Bug 237588 – [GTK][WPE] Crash during the WebPage::close() related to GL resources destruction

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKit2

[Pablo Saavedra]

```
#0  __libc_do_syscall () at libc-do-syscall.S:49
#1  0x748eda56 in __libc_signal_restore_set (set=0x689fe6c0) at ../sysdeps/unix/sysv/linux/internal-signals.h:86
#2  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:48
#3  0x748de768 in __GI_abort () at abort.c:79
#4  0x744eb84c in get_dlopen_handle (handle=<optimized out>, exit_on_fail=true, load=true, lib_name=0x745094b0 "libGL.so.1") at ../libepoxy-1.5.4/src/dispatch_common.c:316
#5  get_dlopen_handle (handle=<optimized out>, lib_name=0x745094b0 "libGL.so.1", exit_on_fail=<optimized out>, load=<optimized out>) at ../libepoxy-1.5.4/src/dispatch_common.c:293
#6  0x744eb890 in epoxy_load_gl () at ../libepoxy-1.5.4/src/dispatch_common.c:683
#7  0x744ebd8e in epoxy_gl_dlsym (name=0x744f98d8 <entrypoint_strings+10212> "glDeleteTextures") at ../libepoxy-1.5.4/src/dispatch_common.c:691
#8  epoxy_get_core_proc_address (name=0x744f98d8 <entrypoint_strings+10212> "glDeleteTextures", core_version=<optimized out>) at ../libepoxy-1.5.4/src/dispatch_common.c:765
#9  0x744c5308 in epoxy_glDeleteTextures_resolver () at src/gl_generated_dispatch.c:81936
#10 epoxy_glDeleteTextures_global_rewrite_ptr (n=1, textures=0x6cd1bb14) at src/gl_generated_dispatch.c:49476
#11 0x75ff8ffa in WebCore::BitmapTextureGL::copyFromExternalTexture(unsigned int) () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#12 0x75ff90ec in WebCore::BitmapTextureGL::copyFromExternalTexture(unsigned int) () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#13 0x7504fe7e in WebCore::CoordinatedBackingStoreTile::~CoordinatedBackingStoreTile() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#14 0x75058a54 in Nicosia::BackingStoreTextureMapperImpl::updateTile(unsigned int, WebCore::SurfaceUpdateInfo const&, WebCore::IntRect const&) () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#15 0x75058a7e in Nicosia::BackingStoreTextureMapperImpl::updateTile(unsigned int, WebCore::SurfaceUpdateInfo const&, WebCore::IntRect const&) () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#16 0x750573ea in Nicosia::CompositionLayer::{unnamed type#1}::CompositionLayer() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#17 0x75057b54 in Nicosia::Scene::State::~State() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#18 0x750571e4 in Nicosia::ContentLayer::~ContentLayer() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#19 0x7505724c in Nicosia::BackingStore::~BackingStore() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#20 0x750579e4 in Nicosia::CompositionLayer::LayerState::~LayerState() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#21 0x750571e4 in Nicosia::ContentLayer::~ContentLayer() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#22 0x7505724c in Nicosia::BackingStore::~BackingStore() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#23 0x750579e4 in Nicosia::CompositionLayer::LayerState::~LayerState() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#24 0x750571e4 in Nicosia::ContentLayer::~ContentLayer() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#25 0x7505724c in Nicosia::BackingStore::~BackingStore() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#26 0x750579e4 in Nicosia::CompositionLayer::LayerState::~LayerState() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#27 0x750571e4 in Nicosia::ContentLayer::~ContentLayer() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#28 0x7505724c in Nicosia::BackingStore::~BackingStore() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#29 0x750579e4 in Nicosia::CompositionLayer::LayerState::~LayerState() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#30 0x750571e4 in Nicosia::ContentLayer::~ContentLayer() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#31 0x7505724c in Nicosia::BackingStore::~BackingStore() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#32 0x75057d36 in Nicosia::SceneIntegration::invalidate() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#33 0x74e4ec12 in WebKit::CoordinatedGraphicsScene::~CoordinatedGraphicsScene() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#34 0x74e52f62 in WTF::Detail::CallableWrapper<WebKit::CompositingRunLoop::performTaskSync(WTF::Function<void ()>&&)::$_5, void>::call() () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#35 0x769194aa in WTF::RunLoop::dispatchAfter(WTF::Seconds, WTF::Function<void ()>&&) () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
#36 0x76954b80 in WTF::Detail::CallableWrapper<WTF::RunLoop::notify(WTF::RunLoop::Event, char const*)::$_2, void, WTF::Observer<void (WTF::RunLoop::Event, WTF::String const&)>&>::call(WTF::Observer<void (WTF::RunLoop::Event, WTF::String const&)>&) () from /webkit/usr/lib/libWPEWebKit-1.0.so.3.16.8
```



The crash happens because the layerFlush() triggered immediately after of the WebPage::close() updates the Nicosia layers  but it has not its corresponding renderLayerTree() as a part of the callbacks workflow. That situation leaves the layers of the CoordinatedGraphicsScene inconsistent respect the changes initiated in the layers by the layerFlush().

We have 2 options here: 1) the layers from the CoordinatedGraphicsScene will not be update until the renderLayerTree or 2) we will call a renderLayerTree() (or something like that) before the purgeGLResources()

What we need from renderLayerTree() is the commitSceneState() the state changes from the m_attributes


Good workflow:

```
2:04 (                thread 1886934752) -- WebPage::WebPage()
2:05 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
2:05 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
2:05 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
2:05 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe647a0).backingStore (&0x6fe649c8)= m_nicosia.backingStore;
2:05 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe5a7a0).backingStore (&0x6fe5a9c8)= m_nicosia.backingStore;
2:05 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe5a020).backingStore (&0x6fe5a248)= m_nicosia.backingStore;
2:05 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe64020).backingStore (&0x6fe64248)= m_nicosia.backingStore;
2:05 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.backingStore (&0x6fe60a20) = Nicosia::BackingStore::create(Nicosia::BackingStoreTextureMapperImpl::createFactory());
2:05 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe58020).backingStore (&0x6fe58248)= m_nicosia.backingStore;
2:05 (     layerFlush thread 1886934752) -- LayerTreeHost::forceRepaint()
2:05 (     layerFlush thread 1886934752) -- CompositingCoordinator::flushPendingLayerChanges() -- BEGIN
2:05 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6feba7a0).backingStore (&0x6feba9c8)= m_nicosia.backingStore;
2:05 (                thread 1886934752) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe649f8 staging.backingStore: &(nil)
2:05 (                thread 1886934752) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe64278 staging.backingStore: &(nil)
2:05 (                thread 1886934752) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6feba9f8 staging.backingStore: &(nil)
2:05 (                thread 1886934752) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe5a278 staging.backingStore: &(nil)
2:05 (                thread 1886934752) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe5a9f8 staging.backingStore: &(nil)
2:05 (                thread 1886934752) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe58278 staging.backingStore: &(nil)
2:05 (     layerFlush thread 1886934752) -- LayerTreeHost::commitSceneState(const CoordinatedGraphicsState& state(&0x6fe8a314))
2:05 (     layerFlush thread 1886934752) -- CompositingCoordinator::flushPendingLayerChanges() -- END
2:05 (renderLayerTree thread 1886934752) --                         ThreadedCompositor::forceRepaint() -- BEGIN
2:05 (renderLayerTree thread 1886934752) --                         ThreadedCompositor::forceRepaint() -- END
2:05 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::renderLayerTree() -- m_scene->applyStateChanges(states)
2:05 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::applyStateChanges() -- BEGIN()
2:05 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::applyStateChanges() -- END()
2:05 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::renderLayerTree() -- m_scene->paintToCurrentGLContext(...)
2:05 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::paintToCurrentGLContext() -- updateSceneState()
2:05 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- BEGIN -- this: 0x6fe5c000
2:05 ( A              thread 1754264208) -- AcceleratedSurfaceLibWPE::initialize() -- frame complete callback -- surface.m_client.frameComplete()
2:05 (!!!  layerFlush thread 1754264208) --                         LayerTreeHost::frameComplete() -- m_compositor->frameComplete()
2:06 (                thread 1886934752) -- WebPage::close()
2:06 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::renderLayerTree() -- m_scene->applyStateChanges(states)
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::applyStateChanges() -- BEGIN()
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::commitSceneState() -- m_nicosia(&0x6fe5c008).scene = state(&0x6fe72a80).scene
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::applyStateChanges() -- END()
2:06 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::renderLayerTree() -- m_scene->paintToCurrentGLContext(...)
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::paintToCurrentGLContext() -- updateSceneState()
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- BEGIN -- this: 0x6fe5c000
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- m_nicosia(&0x6fe5c008).state.layers.size() = 0 )
2:06 (renderLayerTree thread 1877327884) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- m_nicosia.state(&0x6fe77440) = state(&0x688ff290) this: 0x6fe5c000 state(Nicosia::Scene::State): & 0x6fe77440
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- m_nicosia.state.layers.size() = 8 )
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6feba780)->commitState()
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6febac50) = m_state.staging (& 0x6feba9f8)
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe64780)->commitState()
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe64c50) = m_state.staging (& 0x6fe649f8)
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe59780)->commitState()
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe59c50) = m_state.staging (& 0x6fe599f8)
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe59000)->commitState()
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe594d0) = m_state.staging (& 0x6fe59278)
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe58000)->commitState()
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe584d0) = m_state.staging (& 0x6fe58278)
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& 0x6fe60a20) = m_state.staging.backingStore (& 0x6fe60a20)
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe5a000)->commitState()
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe5a4d0) = m_state.staging (& 0x6fe5a278)
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe5a780)->commitState()
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe5ac50) = m_state.staging (& 0x6fe5a9f8)
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe64000)->commitState()
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe644d0) = m_state.staging (& 0x6fe64278)
2:06 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- updateBackingStore() -- compositionState.backingStore (&0x6fe4f060) = CoordinatedBackingStore::create()
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::purgeBackingStores() -- m_nicosia(&0x6ccde7d0).backingStore = nullptr (&0x6fe60a20)
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
2:06 (     layerFlush thread 1886934752) -- LayerTreeHost::~LayerTreeHost -- m_coordinator->invalidate()
2:06 (     layerFlush thread 1886934752) -- CompositingCoordinator::invalidate() BEGIN
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
2:06 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
2:06 (     layerFlush thread 1886934752) -- CompositingCoordinator::purgeBackingStores() -- BEGIN
2:06 (     layerFlush thread 1886934752) -- CompositingCoordinator::purgeBackingStores() -- registeredLayer->purgeBackingStores()
2:06 (     layerFlush thread 1886934752) -- CompositingCoordinator::purgeBackingStores() -- registeredLayer->purgeBackingStores()
2:06 (     layerFlush thread 1886934752) -- CompositingCoordinator::purgeBackingStores() -- END
2:06 (     layerFlush thread 1886934752) -- CompositingCoordinator::invalidate() END
2:06 (     layerFlush thread 1886934752) -- LayerTreeHost::~LayerTreeHost -- m_compositor->invalidate()
2:06 (renderLayerTree thread 1886934752) --                         ThreadedCompositor::invalidate() BEGIN
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- END -- m_nicosia.state.layers.size() = 8 )
2:06 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::invalidate() -- purgeGLResources()
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::purgeGLResources() -- PROPOSAL (not being called now) updateSceneState()
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::purgeGLResources() this: 0x6fe5c000 -- BEGIN
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::purgeGLResources() m_nicosia.scene is not null
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::purgeGLResources() m_nicosia.scene->accessState() -> callback
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe58000))?
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe584d0
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer() -- if (committed.backingStore) -> compositionState(&0x6fef4574).backingStore = nullptr (&0x6fe4f060 )
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe64780))?
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe64c50
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe59780))?
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe59c50
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe59000))?
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe594d0
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6feba780))?
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6febac50
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe5a000))?
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe5a4d0
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe5a780))?
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe5ac50
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe64000))?
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe644d0
2:06 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::purgeGLResources() END
2:06 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::invalidate() -- m_context = nullptr
2:06 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::invalidate() -- m_client.didDestroyGLContext()
2:06 (!!!  layerFlush thread 1754264208) --                         LayerTreeHost::didDestroyGLContext()
2:07 (renderLayerTree thread 1886934752) --                         ThreadedCompositor::invalidate() END
2:07 (     layerFlush thread 1886934752) -- LayerTreeHost::~LayerTreeHost -- delete m_coordinator
2:07 (     layerFlush thread 1886934752) -- CompositingCoordinator::~CompositingCoordinator()
2:07 (     layerFlush thread 1886934752) -- CompositingCoordinator::~CompositingCoordinator() -- registeredLayer->invalidateCoordinator()
2:07 (     layerFlush thread 1886934752) -- CompositingCoordinator::~CompositingCoordinator() -- registeredLayer->invalidateCoordinator()
2:07 (renderLayerTree thread 1886934752) --                 ThreadedCompositor::~ThreadedCompositor()
2:07 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
2:07 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
2:07 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
2:07 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
2:07 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
2:07 (     layerFlush thread 1886934752) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
2:07 (                thread 1886934752) -- WebPage::~WebPage()
```


Problem:

```
0:40 (                thread 1887123168) -- WebPage::WebPage()
0:40 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:40 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:40 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:40 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe647a0).backingStore (&0x6fe649c8)= m_nicosia.backingStore;
0:40 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe5a7a0).backingStore (&0x6fe5a9c8)= m_nicosia.backingStore;
0:40 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe5a020).backingStore (&0x6fe5a248)= m_nicosia.backingStore;
0:40 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe64020).backingStore (&0x6fe64248)= m_nicosia.backingStore;
0:40 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.backingStore (&0x6fe60a20) = Nicosia::BackingStore::create(Nicosia::BackingStoreTextureMapperImpl::createFactory());
0:40 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe58020).backingStore (&0x6fe58248)= m_nicosia.backingStore;
0:40 (     layerFlush thread 1887123168) -- LayerTreeHost::forceRepaint()
0:40 (     layerFlush thread 1887123168) -- CompositingCoordinator::flushPendingLayerChanges() -- BEGIN
0:40 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6feba7a0).backingStore (&0x6feba9c8)= m_nicosia.backingStore;
0:40 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe649f8 staging.backingStore: &(nil)
0:40 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe64278 staging.backingStore: &(nil)
0:40 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6feba9f8 staging.backingStore: &(nil)
0:40 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe5a278 staging.backingStore: &(nil)
0:40 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe5a9f8 staging.backingStore: &(nil)
0:40 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe58278 staging.backingStore: &(nil)
0:40 (     layerFlush thread 1887123168) -- LayerTreeHost::commitSceneState(const CoordinatedGraphicsState& state(&0x6fe8a314))
0:40 (     layerFlush thread 1887123168) -- CompositingCoordinator::flushPendingLayerChanges() -- END
0:40 (renderLayerTree thread 1887123168) --                         ThreadedCompositor::forceRepaint() -- BEGIN
0:40 (renderLayerTree thread 1887123168) --                         ThreadedCompositor::forceRepaint() -- END
0:40 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::renderLayerTree() -- m_scene->applyStateChanges(states)
0:40 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::applyStateChanges() -- BEGIN()
0:40 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::applyStateChanges() -- END()
0:40 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::renderLayerTree() -- m_scene->paintToCurrentGLContext(...)
0:40 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::paintToCurrentGLContext() -- updateSceneState()
0:40 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- BEGIN -- this: 0x6fe5c000
0:40 ( A              thread 1754264208) -- AcceleratedSurfaceLibWPE::initialize() -- frame complete callback -- surface.m_client.frameComplete()
0:40 (!!!  layerFlush thread 1754264208) --                         LayerTreeHost::frameComplete() -- m_compositor->frameComplete()
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::purgeBackingStores() -- m_nicosia(&0x6ccde7d0).backingStore = nullptr (&0x6fe60a20)
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:41 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:42 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::renderLayerTree() -- m_scene->applyStateChanges(states)
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::applyStateChanges() -- BEGIN()
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::commitSceneState() -- m_nicosia(&0x6fe5c008).scene = state(&0x6feb43c0).scene
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::applyStateChanges() -- END()
0:42 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::renderLayerTree() -- m_scene->paintToCurrentGLContext(...)
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene::paintToCurrentGLContext() -- updateSceneState()
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- BEGIN -- this: 0x6fe5c000
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- m_nicosia(&0x6fe5c008).state.layers.size() = 0 )
0:42 (renderLayerTree thread 1877327884) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- m_nicosia.state(&0x6fe77440) = state(&0x688ff290) this: 0x6fe5c000 state(Nicosia::Scene::State): & 0x6fe77440
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- m_nicosia.state.layers.size() = 8 )
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6feba780)->commitState()
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6febac50) = m_state.staging (& 0x6feba9f8)
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe64780)->commitState()
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe64c50) = m_state.staging (& 0x6fe649f8)
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe59780)->commitState()
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe59c50) = m_state.staging (& 0x6fe599f8)
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe59000)->commitState()
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe594d0) = m_state.staging (& 0x6fe59278)
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe58000)->commitState()
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe584d0) = m_state.staging (& 0x6fe58278)
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& 0x6fe60a20) = m_state.staging.backingStore (& 0x6fe60a20)
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe5a000)->commitState()
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe5a4d0) = m_state.staging (& 0x6fe5a278)
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe5a780)->commitState()
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe5ac50) = m_state.staging (& 0x6fe5a9f8)
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- compositionLayer(&0x6fe64000)->commitState()
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed (& 0x6fe644d0) = m_state.staging (& 0x6fe64278)
0:42 (                thread 1754264208) --                         NicosiaPlatformLayer -- commitState() -- m_state.committed.backingStore (& (nil)) = m_state.staging.backingStore (& (nil))
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- updateBackingStore() -- compositionState.backingStore (&0x6fe4e060) = CoordinatedBackingStore::create()

0:42 (     layerFlush thread 1887123168) -- -------- LayerTreeHost::layerFlushTimerFired() -------- BEGIN -------- <<<<<<<<<<<<<<< !!! This layerFlushTimerFired() affects to the state of the layers  and it has not a renderLayerTree() what consolidates those changes in the renderLayerTree thread.

0:42 (     layerFlush thread 1887123168) -- CompositingCoordinator::flushPendingLayerChanges() -- BEGIN
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::updateSceneState() -- END -- m_nicosia.state.layers.size() = 8 )
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe3e020).backingStore (&0x6fe3e248)= m_nicosia.backingStore;
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe3d020).backingStore (&0x6fe3d248)= m_nicosia.backingStore;
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe3e7a0).backingStore (&0x6fe3e9c8)= m_nicosia.backingStore;
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe587a0).backingStore (&0x6fe589c8)= m_nicosia.backingStore;
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.backingStore (&0x650db570) = Nicosia::BackingStore::create(Nicosia::BackingStoreTextureMapperImpl::createFactory());
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x6fe3d7a0).backingStore (&0x6fe3d9c8)= m_nicosia.backingStore;
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.backingStore (&0x650db580) = Nicosia::BackingStore::create(Nicosia::BackingStoreTextureMapperImpl::createFactory());
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::flushCompositingStateForThisLayerOnly() -- m_nicosia.layer->updateState() -- callback -- state(&0x656757a0).backingStore (&0x656759c8)= m_nicosia.backingStore;
0:42 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe3e278 staging.backingStore: &(nil)
0:42 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe3d278 staging.backingStore: &(nil)
0:42 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe3d9f8 staging.backingStore: &(nil)
0:42 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe589f8 staging.backingStore: &(nil)
0:42 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x6fe3e9f8 staging.backingStore: &(nil)
0:42 (                thread 1887123168) --                         NicosiaPlatformLayer.h flushState() -- staging.backingStore = pending.backingStore -- staging: &0x656759f8 staging.backingStore: &(nil)
0:42 (     layerFlush thread 1887123168) -- LayerTreeHost::commitSceneState(const CoordinatedGraphicsState& state(&0x6fe8a314))
0:42 (     layerFlush thread 1887123168) -- CompositingCoordinator::flushPendingLayerChanges() -- END
0:42 (     layerFlush thread 1887123168) -- -------- LayerTreeHost::layerFlushTimerFired() -------- END --------
0:42 (                thread 1887123168) -- WebPage::close()
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::purgeBackingStores() -- m_nicosia(&0x6ccdf0d0).backingStore = nullptr (&0x650db570)
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::purgeBackingStores() -- m_nicosia(&0x6ccbd7d0).backingStore = nullptr (&0x650db580)
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:42 (     layerFlush thread 1887123168) -- LayerTreeHost::~LayerTreeHost -- m_coordinator->invalidate()
0:42 (     layerFlush thread 1887123168) -- CompositingCoordinator::invalidate() BEGIN
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- BEGIN
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- willBeDestroyed()
0:42 (     layerFlush thread 1887123168) -- CoordinatedGraphicsLayer::~CoordinatedGraphicsLayer() -- END
0:42 (     layerFlush thread 1887123168) -- CompositingCoordinator::purgeBackingStores() -- BEGIN
0:42 (     layerFlush thread 1887123168) -- CompositingCoordinator::purgeBackingStores() -- registeredLayer->purgeBackingStores()
0:42 (     layerFlush thread 1887123168) -- CompositingCoordinator::purgeBackingStores() -- registeredLayer->purgeBackingStores()
0:42 (     layerFlush thread 1887123168) -- CompositingCoordinator::purgeBackingStores() -- END
0:42 (     layerFlush thread 1887123168) -- CompositingCoordinator::invalidate() END
0:42 (     layerFlush thread 1887123168) -- LayerTreeHost::~LayerTreeHost -- m_compositor->invalidate()
0:42 (renderLayerTree thread 1887123168) --                         ThreadedCompositor::invalidate() BEGIN
0:42 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::invalidate() -- purgeGLResources()
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::purgeGLResources() -- PROPOSAL (not being called now) updateSceneState()
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::purgeGLResources() this: 0x6fe5c000 -- BEGIN
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::purgeGLResources() m_nicosia.scene is not null
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::purgeGLResources() m_nicosia.scene->accessState() -> callback
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe3d780))?
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe3dc50
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x65675780))?
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x65675c50
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe3e000))?
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe3e4d0
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe58780))?
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe58c50
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe59780))?
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe59c50
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe59000))?
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe594d0
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe3e780))?
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe3ec50
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6feba780))?
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6febac50
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer(CompositionLayer layer(&0x6fe3d000))?
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- removeLayer()? layer.accessCommitted -- callback -- committed: &0x6fe3d4d0
0:42 (renderLayerTree thread 1754264208) --                 CoordinatedGraphicsScene.cpp -- CoordinatedGraphicsScene::purgeGLResources() END
0:42 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::invalidate() -- m_context = nullptr
0:42 (renderLayerTree thread 1754264208) --                 ThreadedCompositor::invalidate() -- m_client.didDestroyGLContext()
0:42 (!!!  layerFlush thread 1754264208) --                         LayerTreeHost::didDestroyGLContext()
0:43 (renderLayerTree thread 1887123168) --                         ThreadedCompositor::invalidate() END
0:43 (     layerFlush thread 1887123168) -- LayerTreeHost::~LayerTreeHost -- delete m_coordinator
0:43 (     layerFlush thread 1887123168) -- CompositingCoordinator::~CompositingCoordinator()
0:43 (     layerFlush thread 1887123168) -- CompositingCoordinator::~CompositingCoordinator() -- registeredLayer->invalidateCoordinator()
0:43 (     layerFlush thread 1887123168) -- CompositingCoordinator::~CompositingCoordinator() -- registeredLayer->invalidateCoordinator()
CRASH!!!
```

[Pablo Saavedra]

Created attachment 454084 [details]
patch

[Pablo Saavedra]

Created attachment 454085 [details]
patch

[EWS]

Committed r291335 (248474@main): <https://commits.webkit.org/248474@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 454085 [details].

[Radar WebKit Bug Importer]

<rdar://problem/90360450>