Bug 83377

If the TextTrack mode is set from JavaScript, the tab crashes. For example: http://www.annacavender.com/track/demo1/track-setmode.html Crash log: ASSERTION FAILED: cue->isActive() <snip>WebKit/Source/WebCore/WebCore.gyp/../html/shadow/MediaControlElements.cpp(1284) : void WebCore::MediaControlTextTrackContainerElement::updateDisplay() 1 0x1d240aa8 WebCore::MediaControlTextTrackContainerElement::updateDisplay() 2 0x1d25046c WebCore::MediaControlRootElementChromium::updateTextTrackDisplay() 3 0x1d0cf731 WebCore::HTMLMediaElement::updateActiveTextTrackCues(float) 4 0x1d0c9bbf WebCore::HTMLMediaElement::playbackProgressTimerFired(WebCore::Timer<WebCore::HTMLMediaElement>*) 5 0x1d0f2647 WebCore::Timer<WebCore::HTMLMediaElement>::fired() 6 0x1d2cfdee WebCore::ThreadTimers::sharedTimerFiredInternal() 7 0x1d2cfb7f WebCore::ThreadTimers::sharedTimerFired() 8 0x1ec16ba9 webkit_glue::WebKitPlatformSupportImpl::DoTimeout() 9 0x1ec17fd4 base::internal::RunnableAdapter<void (webkit_glue::WebKitPlatformSupportImpl::*)()>::Run(webkit_glue::WebKitPlatformSupportImpl*) 10 0x1ec17ed3 base::internal::InvokeHelper<false, void, base::internal::RunnableAdapter<void (webkit_glue::WebKitPlatformSupportImpl::*)()>, void ()(webkit_glue::WebKitPlatformSupportImpl*)>::MakeItSo(base::internal::RunnableAdapter<void (webkit_glue::WebKitPlatformSupportImpl::*)()>, webkit_glue::WebKitPlatformSupportImpl*) 11 0x1ec17e13 base::internal::Invoker<1, base::internal::BindState<base::internal::RunnableAdapter<void (webkit_glue::WebKitPlatformSupportImpl::*)()>, void ()(webkit_glue::WebKitPlatformSupportImpl*), void ()(base::internal::UnretainedWrapper<webkit_glue::WebKitPlatformSupportImpl>)>, void ()(webkit_glue::WebKitPlatformSupportImpl*)>::Run(base::internal::BindStateBase*) 12 0x1a59e6bb base::Callback<void ()()>::Run() const 13 0x1ad05b5b base::Timer::RunScheduledTask() 14 0x1ad05d69 base::BaseTimerTaskInternal::Run() 15 0x1ad06634 base::internal::RunnableAdapter<void (base::BaseTimerTaskInternal::*)()>::Run(base::BaseTimerTaskInternal*) 16 0x1ad06533 base::internal::InvokeHelper<false, void, base::internal::RunnableAdapter<void (base::BaseTimerTaskInternal::*)()>, void ()(base::BaseTimerTaskInternal*)>::MakeItSo(base::internal::RunnableAdapter<void (base::BaseTimerTaskInternal::*)()>, base::BaseTimerTaskInternal*) 17 0x1ad0646e base::internal::Invoker<1, base::internal::BindState<base::internal::RunnableAdapter<void (base::BaseTimerTaskInternal::*)()>, void ()(base::BaseTimerTaskInternal*), void ()(base::internal::OwnedWrapper<base::BaseTimerTaskInternal>)>, void ()(base::BaseTimerTaskInternal*)>::Run(base::internal::BindStateBase*) 18 0x1a59e6bb base::Callback<void ()()>::Run() const 19 0x1ac4744e MessageLoop::RunTask(base::PendingTask const&) 20 0x1ac477f1 MessageLoop::DeferOrRunPendingTask(base::PendingTask const&) 21 0x1ac47d83 MessageLoop::DoDelayedWork(base::TimeTicks*) 22 0x1abb17c8 base::MessagePumpCFRunLoopBase::RunWork() 23 0x1abb0e92 base::MessagePumpCFRunLoopBase::RunWorkSource(void*) 24 0x9951b42b __CFRunLoopDoSources0 25 0x99518eef __CFRunLoopRun 26 0x995183c4 CFRunLoopRunSpecific 27 0x995181f1 CFRunLoopRunInMode 28 0x961671b3 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] 29 0x1abb21f9 base::MessagePumpNSRunLoop::DoRun(base::MessagePump::Delegate*) 30 0x1abb148d base::MessagePumpCFRunLoopBase::Run(base::MessagePump::Delegate*) 31 0x1ac46db3 MessageLoop::RunInternal() Program received signal: “EXC_BAD_ACCESS”. [Switching to process 44366] [Switching to process 44366] sharedlibrary apply-load-rules all (gdb)