Bug 204848

When WebKit has somehow gotten itself into the "bad state" described in bug #201507, webpages that use GStreamerGL crash instead of falling back to non-AC mode. Once the mysterious bad state is achieved, it becomes 100% reproducible by loading https://riot.igalia.com. Program terminated with signal SIGSEGV, Segmentation fault. #0 WebCore::MediaPlayerPrivateGStreamer::ensureGstGLContext ( this=0x7f8c214d5700) at ../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:1916 1916 GstGLPlatform glPlatform = webkitContext->isEGLContext() ? GST_GL_PLATFORM_EGL : GST_GL_PLATFORM_GLX; (gdb) bt full #0 0x00007f8ca4020e5a in WebCore::MediaPlayerPrivateGStreamer::ensureGstGLContext() (this=0x7f8c214d5700) at ../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:1916 sharedDisplay = <optimized out> shouldAdoptRef = true webkitContext = 0x0 glPlatform = <optimized out> glAPI = <optimized out> contextHandle = <optimized out> previousActiveContext = <optimized out> #1 0x00007f8ca4020e5a in WebCore::MediaPlayerPrivateGStreamer::ensureGstGLContext() (this=0x7f8c214d5700) at ../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:1861 #2 0x00007f8ca40213f9 in WebCore::MediaPlayerPrivateGStreamer::requestGLContext(char const*) (this=0x7f8c214d5700, contextType=0x7f8ca42e2725 "gst.gl.GLDisplay") at ../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:1838 #3 0x00007f8ca402382c in WebCore::MediaPlayerPrivateGStreamer::ensureGLVideoSinkContext() (this=this@entry=0x7f8c214d5700) at ../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:3700 #4 0x00007f8ca4023af8 in WebCore::MediaPlayerPrivateGStreamer::changePipelineState(GstState) (this=0x7f8c214d5700, newState=GST_STATE_PAUSED) at ../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:1187 currentState = GST_STATE_NULL pending = GST_STATE_VOID_PENDING __FUNCTION__ = "changePipelineState" setStateResult = <optimized out> pausedOrPlaying = <optimized out> #5 0x00007f8ca401eff5 in WebCore::MediaPlayerPrivateGStreamer::commitLoad() (this=0x7f8c214d5700) at ../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:591 __FUNCTION__ = "commitLoad" #6 0x00007f8ca402f498 in WebCore::MediaPlayerPrivateGStreamer::loadFull(WTF::String const&, WTF::String const&) (this=0x7f8c214d5700, urlString=..., pipelineName=...) at ../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:550 url = {m_string = {static MaxLength = 2147483647, m_impl = {static isRefPtr = <error reading variable: Missing ELF symbol "WTF::RefPtr<WTF::StringImpl, WTF::DumbPtrTraits<WTF::StringImpl> >::isRefPtr".>, m_ptr = 0x7f8c318f96f0}}, m_isValid = 1, m_protocolIsInHTTPFamily = 1, m_cannotBeABaseURL = 0, m_portLength = 0, static maxPortLength = 7, static maxSchemeLength = 67108863, m_schemeEnd = 5, m_userStart = 8, m_userEnd = 8, m_passwordEnd = 8, m_hostEnd = 23, m_pathAfterLastSlash = 30, m_pathEnd = 41, m_queryEnd = 41} __FUNCTION__ = "loadFull" #7 0x00007f8ca402f588 in WebCore::MediaPlayerPrivateGStreamer::load(WTF::String const&) (this=<optimized out>, urlString=...) at DerivedSources/ForwardingHeaders/wtf/RefPtr.h:56 #8 0x00007f8ca39d5033 in WebCore::MediaPlayer::loadWithNextMediaEngine(WebCore::MediaPlayerFactory const*) (this=this@entry=0x7f8c31721398, current=current@entry=0x0) at DerivedSources/ForwardingHeaders/wtf/URL.h:94 engine = <optimized out> #9 0x00007f8ca39d533e in WebCore::MediaPlayer::load(WTF::URL const&, WebCore::ContentType const&, WTF::String const&) (this=0x7f8c31721398, url=..., contentType=..., keySystem=...) at ../Source/WebCore/platform/graphics/MediaPlayer.cpp:410 protectedThis = {static isRef = <error reading variable: Missing ELF symbol "WTF::Ref<WebCore::MediaPlayer, WTF::DumbPtrTraits<WebCore::MediaPlayer> >::isRef".>, m_ptr = 0x7f8c31721398} #10 0x00007f8ca3530a22 in WebCore::HTMLMediaElement::loadResource(WTF::URL const&, WebCore::ContentType&, WTF::String const&) (this=this@entry=0x7f8c4a82f390, initialURL=..., contentType=..., keySystem=...) at ../Source/WebCore/html/HTMLMediaElement.cpp:1618 frame = {static isRefPtr = <error reading variable: Missing ELF symbol "WTF::RefPtr<WebCore::Frame, WTF::DumbPtrTraits<WebCore::Frame> >::isRefPtr".>, m_ptr = 0x7f8c9ad87000} page = <optimized out> url = {m_string = {static MaxLength = 2147483647, m_impl = {static isRefPtr = <error reading variable: Missing ELF symbol "WTF::RefPtr<WTF::StringImpl, WTF::DumbPtrTraits<WTF::StringImpl> >::isRefPtr".>, m_ptr = 0x7f8c318f96f0}}, m_isValid = 1, m_protocolIsInHTTPFamily = 1, m_cannotBeABaseURL = 0, m_portLength = 0, static maxPortLength = 7, static maxSchemeLength = 67108863, m_schemeEnd = 5, m_userStart = 8, m_userEnd = 8, m_passwordEnd = 8, m_hostEnd = 23, m_pathAfterLastSlash = 30, m_pathEnd = 41, m_queryEnd = 41} resource = 0x0 loadAttempted = false #11 0x00007f8ca3531325 in WebCore::HTMLMediaElement::loadNextSourceChild() (this=0x7f8c4a82f390) at ../Source/WebCore/html/HTMLMediaElement.cpp:1499 contentType = {m_type = {static MaxLength = 2147483647, m_impl = {static isRefPtr = <error reading variable: Missing ELF symbol "WTF::RefPtr<WTF::StringImpl, WTF::DumbPtrTraits<WTF::StringImpl> >::isRefPtr".>, m_ptr = 0x7f8c495cf2c0}}} keySystem = {static MaxLength = 2147483647, m_impl = {static isRefPtr = <error reading variable: Missing ELF symbol "WTF::RefPtr<WTF::StringImpl, WTF::DumbPtrTraits<WTF::StringImpl> >::isRefPtr".>, m_ptr = 0x0}} mediaURL = {m_string = {static MaxLength = 2147483647, m_impl = {static isRefPtr = <error reading variable: Missing ELF symbol "WTF::RefPtr<WTF::StringImpl, WTF::DumbPtrTraits<WTF::StringImpl> >::isRefPtr".>, m_ptr = 0x7f8c318f96f0}}, m_isValid = 1, m_protocolIsInHTTPFamily = 1, m_cannotBeABaseURL = 0, m_portLength = 0, static maxPortLength = 7, static maxSchemeLength = 67108863, m_schemeEnd = 5, m_userStart = 8, m_userEnd = 8, m_passwordEnd = 8, m_hostEnd = 23, m_pathAfterLastSlash = 30, m_pathEnd = 41, m_queryEnd = 41} #12 0x00007f8ca3531715 in WebCore::HTMLMediaElement::<lambda()>::operator() (__closure=<optimized out>) at ../Source/WebCore/html/HTMLMediaElement.cpp:1481 mode = WebCore::HTMLMediaElement::<lambda()>::Children #13 0x00007f8ca3531715 in WTF::Detail::CallableWrapper<WebCore::HTMLMediaElement::selectMediaResource()::<lambda()>, void>::call(void) (this=0x7f8c214ccf78) at DerivedSources/ForwardingHeaders/wtf/Function.h:52 #14 0x00007f8ca3922b4d in WTF::Function<void ()>::operator()() const (this=<synthetic pointer>) at DerivedSources/ForwardingHeaders/wtf/Function.h:76 task = {m_callableWrapper = std::unique_ptr<WTF::Detail::CallableWrapperBase<void>> = {get() = 0x7f8c214ccf90}} #15 0x00007f8ca3922b4d in WebCore::TaskDispatcher<WebCore::Timer>::dispatchOneTask() (this=0x7f8c4a82f798) at ../Source/WebCore/platform/GenericTaskQueue.cpp:110 task = {m_callableWrapper = std::unique_ptr<WTF::Detail::CallableWrapperBase<void>> = {get() = 0x7f8c214ccf90}} #16 0x00007f8ca3922c1e in WebCore::TaskDispatcher<WebCore::Timer>::sharedTimerFired() () at ../Source/WebCore/platform/GenericTaskQueue.cpp:85 queuedDispatchers = {m_start = 1, m_end = 5, m_buffer = {<WTF::VectorBufferBase<WTF::WeakPtr<WebCore::TaskDispatcher<WebCore::Timer> > >> = {m_buffer = 0x7f8c22482c00, m_capacity = 16, m_size = <optimized out>}, <No data fields>}} #17 0x00007f8ca394df74 in WebCore::ThreadTimers::sharedTimerFiredInternal() (this=0x7f8c9ad8e370) at ../Source/WebCore/platform/ThreadTimers.h:104 item = {static isRef = <error reading variable: Missing ELF symbol "WTF::Ref<WebCore::ThreadTimerHeapItem, WTF::DumbPtrTraits<WebCore::ThreadTimerHeapItem> >::isRef".>, m_ptr = 0x7f8c214a4600} timer = <optimized out> interval = <optimized out> timeToQuit = <optimized out> #18 0x00007f8ca394df74 in WebCore::ThreadTimers::sharedTimerFiredInternal() (this=0x7f8c9ad8e370) at ../Source/WebCore/platform/ThreadTimers.cpp:101 #19 0x00007f8ca0341448 in WTF::RunLoop::TimerBase::<lambda(gpointer)>::operator() (__closure=0x0, userData=0x7f8ca4e6a9d0 <WebCore::MainThreadSharedTimer::singleton()::instance+16>) at ../Source/WTF/wtf/glib/RunLoopGLib.cpp:177 timer = 0x7f8ca4e6a9d0 <WebCore::MainThreadSharedTimer::singleton()::instance+16> source = 0x55ad6cd8fb10 #20 0x00007f8ca0341448 in WTF::RunLoop::TimerBase::<lambda(gpointer)>::_FUN(gpointer) () at ../Source/WTF/wtf/glib/RunLoopGLib.cpp:183 #21 0x00007f8ca09c358e in g_main_context_remove_poll (context=0x55ad6cad3d90, fd=0x55ad6cd8fae0) at ../glib/gmain.c:4456 __func__ = "g_main_context_remove_poll" #22 0xffffffff06278ef0 in () #23 0x0000000000000001 in () #24 0x0000000000000000 in ()