314269 2026-05-06 18:07:11 -0700 [GTK][WPE] ASSERTION FAILED: m_wrapper in OffscreenCanvas::dispatchEvent for webgl/lose-context-after-context-lost.html 2026-05-17 19:38:03 -0700 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED DoNotImportToRadar P2 Normal --- 1 fujii fujii bugs-noreply oldest_to_newest 2208392 0 fujii 2026-05-06 18:07:11 -0700 [GTK][WPE] ASSERTION FAILED: m_wrapper in OffscreenCanvas::dispatchEvent for webgl/lose-context-after-context-lost.html History: https://results.webkit.org/?suite=layout-tests&test=webgl%2Flose-context-after-context-lost.html&platform=GTK&platform=WPE https://build.webkit.org/results/GTK-Linux-64-bit-Debug-Tests/312703@main%20(18895)/webgl/lose-context-after-context-lost-stderr.txt ASSERTION FAILED: m_wrapper ../../../Source/WebCore/bindings/js/JSEventListener.h(171) : JSC::JSObject* WebCore::JSEventListener::ensureJSFunction(WebCore::ScriptExecutionContext&) const 1 0x7f5fac39ba57 WebCore::JSEventListener::ensureJSFunction(WebCore::ScriptExecutionContext&) const 2 0x7f5fac39d673 WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) 3 0x7f5fad5b3cec WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::Ref<WebCore::RegisteredEventListener, WTF::RawPtrTraits<WebCore::RegisteredEventListener>, WTF::DefaultRefDerefTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 2ul, WTF::FastMalloc>, WebCore::EventTarget::EventInvokePhase) 4 0x7f5fad5b369e WebCore::EventTarget::fireEventListeners(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) 5 0x7f5fad59ceea WebCore::EventContext::handleLocalEvents(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) const 6 0x7f5fad59d7fc dispatchEventInDOM 7 0x7f5fad5a1403 dispatchEventWithType<WebCore::EventTarget> 8 0x7f5fad59eaa0 WebCore::EventDispatcher::dispatchEvent(std::span<WebCore::EventTarget* const, 18446744073709551615ul>, WebCore::Event&) 9 0x7f5fade1941d WebCore::OffscreenCanvas::dispatchEvent(WebCore::Event&) 10 0x7f5fadf4a8bc operator()<WebCore::CanvasBase> 11 0x7f5fadf4a9ea call 12 0x7f5fadcf734c WTF::Function<void (WebCore::CanvasBase&)>::operator()(WebCore::CanvasBase&) const 13 0x7f5fade1d035 operator()<WebCore::OffscreenCanvas> 14 0x7f5fade1d064 operator() 15 0x7f5fade22cf2 call 16 0x7f5fa50407ee WTF::Function<void ()>::operator()() const 17 0x7f5fad5ab9b2 WebCore::EventLoopFunctionDispatchTask::execute() 18 0x7f5fad5aa527 WebCore::EventLoop::run(JSC::VM&, std::optional<WTF::ApproximateTime>) 19 0x7f5fad9797b0 WebCore::WindowEventLoop::didReachTimeToRun() 20 0x7f5fad97fa92 WebCore::Timer::Timer<WebCore::WindowEventLoop, WebCore::WindowEventLoop>(WebCore::WindowEventLoop&, void (WebCore::WindowEventLoop::*)())::{lambda()#1}::operator()() const 21 0x7f5fad993d16 WTF::Detail::CallableWrapper<WebCore::Timer::Timer<WebCore::WindowEventLoop, WebCore::WindowEventLoop>(WebCore::WindowEventLoop&, void (WebCore::WindowEventLoop::*)())::{lambda()#1}, void>::call() 22 0x7f5fa50407ee WTF::Function<void ()>::operator()() const 23 0x7f5fa685978a WebCore::Timer::fired() 24 0x7f5faecc6039 WebCore::ThreadTimers::sharedTimerFiredInternal() 25 0x7f5faecc5831 operator() 26 0x7f5faecd859c call 27 0x7f5fa50407ee WTF::Function<void ()>::operator()() const 28 0x7f5faebdd48b WebCore::MainThreadSharedTimer::fired() 29 0x7f5faebdee0c WTF::RunLoop::Timer::Timer<WebCore::MainThreadSharedTimer>(WTF::Ref<WTF::RunLoop, WTF::RawPtrTraits<WTF::RunLoop>, WTF::DefaultRefDerefTraits<WTF::RunLoop> >&&, WTF::ASCIILiteral, WebCore::MainThreadSharedTimer*, void (WebCore::MainThreadSharedTimer::*)())::{lambda()#1}::operator()() const 30 0x7f5faebe4808 WTF::Detail::CallableWrapper<WTF::RunLoop::Timer::Timer<WebCore::MainThreadSharedTimer>(WTF::Ref<WTF::RunLoop, WTF::RawPtrTraits<WTF::RunLoop>, WTF::DefaultRefDerefTraits<WTF::RunLoop> >&&, WTF::ASCIILiteral, WebCore::MainThreadSharedTimer*, void (WebCore::MainThreadSharedTimer::*)())::{lambda()#1}, void>::call() 31 0x7f5fa50407ee WTF::Function<void ()>::operator()() const WebKitWebProcess terminated (pid 4034991) for reason: crash 2210805 1 fujii 2026-05-14 00:46:42 -0700 This is reproducible on my PC. > ./Tools/Scripts/run-webkit-tests --gtk --release --no-retry --force --iter=1000 --exit-after-n-crash=1 --no-timeout -f --child=10 webgl/lose-context-after-context-lost.html 2210807 2 fujii 2026-05-14 00:48:16 -0700 I'm using GTK release build with ENABLE_ASSERTS=1 of 313226@main. 2210819 3 fujii 2026-05-14 01:08:05 -0700 This is the backtrace on my PC. webglcontextlost event is dispatched. Thread 1 (Thread 0x7f14345e8f00 (LWP 323507)): #0 0x00007f1441924319 in WTFCrash () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libjavascriptcoregtk-6.0.so.1 #1 0x00007f1447507e88 in WTFCrashWithInfo(int, char const*, char const*) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #2 0x00007f144a4f7949 in WebCore::JSEventListener::ensureJSFunction(WebCore::ScriptExecutionContext&) const () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #3 0x00007f144a4f6666 in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #4 0x00007f144aad2498 in WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::Ref<WebCore::RegisteredEventListener, WTF::RawPtrTraits<WebCore::RegisteredEventListener>, WTF::DefaultRefDerefTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 2ul, WTF::FastMalloc>, WebCore::EventTarget::EventInvokePhase) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #5 0x00007f144aad1d13 in WebCore::EventTarget::fireEventListeners(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #6 0x00007f144aabdfc9 in WebCore::EventContext::handleLocalEvents(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) const () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #7 0x00007f144aac0e61 in WebCore::dispatchEventInDOM(WebCore::Event&, WebCore::EventPath const&, WebCore::Document::EventListenerCounts const&) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #8 0x00007f144aac1255 in WebCore::EventDispatcher::dispatchEvent(std::span<WebCore::EventTarget* const, 18446744073709551615ul>, WebCore::Event&) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #9 0x00007f144b0caea1 in non-virtual thunk to WebCore::OffscreenCanvas::dispatchEvent(WebCore::Event&) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #10 0x00007f144b18a499 in WTF::Detail::CallableWrapper<WebCore::WebGLRenderingContextBase::scheduleTaskToDispatchContextLostEvent()::$_0, void, WebCore::CanvasBase&>::call(WebCore::CanvasBase&) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #11 0x00007f144aac75c4 in WebCore::EventLoop::run(JSC::VM&, std::optional<WTF::ApproximateTime>) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #12 0x00007f144acffcc5 in WebCore::WindowEventLoop::didReachTimeToRun() () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #13 0x00007f144ad05e7e in WebCore::Timer::Timer<WebCore::WindowEventLoop, WebCore::WindowEventLoop>(WebCore::WindowEventLoop&, void (WebCore::WindowEventLoop::*)()) requires (WTF::HasRefPtrMemberFunctions<WebCore::WindowEventLoop>::value&&(!WTF::HasThreadSafeWeakPtrFunctions<WebCore::WindowEventLoop>::value))&&WTF::HasWeakPtrFunctions<WebCore::WindowEventLoop>::value::{lambda()#1}::operator()() const () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #14 0x00007f144b9bad32 in WebCore::ThreadTimers::sharedTimerFiredInternal() () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #15 0x00007f1441a5e842 in WTF::RunLoop::TimerBase::TimerBase(WTF::Ref<WTF::RunLoop, WTF::RawPtrTraits<WTF::RunLoop>, WTF::DefaultRefDerefTraits<WTF::RunLoop> >&&, WTF::ASCIILiteral)::$_0::__invoke(void*) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libjavascriptcoregtk-6.0.so.1 #16 0x00007f1441a5c5d9 in WTF::RunLoop::$_3::__invoke(_GSource*, int (*)(void*), void*) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libjavascriptcoregtk-6.0.so.1 #17 0x00007f1441d0ef7f in g_main_dispatch (context=context@entry=0x5618ab9f5c10) at ../../../../../jhbuild/checkout/glib/glib/gmain.c:3357 #18 0x00007f1441d116f8 in g_main_context_dispatch_unlocked (context=0x5618ab9f5c10) at ../../../../../jhbuild/checkout/glib/glib/gmain.c:4208 #19 g_main_context_dispatch (context=0x5618ab9f5c10) at ../../../../../jhbuild/checkout/glib/glib/gmain.c:4196 #20 0x00007f1441a5cd29 in WTF::RunLoop::runGLibMainLoopIteration(WTF::RunLoop::MayBlock) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libjavascriptcoregtk-6.0.so.1 #21 0x00007f1441a5d0d7 in WTF::RunLoop::run() () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libjavascriptcoregtk-6.0.so.1 #22 0x00007f14487a8273 in WebKit::WebProcessMain(int, char**) () from /sdk/webkit/WebKitBuild/GTK/Release/lib/libwebkitgtk-6.0.so.4 #23 0x00007f143be701ca in __libc_start_call_main (main=main@entry=0x5618ab699990 <main>, argc=argc@entry=4, argv=argv@entry=0x7ffd3fabb568) at ../sysdeps/nptl/libc_start_call_main.h:58 #24 0x00007f143be7028b in __libc_start_main_impl (main=0x5618ab699990 <main>, argc=4, argv=0x7ffd3fabb568, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd3fabb558) at ../csu/libc-start.c:360 #25 0x00005618ab6998c5 in _start () 2210843 4 fujii 2026-05-14 02:45:38 -0700 Pull request: https://github.com/WebKit/WebKit/pull/64921 2211597 5 ews-feeder 2026-05-17 19:38:00 -0700 Committed 313384@main (2be1403ca6cd): <https://commits.webkit.org/313384@main> Reviewed commits have been landed. Closing PR #64921 and removing active labels.