The latest Linux ASan opt builds now include some UBSan checks. Reduced with m-c: BuildID=20180916213810 SourceStamp=5165e750ffabb930deb846410ab62dcc6d1f9e52 src/accessible/generic/ImageAccessible.cpp:66:9: runtime error: load of value 176, which is not a valid value for type 'bool' #0 0x7f8cbd022f82 in mozilla::a11y::ImageAccessible::NativeState() const src/accessible/generic/ImageAccessible.cpp:66:9 #1 0x7f8cbcfd2899 in mozilla::a11y::Accessible::State() src/accessible/generic/Accessible.cpp:1206:20 #2 0x7f8cbcff8929 in AccStateChangeEvent src/accessible/base/AccEvent.h:154:34 #3 0x7f8cbcff8929 in mozilla::a11y::DocAccessible::AttributeChangedImpl(mozilla::a11y::Accessible*, int, nsAtom*) src/accessible/generic/DocAccessible.cpp:948 #4 0x7f8cbcff693b in mozilla::a11y::DocAccessible::AttributeChanged(mozilla::dom::Element*, int, nsAtom*, int, nsAttrValue const*) src/accessible/generic/DocAccessible.cpp:805:3 #5 0x7f8cb3c21867 in nsNodeUtils::AttributeChanged(mozilla::dom::Element*, int, nsAtom*, int, nsAttrValue const*) src/dom/base/nsNodeUtils.cpp:170:3 #6 0x7f8cb3819b4c in mozilla::dom::Element::UnsetAttr(int, nsAtom*, bool) src/dom/base/Element.cpp:3052:5 #7 0x7f8cb381bc86 in mozilla::dom::Element::RemoveAttribute(nsTSubstring<char16_t> const&, mozilla::ErrorResult&) src/dom/base/Element.cpp:1413:12 #8 0x7f8cb61f0c6b in mozilla::dom::Element_Binding::removeAttribute(JSContext*, JS::Handle<JSObject*>, mozilla::dom::Element*, JSJitMethodCallArgs const&) src/obj-firefox/dom/bindings/ElementBinding.cpp:1378:9 #9 0x7f8cb6acff90 in bool mozilla::dom::binding_detail::GenericMethod<mozilla::dom::binding_detail::NormalThisPolicy, mozilla::dom::binding_detail::ThrowExceptions>(JSContext*, unsigned int, JS::Value*) src/dom/bindings/BindingUtils.cpp:3296:13 #10 0x7f8cbf93b16b in CallJSNative src/js/src/vm/Interpreter.cpp:460:15 #11 0x7f8cbf93b16b in js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct) src/js/src/vm/Interpreter.cpp:552 #12 0x7f8cbf923e46 in CallFromStack src/js/src/vm/Interpreter.cpp:612:12 #13 0x7f8cbf923e46 in Interpret(JSContext*, js::RunState&) src/js/src/vm/Interpreter.cpp:3439 #14 0x7f8cbf908a03 in js::RunScript(JSContext*, js::RunState&) src/js/src/vm/Interpreter.cpp:439:12 #15 0x7f8cbf93bc7e in js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct) src/js/src/vm/Interpreter.cpp:579:15 #16 0x7f8cbf93da12 in js::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>) src/js/src/vm/Interpreter.cpp:625:10 #17 0x7f8cbe9d744d in JS::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, JS::HandleValueArray const&, JS::MutableHandle<JS::Value>) src/js/src/jsapi.cpp:2959:12 #18 0x7f8cb608172a in mozilla::dom::EventHandlerNonNull::Call(JSContext*, JS::Handle<JS::Value>, mozilla::dom::Event&, JS::MutableHandle<JS::Value>, mozilla::ErrorResult&) src/obj-firefox/dom/bindings/EventHandlerBinding.cpp:264:37 #19 0x7f8cb736caba in void mozilla::dom::EventHandlerNonNull::Call<nsISupports*>(nsISupports* const&, mozilla::dom::Event&, JS::MutableHandle<JS::Value>, mozilla::ErrorResult&, char const*, mozilla::dom::CallbackObject::ExceptionHandling, JS::Realm*) src/obj-firefox/dist/include/mozilla/dom/EventHandlerBinding.h:363:12 #20 0x7f8cb7369f6e in mozilla::JSEventHandler::HandleEvent(mozilla::dom::Event*) src/dom/events/JSEventHandler.cpp:214:12 #21 0x7f8cb731d115 in mozilla::EventListenerManager::HandleEventSubType(mozilla::EventListenerManager::Listener*, mozilla::dom::Event*, mozilla::dom::EventTarget*) src/dom/events/EventListenerManager.cpp:1111:52 #22 0x7f8cb731f30c in mozilla::EventListenerManager::HandleEventInternal(nsPresContext*, mozilla::WidgetEvent*, mozilla::dom::Event**, mozilla::dom::EventTarget*, nsEventStatus*, bool) src/dom/events/EventListenerManager.cpp:1342:20 #23 0x7f8cb73031be in HandleEvent src/obj-firefox/dist/include/mozilla/EventListenerManager.h:390:5 #24 0x7f8cb73031be in mozilla::EventTargetChainItem::HandleEvent(mozilla::EventChainPostVisitor&, mozilla::ELMCreationDetector&) src/dom/events/EventDispatcher.cpp:420 #25 0x7f8cb73014e3 in mozilla::EventTargetChainItem::HandleEventTargetChain(nsTArray<mozilla::EventTargetChainItem>&, mozilla::EventChainPostVisitor&, mozilla::EventDispatchingCallback*, mozilla::ELMCreationDetector&) src/dom/events/EventDispatcher.cpp:637:16 #26 0x7f8cb7307db2 in mozilla::EventDispatcher::Dispatch(nsISupports*, nsPresContext*, mozilla::WidgetEvent*, mozilla::dom::Event*, nsEventStatus*, mozilla::EventDispatchingCallback*, nsTArray<mozilla::dom::EventTarget*>*) src/dom/events/EventDispatcher.cpp:1112:9 #27 0x7f8cb9f6d7c8 in nsDocumentViewer::LoadComplete(nsresult) src/layout/base/nsDocumentViewer.cpp:1167:7 #28 0x7f8cbcddb0e3 in nsDocShell::EndPageLoad(nsIWebProgress*, nsIChannel*, nsresult) src/docshell/base/nsDocShell.cpp:7088:21 #29 0x7f8cbcdd6157 in nsDocShell::OnStateChange(nsIWebProgress*, nsIRequest*, unsigned int, nsresult) src/docshell/base/nsDocShell.cpp:6881:7 #30 0x7f8cbcddf5a7 in non-virtual thunk to nsDocShell::OnStateChange(nsIWebProgress*, nsIRequest*, unsigned int, nsresult) src/docshell/base/nsDocShell.cpp #31 0x7f8cb2171b85 in nsDocLoader::DoFireOnStateChange(nsIWebProgress*, nsIRequest*, int&, nsresult) src/uriloader/base/nsDocLoader.cpp:1309:3 #32 0x7f8cb217076c in nsDocLoader::doStopDocumentLoad(nsIRequest*, nsresult) src/uriloader/base/nsDocLoader.cpp:852:14 #33 0x7f8cb216c259 in nsDocLoader::DocLoaderIsEmpty(bool) src/uriloader/base/nsDocLoader.cpp:741:9 #34 0x7f8cb216eb32 in nsDocLoader::OnStopRequest(nsIRequest*, nsISupports*, nsresult) src/uriloader/base/nsDocLoader.cpp:627:5 #35 0x7f8cb2170294 in non-virtual thunk to nsDocLoader::OnStopRequest(nsIRequest*, nsISupports*, nsresult) src/uriloader/base/nsDocLoader.cpp #36 0x7f8cafb43582 in mozilla::net::nsLoadGroup::RemoveRequest(nsIRequest*, nsISupports*, nsresult) src/netwerk/base/nsLoadGroup.cpp:629:28 #37 0x7f8cb33ec6e0 in imgRequestProxy::RemoveFromLoadGroup() src/image/imgRequestProxy.cpp:440:15 #38 0x7f8cb33f512f in imgRequestProxy::OnLoadComplete(bool) src/image/imgRequestProxy.cpp:1084:7 #39 0x7f8cb33e3adc in operator() src/image/ProgressTracker.cpp:358:13 #40 0x7f8cb33e3adc in void mozilla::image::ImageObserverNotifier<mozilla::image::ObserverTable const*>::operator()<void mozilla::image::SyncNotifyInternal<mozilla::image::ObserverTable const*>(mozilla::image::ObserverTable const* const&, bool, unsigned int, mozilla::gfx::IntRectTyped<mozilla::gfx::UnknownUnits> const&)::{lambda(mozilla::image::IProgressObserver*)#7}>(void mozilla::image::SyncNotifyInternal<mozilla::image::ObserverTable const*>(mozilla::image::ObserverTable const* const&, bool, unsigned int, mozilla::gfx::IntRectTyped<mozilla::gfx::UnknownUnits> const&)::{lambda(mozilla::image::IProgressObserver*)#7}) src/image/ProgressTracker.cpp:283 #41 0x7f8cb33e1386 in void mozilla::image::SyncNotifyInternal<mozilla::image::ObserverTable const*>(mozilla::image::ObserverTable const* const&, bool, unsigned int, mozilla::gfx::IntRectTyped<mozilla::gfx::UnknownUnits> const&) src/image/ProgressTracker.cpp:357:5 #42 0x7f8cb3332af1 in operator() src/image/ProgressTracker.cpp:378:5 #43 0x7f8cb3332af1 in Read<(lambda at src/image/ProgressTracker.cpp:377:19)> src/image/CopyOnWrite.h:179 #44 0x7f8cb3332af1 in mozilla::image::ProgressTracker::SyncNotifyProgress(unsigned int, mozilla::gfx::IntRectTyped<mozilla::gfx::UnknownUnits> const&) src/image/ProgressTracker.cpp:377 #45 0x7f8cb33408fc in mozilla::image::RasterImage::NotifyProgress(unsigned int, mozilla::gfx::IntRectTyped<mozilla::gfx::UnknownUnits> const&, mozilla::Maybe<unsigned int> const&, mozilla::image::DecoderFlags, mozilla::image::SurfaceFlags) src/image/RasterImage.cpp:1726:28 #46 0x7f8cb335a1de in NotifyForLoadEvent src/image/RasterImage.cpp:1001:3 #47 0x7f8cb335a1de in mozilla::image::RasterImage::NotifyDecodeComplete(mozilla::image::DecoderFinalStatus const&, mozilla::image::ImageMetadata const&, mozilla::image::DecoderTelemetry const&, unsigned int, mozilla::gfx::IntRectTyped<mozilla::gfx::UnknownUnits> const&, mozilla::Maybe<unsigned int> const&, mozilla::image::DecoderFlags, mozilla::image::SurfaceFlags) src/image/RasterImage.cpp:1808 #48 0x7f8cb332b564 in operator() src/image/IDecodingTask.cpp:130:12 #49 0x7f8cb332b564 in mozilla::detail::RunnableFunction<mozilla::image::IDecodingTask::NotifyDecodeComplete(mozilla::NotNull<mozilla::image::RasterImage*>, mozilla::NotNull<mozilla::image::Decoder*>)::$_2>::Run() src/xpcom/threads/nsThreadUtils.h:564 #50 0x7f8caf8bfd08 in nsThread::ProcessNextEvent(bool, bool*) src/xpcom/threads/nsThread.cpp:1161:14 #51 0x7f8caf8c8955 in NS_ProcessNextEvent(nsIThread*, bool) src/xpcom/threads/nsThreadUtils.cpp:519:10 #52 0x7f8cb0adead3 in mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) src/ipc/glue/MessagePump.cpp:97:21 #53 0x7f8cb09de3ec in RunInternal src/ipc/chromium/src/base/message_loop.cc:325:10 #54 0x7f8cb09de3ec in RunHandler src/ipc/chromium/src/base/message_loop.cc:318 #55 0x7f8cb09de3ec in MessageLoop::Run() src/ipc/chromium/src/base/message_loop.cc:298 #56 0x7f8cb96ee5a3 in nsBaseAppShell::Run() src/widget/nsBaseAppShell.cpp:158:27 #57 0x7f8cbdb874fe in XRE_RunAppShell() src/toolkit/xre/nsEmbedFunctions.cpp:944:22 #58 0x7f8cb09de3ec in RunInternal src/ipc/chromium/src/base/message_loop.cc:325:10 #59 0x7f8cb09de3ec in RunHandler src/ipc/chromium/src/base/message_loop.cc:318 #60 0x7f8cb09de3ec in MessageLoop::Run() src/ipc/chromium/src/base/message_loop.cc:298 #61 0x7f8cbdb86623 in XRE_InitChildProcess(int, char**, XREChildData const*) src/toolkit/xre/nsEmbedFunctions.cpp:770:34 #62 0x55d3b249db91 in content_process_main src/browser/app/../../ipc/contentproc/plugin-container.cpp:50:30 #63 0x55d3b249db91 in main src/browser/app/nsBrowserApp.cpp:287 #64 0x7f8cd1e8082f in __libc_start_main /build/glibc-Cl5G7W/glibc-2.23/csu/../csu/libc-start.c:291 #65 0x55d3b23ccf3c in _start (firefox+0x2cf3c)

it should fix the bug, there are implementations that don't always initialize output value https://dxr.mozilla.org/mozilla-central/search?q=%2Boverrides%3A%22imgIContainer%3A%3AGetAnimated%28bool+%2A%29%22

Pushed by surkov.alexander@gmail.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/7be2a431c9cb UBSan: load of value which is not a valid value for type 'bool' in ImageAccessible.cpp, r=jamie