,12 +113,10 @@
     uint64_t getLastAcquiredFrameNum();
 
     /**
-     * Set a callback to be invoked when we are hung. The boolean parameter
-     * indicates whether the hang is due to an unfired fence.
-     * TODO: The boolean is always true atm, unfired fence is
-     * the only case we detect.
+     * Set a callback to be invoked when we are hung. The string parameter
+     * indicates the reason for the hang.
      */
-    void setTransactionHangCallback(std::function<void(bool)> callback);
+    void setTransactionHangCallback(std::function<void(const std::string&)> callback);
 
     virtual ~BLASTBufferQueue();
 
@@ -282,7 +280,7 @@
     bool mAppliedLastTransaction = false;
     uint64_t mLastAppliedFrameNumber = 0;
 
-    std::function<void(bool)> mTransactionHangCallback;
+    std::function<void(const std::string&)> mTransactionHangCallback;
 
     std::unordered_set<uint64_t> mSyncedFrameNumbers GUARDED_BY(mMutex);
 };
diff --git a/libs/gui/include/gui/ITransactionCompletedListener.h b/libs/gui/include/gui/ITransactionCompletedListener.h
index cc136bb..d2a6f40 100644
--- a/libs/gui/include/gui/ITransactionCompletedListener.h
+++ b/libs/gui/include/gui/ITransactionCompletedListener.h
@@ -194,7 +194,8 @@
 
     virtual void onReleaseBuffer(ReleaseCallbackId callbackId, sp<Fence> releaseFence,
                                  uint32_t currentMaxAcquiredBufferCount) = 0;
-    virtual void onTransactionQueueStalled() = 0;
+
+    virtual void onTransactionQueueStalled(const String8& name) = 0;
 };
 
 class BnTransactionCompletedListener : public SafeBnInterface<ITransactionCompletedListener> {
diff --git a/libs/gui/include/gui/SurfaceComposerClient.h b/libs/gui/include/gui/SurfaceComposerClient.h
index 36969db..9efde6c 100644
--- a/libs/gui/include/gui/SurfaceComposerClient.h
+++ b/libs/gui/include/gui/SurfaceComposerClient.h
@@ -786,7 +786,7 @@
     // This is protected by mSurfaceStatsListenerMutex, but GUARDED_BY isn't supported for
     // std::recursive_mutex
     std::multimap<int32_t, SurfaceStatsCallbackEntry> mSurfaceStatsListeners;
-    std::unordered_map<void*, std::function<void()>> mQueueStallListeners;
+    std::unordered_map<void*, std::function<void(const std::string&)>> mQueueStallListeners;
 
 public:
     static sp<TransactionCompletedListener> getInstance();
@@ -804,7 +804,7 @@
             const sp<SurfaceControl>& surfaceControl,
             const std::unordered_set<CallbackId, CallbackIdHash>& callbackIds);
 
-    void addQueueStallListener(std::function<void()> stallListener, void* id);
+    void addQueueStallListener(std::function<void(const std::string&)> stallListener, void* id);
     void removeQueueStallListener(void *id);
 
     /*
@@ -835,7 +835,7 @@
     // For Testing Only
     static void setInstance(const sp<TransactionCompletedListener>&);
 
-    void onTransactionQueueStalled() override;
+    void onTransactionQueueStalled(const String8& reason) override;
 
 private:
     ReleaseBufferCallback popReleaseBufferCallbackLocked(const ReleaseCallbackId&);