149281 2015-09-17 13:00:35 -0700 Regression(r189881): release assertion hit in toJS(ExecState*, JSDOMGlobalObject*, DocumentFragment*) 2015-09-17 17:46:32 -0700 1 1 1 Unclassified WebKit DOM Other Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 cdumez cdumez ap commit-queue darin ggaren rniwa oldest_to_newest 1126795 0 cdumez 2015-09-17 13:00:35 -0700 release assertion hit in toJS(ExecState*, JSDOMGlobalObject*, DocumentFragment*) after <http://trac.webkit.org/changeset/189881>: Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00000000bbadbeef VM Regions Near 0xbbadbeef: --> __TEXT 0000000100d8f000-0000000100d91000 [ 8K] r-x/rwx SM=COW /Volumes/VOLUME/*/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.Development.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development Application Specific Information: CRASHING TEST: plugins/snapshotting/snapshot-plugin-not-quite-blocked-by-image.html Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.JavaScriptCore 0x0000000106917d1e WTFCrash + 62 1 com.apple.WebCore 0x0000000107826155 WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::DocumentFragment*) + 149 2 com.apple.WebCore 0x00000001072cf527 WebCore::HTMLPlugInImageElement::didAddUserAgentShadowRoot(WebCore::ShadowRoot*) + 391 3 com.apple.WebCore 0x0000000107599f9e WebCore::Element::addShadowRoot(WTF::Ref<WebCore::ShadowRoot>&&) + 558 4 com.apple.WebCore 0x0000000107139a43 WebCore::Element::ensureUserAgentShadowRoot() + 83 5 com.apple.WebCore 0x000000010705f50d WebCore::ThreadTimers::sharedTimerFiredInternal() + 157 6 com.apple.WebCore 0x000000010705f438 WebCore::timerFired(__CFRunLoopTimer*, void*) + 24 1126796 1 cdumez 2015-09-17 13:02:46 -0700 The assertion is: // If you hit this assertion you either have a use after free bug, or // DocumentFragment has subclasses. If DocumentFragment has subclasses that get passed // to toJS() we currently require DocumentFragment you to opt out of binding hardening // by adding the SkipVTableValidation attribute to the interface IDL definition RELEASE_ASSERT(actualVTablePointer == expectedVTablePointer); DocumentFragment does have a subclass: ShadowRoot. However, ShadowRoot does not have a Web-Exposed type. Therefore, I believe the current code is safe and we should bypass the assertion here. 1126827 2 rniwa 2015-09-17 14:04:42 -0700 ShadowRoot will be exposed to Web now. 1126832 3 261420 cdumez 2015-09-17 14:10:34 -0700 Created attachment 261420 Patch 1126902 4 261443 cdumez 2015-09-17 15:38:39 -0700 Created attachment 261443 Patch 1126965 5 261443 commit-queue 2015-09-17 17:46:28 -0700 Comment on attachment 261443 Patch Clearing flags on attachment: 261443 Committed r189949: <http://trac.webkit.org/changeset/189949> 1126966 6 commit-queue 2015-09-17 17:46:32 -0700 All reviewed patches have been landed. Closing bug. 261420 2015-09-17 14:10:34 -0700 2015-09-17 15:07:07 -0700 Patch bug-149281-20150917141021.patch text/plain 2149 cdumez U3VidmVyc2lvbiBSZXZpc2lvbjogMTg5OTE4CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZmU4OTc2ZjRiMzMxNzkw ZWI2NDdmMjE5MTM2MTM0ZDEzYzE2MGM0Yi4uMDAyMjYyM2I2ODc1NzUxNThlNjVmNmQ0OWQ0OGY5 ODVjZGYyYjZlMSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI4IEBACisyMDE1LTA5LTE3ICBDaHJp cyBEdW1leiAgPGNkdW1lekBhcHBsZS5jb20+CisKKyAgICAgICAgUmVncmVzc2lvbihyMTg5ODgx KTogcmVsZWFzZSBhc3NlcnRpb24gaGl0IGluIHRvSlMoRXhlY1N0YXRlKiwgSlNET01HbG9iYWxP YmplY3QqLCBEb2N1bWVudEZyYWdtZW50KikKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5v cmcvc2hvd19idWcuY2dpP2lkPTE0OTI4MQorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAo T09QUyEpLgorCisgICAgICAgIEFmdGVyIHIxODk4ODEsIHdlIHN0YXJ0ZWQgZ2VuZXJhdGluZyBh IHRvSlMoKSBmdW5jdGlvbiBmb3IgRG9jdW1lbnRGcmFnbWVudAorICAgICAgICBhcyBhbiBvcHRp 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