308849 2026-02-27 14:08:04 -0800 REGRESSION(307744@main): [iOS debug] css3/filters/effect-drop-shadow.html is a constant crash 2026-03-02 16:23:44 -0800 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 d_delatoba simon.fraser bfulgham jbedard simon.fraser webkit-bot-watchers-bugzilla webkit-bug-importer zalan oldest_to_newest 2185661 0 d_delatoba 2026-02-27 14:08:04 -0800 css3/filters/effect-drop-shadow.html is a constant crash on iOS debug. HISTORY: https://results.webkit.org/?suite=layout-tests&test=css3%2Ffilters%2Feffect-drop-shadow.html CRASH LOG: No crash log found for WebKitTestRunnerApp:30805. stdout: layer at (0,0) size 800x600 RenderView at (0,0) size 800x600 layer at (0,0) size 800x245 RenderBlock {HTML} at (0,0) size 800x245 RenderBody {BODY} at (8,8) size 784x229 RenderText {#text} at (0,0) size 0x0 layer at (18,18) size 160x90 RenderImage {IMG} at (10,10) size 160x90 layer at (198,18) size 160x90 RenderImage {IMG} at (190,10) size 160x90 layer at (378,18) size 160x90 RenderImage {IMG} at (370,10) size 160x90 layer at (558,18) size 160x90 RenderImage {IMG} at (550,10) size 160x90 layer at (18,133) size 160x90 RenderImage {IMG} at (10,124) size 160x91 stderr: SHOULD NEVER BE REACHED /Volumes/Data/worker/Apple-iOS-26-Simulator-Debug-Build/build/Source/WebKit/WebProcess/WebPage/ios/WebPageIOS.mm(3784) : void WebKit::WebPage::updateVisibleContentRects(const VisibleContentRectUpdateInfo &, MonotonicTime) 1 0x132fe4fe4 WebKit::WebPage::updateVisibleContentRects(WebKit::VisibleContentRectUpdateInfo const&, WTF::MonotonicTime) 2 0x13437edcc WebKit::ViewUpdateDispatcher::dispatchVisibleContentRectUpdate() 3 0x134394568 WebKit::ViewUpdateDispatcher::visibleContentRectUpdate(WTF::ObjectIdentifierGeneric<WebCore::PageIdentifierType, WTF::ObjectIdentifierMainThreadAccessTraits<unsigned long long>, unsigned long long>, WebKit::VisibleContentRectUpdateInfo const&)::$_0::operator()() const 4 0x134394330 WTF::Detail::CallableWrapper<WebKit::ViewUpdateDispatcher::visibleContentRectUpdate(WTF::ObjectIdentifierGeneric<WebCore::PageIdentifierType, WTF::ObjectIdentifierMainThreadAccessTraits<unsigned long long>, unsigned long long>, WebKit::VisibleContentRectUpdateInfo const&)::$_0, void>::call() 5 0x1057a385c WTF::Function<void ()>::operator()() const 6 0x1058817b0 WTF::RunLoop::performWork() 7 0x105889394 WTF::RunLoop::performWork(void*) 8 0x1804563a4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ 9 0x1804562ec __CFRunLoopDoSource0 10 0x180455a78 __CFRunLoopDoSources0 11 0x180454c4c __CFRunLoopRun 12 0x18044fcec _CFRunLoopRunSpecificWithOptions 13 0x18110be48 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] 14 0x18110c018 -[NSRunLoop(NSRunLoop) run] 15 0x18011282c _xpc_objc_main 16 0x180114c38 _xpc_main 17 0x180114dec _xpc_create_bootstrap_pipe 18 0x1d4bdcaf4 $s19ExtensionFoundation023_EXRunningLibXPCServiceA0C6resumeyyF 19 0x1d4b701e0 $s19ExtensionFoundation010_EXRunningA0C5start13withArguments5counts5Int32VSpySPys4Int8VGGSg_AHtF 20 0x1d4b683d4 $s19ExtensionFoundation15EXExtensionMainyS2i_SpySPys4Int8VGGSgtF 21 0x181151070 NSExtensionMain 22 0x1026ed3d0 21 dyld 0x00000001026ed3d0 start_sim + 20 23 0x10285cd54 22 ??? 0x000000010285cd54 0x0 + 4337290580 com.apple.WebKit.WebContent.Development terminated (pid 30810) for reason: crash #CRASHED - com.apple.WebKit.WebContent.Development (pid 30810) REPRODUCTION: I was able to reproduce on iOS 26.2 debug ToT with the following: run-webkit-tests --ios-simulator --debug --child-processes=1 --no-retry css3/filters/effect-drop-shadow.html 2185663 1 webkit-bug-importer 2026-02-27 14:08:10 -0800 <rdar://problem/171385160> 2185664 2 d_delatoba 2026-02-27 14:12:41 -0800 Pull request: https://github.com/WebKit/WebKit/pull/59610 2185665 3 ews-feeder 2026-02-27 14:14:45 -0800 Test gardening commit 308367@main (8630c822fcda): <https://commits.webkit.org/308367@main> Reviewed commits have been landed. Closing PR #59610 and removing active labels. 2186130 4 jbedard 2026-03-02 08:05:38 -0800 Impacts more than just one test, I expect. compositing/geometry/fixed-position-composited-page-scale-smaller-than-viewport.html, for example, seems to have a similar assertion: https://results.webkit.org/?suite=layout-tests&test=compositing%2Fgeometry%2Ffixed-position-composited-page-scale-smaller-than-viewport.html 2186179 5 simon.fraser 2026-03-02 10:21:27 -0800 Pull request: https://github.com/WebKit/WebKit/pull/59723 2186302 6 ews-feeder 2026-03-02 16:23:42 -0800 Committed 308491@main (a395421472e8): <https://commits.webkit.org/308491@main> Reviewed commits have been landed. Closing PR #59723 and removing active labels.