[Webkit-unassigned] [Bug 153829] New: Touch slider test fails due to assertion in webkitWebViewBaseTouchEvent()

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Feb 3 04:22:49 PST 2016 

https://bugs.webkit.org/show_bug.cgi?id=153829

            Bug ID: 153829
           Summary: Touch slider test fails due to assertion in
                    webkitWebViewBaseTouchEvent()
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aplazas at igalia.com
                CC: bugs-noreply at webkitgtk.org

The fast/events/touch/touch-slider.html test is crashing due to an assert in the GTK+ debug bot.

In the function handling touch events webkitWebViewBaseTouchEvent():
- when a touch event begins a touch event sequence, we add the sequence's ID to the set of the current touch sequences,
- when a touch event ends a touch event sequence, we remove the sequence's ID from the set of the current touch sequences,
- when a new touch event starts a new touch event sequence, as the previous suquence have ended, its ID is free to be used again and hence is used again (in the test, all sequences have the id 1).

Except this is true is we don't have gestures, when we do a gesture controller takes over the handling of the events, but as explained by some comment in webkitWebViewBaseTouchEvent(): "If we are already processing gestures is because the WebProcess didn't handle the BEGIN touch event, so pass subsequent events to the GestureController.".
Hence this happen:
- a touch event begins the touch event sequence of ID 1 and we add the sequence's ID to the set of the current touch sequences,
- the next events of the sequence are handled by the gesture controller,
- the touch event sequence of ID 1 ends and its ID can be used by another sequence,  but its ID have not been removed from the set of current sequences,
- a new touch event begins a new touch event sequence of ID 1 and when we try to add a sequence of ID 1 again, the assertion ASSERT(!priv->touchEvents.contains(sequence)) fails.

STDERR: ASSERTION FAILED: !priv->touchEvents.contains(sequence)
STDERR: ../../Source/WebKit2/UIProcess/API/gtk/WebKitWebViewBase.cpp(903) : gboolean webkitWebViewBaseTouchEvent(GtkWidget*, GdkEventTouch*)
STDERR: 1   0x7fe9bb420d61 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(WTFCrash+0x1e) [0x7fe9bb420d61]
STDERR: 2   0x7fe9b3d8ef7f /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(+0x4fdcf7f) [0x7fe9b3d8ef7f]
STDERR: 3   0x7fe9ae851c1e /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgtk-3.so.0(+0x29cc1e) [0x7fe9ae851c1e]
STDERR: 4   0x7fe9ae271942 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgobject-2.0.so.0(+0x11942) [0x7fe9ae271942]
STDERR: 5   0x7fe9ae271505 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgobject-2.0.so.0(+0x11505) [0x7fe9ae271505]
STDERR: 6   0x7fe9ae28b4a6 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x53a) [0x7fe9ae28b4a6]
STDERR: 7   0x7fe9ae28c610 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgobject-2.0.so.0(g_signal_emit+0xa6) [0x7fe9ae28c610]
STDERR: 8   0x7fe9ae9fe238 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgtk-3.so.0(+0x449238) [0x7fe9ae9fe238]
STDERR: 9   0x7fe9ae9fd6f1 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgtk-3.so.0(gtk_widget_event+0x112) [0x7fe9ae9fd6f1]
STDERR: 10  0x7fe9ae850377 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgtk-3.so.0(+0x29b377) [0x7fe9ae850377]
STDERR: 11  0x7fe9ae850669 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgtk-3.so.0(+0x29b669) [0x7fe9ae850669]
STDERR: 12  0x7fe9ae850738 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgtk-3.so.0(gtk_propagate_event+0xcc) [0x7fe9ae850738]
STDERR: 13  0x7fe9ae84f3b5 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libgtk-3.so.0(gtk_main_do_event+0x6f4) [0x7fe9ae84f3b5]
STDERR: 14  0x494e0e /home/slave/webkitgtk/gtk-linux-64-debug-tests/build/WebKitBuild/Debug/bin/WebKitTestRunner(WTR::EventSenderProxy::dispatchEvent(_GdkEvent*)+0x7e) [0x494e0e]
STDERR: 15  0x494eea /home/slave/webkitgtk/gtk-linux-64-debug-tests/build/WebKitBuild/Debug/bin/WebKitTestRunner(WTR::EventSenderProxy::sendOrQueueEvent(_GdkEvent*)+0x60) [0x494eea]
STDERR: 16  0x4961e2 /home/slave/webkitgtk/gtk-linux-64-debug-tests/build/WebKitBuild/Debug/bin/WebKitTestRunner(WTR::EventSenderProxy::sendUpdatedTouchEvents()+0xa0) [0x4961e2]
STDERR: 17  0x496282 /home/slave/webkitgtk/gtk-linux-64-debug-tests/build/WebKitBuild/Debug/bin/WebKitTestRunner(WTR::EventSenderProxy::touchStart()+0x18) [0x496282]
STDERR: 18  0x471893 /home/slave/webkitgtk/gtk-linux-64-debug-tests/build/WebKitBuild/Debug/bin/WebKitTestRunner(WTR::TestController::didReceiveSynchronousMessageFromInjectedBundle(OpaqueWKString const*, void const*)+0xb1b) [0x471893]
STDERR: 19  0x4702dc /home/slave/webkitgtk/gtk-linux-64-debug-tests/build/WebKitBuild/Debug/bin/WebKitTestRunner(WTR::TestController::didReceiveSynchronousPageMessageFromInjectedBundle(OpaqueWKPage const*, OpaqueWKString const*, void const*, void const**, void const*)+0x34) [0x4702dc]
STDERR: 20  0x7fe9b39f6542 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebKit::WebPageInjectedBundleClient::didReceiveSynchronousMessageFromInjectedBundle(WebKit::WebPageProxy*, WTF::String const&, API::Object*, WTF::RefPtr<API::Object>&)+0xaa) [0x7fe9b39f6542]
STDERR: 21  0x7fe9b39f8d96 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebKit::WebPageProxy::handleSynchronousMessage(IPC::Connection&, WTF::String const&, WebKit::UserData const&, WebKit::UserData&)+0xd6) [0x7fe9b39f8d96]
STDERR: 22  0x7fe9b3e5ebb4 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(void IPC::callMemberFunctionImpl<WebKit::WebPageProxy, void (WebKit::WebPageProxy::*)(IPC::Connection&, WTF::String const&, WebKit::UserData const&, WebKit::UserData&), std::tuple<WTF::String, WebKit::UserData>, 0ul, 1ul, std::tuple<WebKit::UserData>, 0ul>(WebKit::WebPageProxy*, void (WebKit::WebPageProxy::*)(IPC::Connection&, WTF::String const&, WebKit::UserData const&, WebKit::UserData&), IPC::Connection&, std::tuple<WTF::String, WebKit::UserData>&&, std::tuple<WebKit::UserData>&, std::index_sequence<0ul, 1ul>, std::index_sequence<0ul>)+0xba) [0x7fe9b3e5ebb4]
STDERR: 23  0x7fe9b3e524fe /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(void IPC::callMemberFunction<WebKit::WebPageProxy, void (WebKit::WebPageProxy::*)(IPC::Connection&, WTF::String const&, WebKit::UserData const&, WebKit::UserData&), std::tuple<WTF::String, WebKit::UserData>, std::make_index_sequence<2ul>, std::tuple<WebKit::UserData>, std::make_index_sequence<1ul> >(IPC::Connection&, std::tuple<WTF::String, WebKit::UserData>&&, std::tuple<WebKit::UserData>&, WebKit::WebPageProxy*, void (WebKit::WebPageProxy::*)(IPC::Connection&, WTF::String const&, WebKit::UserData const&, WebKit::UserData&))+0x54) [0x7fe9b3e524fe]
STDERR: 24  0x7fe9b3e4ed1f /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(void IPC::handleMessage<Messages::WebPageProxy::HandleSynchronousMessage, WebKit::WebPageProxy, void (WebKit::WebPageProxy::*)(IPC::Connection&, WTF::String const&, WebKit::UserData const&, WebKit::UserData&)>(IPC::Connection&, IPC::MessageDecoder&, IPC::MessageEncoder&, WebKit::WebPageProxy*, void (WebKit::WebPageProxy::*)(IPC::Connection&, WTF::String const&, WebKit::UserData const&, WebKit::UserData&))+0xc5) [0x7fe9b3e4ed1f]
STDERR: 25  0x7fe9b3e3f00e /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebKit::WebPageProxy::didReceiveSyncMessage(IPC::Connection&, IPC::MessageDecoder&, std::unique_ptr<IPC::MessageEncoder, std::default_delete<IPC::MessageEncoder> >&)+0x1976) [0x7fe9b3e3f00e]
STDERR: 26  0x7fe9b3906330 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(IPC::MessageReceiverMap::dispatchSyncMessage(IPC::Connection&, IPC::MessageDecoder&, std::unique_ptr<IPC::MessageEncoder, std::default_delete<IPC::MessageEncoder> >&)+0x126) [0x7fe9b3906330]
STDERR: 27  0x7fe9b39b2fec /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebKit::ChildProcessProxy::dispatchSyncMessage(IPC::Connection&, IPC::MessageDecoder&, std::unique_ptr<IPC::MessageEncoder, std::default_delete<IPC::MessageEncoder> >&)+0x34) [0x7fe9b39b2fec]
STDERR: 28  0x7fe9b3a74cba /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebKit::WebProcessProxy::didReceiveSyncMessage(IPC::Connection&, IPC::MessageDecoder&, std::unique_ptr<IPC::MessageEncoder, std::default_delete<IPC::MessageEncoder> >&)+0x30) [0x7fe9b3a74cba]
STDERR: 29  0x7fe9b38f3417 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(IPC::Connection::dispatchSyncMessage(IPC::MessageDecoder&)+0x2c9) [0x7fe9b38f3417]
STDERR: 30  0x7fe9b38f3973 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(IPC::Connection::dispatchMessage(std::unique_ptr<IPC::MessageDecoder, std::default_delete<IPC::MessageDecoder> >)+0x141) [0x7fe9b38f3973]
STDERR: 31  0x7fe9b38f3b7a /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(IPC::Connection::dispatchOneMessage()+0xc8) [0x7fe9b38f3b7a]
STDERR: LEAK: 33 RenderObject
STDERR: LEAK: 1 Page
STDERR: LEAK: 1 Frame
STDERR: LEAK: 5 CachedResource
STDERR: LEAK: 1 SubresourceLoader
STDERR: LEAK: 118 WebCoreNode
STDERR: LEAK: 1 WebPage
STDERR: LEAK: 1 WebFrame

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