diff --git a/components/viz/service/display_embedder/skia_output_device_buffer_queue.cc b/components/viz/service/display_embedder/skia_output_device_buffer_queue.cc
--- a/components/viz/service/display_embedder/skia_output_device_buffer_queue.cc
+++ b/components/viz/service/display_embedder/skia_output_device_buffer_queue.cc
@@ -12,6 +12,7 @@
 #include "base/functional/bind.h"
 #include "base/memory/raw_ptr.h"
 #include "base/notimplemented.h"
+#include "base/threading/platform_thread.h"
 #include "base/time/default_tick_clock.h"
 #include "build/build_config.h"
 #include "components/viz/common/quads/compositor_frame_metadata.h"
@@ -226,6 +227,18 @@ SkiaOutputDeviceBufferQueue::~SkiaOutputDeviceBufferQueue() {
       overlay.OnContextLost();
     }
   }
+  // POC instrumentation (CompositorGpuThread under DrDc): explicitly destroy
+  // overlays_ first to drop the OverlayAHBImageRepresentation ref on the
+  // backing under SharedImageManager::lock_, then sleep so a concurrent
+  // DestroySharedImage on GPU main can take the last backing ref and call
+  // non-atomic OverlayImage::Release() while ~presenter_ below releases the
+  // ScopedHardwareBufferFenceSyncImpl ref on this thread.
+  LOG(ERROR) << "POC: ~SkiaOutputDeviceBufferQueue overlays_.size()="
+             << overlays_.size();
+  overlays_.clear();
+  LOG(ERROR) << "POC: overlays_ cleared, sleeping 200ms before ~presenter_";
+  base::PlatformThread::Sleep(base::Milliseconds(200));
+  // presenter_ destroyed by member-dtor order after this body returns.
 }

 const SkiaOutputDeviceBufferQueue::OverlayData*
diff --git a/gpu/command_buffer/service/shared_image/ahardwarebuffer_image_backing_factory.cc b/gpu/command_buffer/service/shared_image/ahardwarebuffer_image_backing_factory.cc
--- a/gpu/command_buffer/service/shared_image/ahardwarebuffer_image_backing_factory.cc
+++ b/gpu/command_buffer/service/shared_image/ahardwarebuffer_image_backing_factory.cc
@@ -111,7 +111,13 @@ class OverlayImage final : public base::RefCounted<OverlayImage> {
     scoped_refptr<OverlayImage> image_;
   };

-  ~OverlayImage() = default;
+  ~OverlayImage() {
+    // POC instrumentation: under the race, both threads enter this dtor.
+    // ASAN reports heap-use-after-free on the second entry; in a release
+    // build the double-dtor double-releases handle_ and double-closes the
+    // fence FDs.
+    LOG(ERROR) << "POC: ~OverlayImage this=" << this;
+  }

   base::android::ScopedHardwareBufferHandle handle_;