Selecting "GammaRay::OverlayWidget" in Widgets tree freezes GammaRay

[danvratil]

I attached GammaRay to a running process and started inspecting widgets in the "Widgets" tree. I accidentally selected a "GammaRay::OverlayWidget" item in the tree, which GammaRay injected into the widget hierarchy of the inspected application. This caused the inspected application to freeze and use 100% CPU.

Using GammaRay 2.2.1 with Qt 5.

[iamsergio]

Is there any use in showing these ? Maybe they should be hidden

[danvratil]

I think they are hidden by default (but I couldn't find the code), except for when a new dialog/window is created at runtime - at least that's my impression from the behaviour: I don't see the GammaRay::OverlayWidget anywhere in the tree when I start the app from GammaRay (or when I attach GammaRay to a running process), but I can see them when I open a dialog and start inspecting it - in this particular case it was KDevelop, and "Assign shortcut" dialog in Documentation toolview.

[milianw]

reproduced with Qt4 and kwrite. Didn't even have to open any other dialog.

(gdb) bt
#0 0x00007fa11f8b8a5b in QWidget::window() const () from /usr/lib/libQtGui.so.4
#1 0x00007fa11fa992ae in QWidgetPrivate::invalidateBuffer(QRect const&) () from /usr/lib/libQtGui.so.4
#2 0x00007fa11f90f5d9 in QWidgetPrivate::setParent_sys(QWidget_, QFlagsQt::WindowType) () from /usr/lib/libQtGui.so.4
#3 0x00007fa11f8cd2c7 in QWidget::setParent(QWidget_, QFlagsQt::WindowType) () from /usr/lib/libQtGui.so.4
#4 0x00007fa11f8cdfc2 in QWidget::setParent(QWidget_) () from /usr/lib/libQtGui.so.4
#5 0x00007fa08d824178 in GammaRay::OverlayWidget::placeOn(QWidget_) ()
from /ssd/milian/projects/compiled/kde4/lib/gammaray/2.3/qt4.8-x86_64/gammaray_widgetinspector_plugin.so
#6 0x00007fa08d81fc93 in GammaRay::WidgetInspectorServer::widgetSelected(QItemSelection const&) ()
from /ssd/milian/projects/compiled/kde4/lib/gammaray/2.3/qt4.8-x86_64/gammaray_widgetinspector_plugin.so
#7 0x00007fa08d827385 in GammaRay::WidgetInspectorServer::qt_static_metacall(QObject_, QMetaObject::Call, int, void__) ()
from /ssd/milian/projects/compiled/kde4/lib/gammaray/2.3/qt4.8-x86_64/gammaray_widgetinspector_plugin.so
#8 0x00007fa11ec568ac in QMetaObject::activate(QObject_, QMetaObject const_, int, void__) () from /usr/lib/libQtCore.so.4
#9 0x00007fa11fdf63a7 in QItemSelectionModel::selectionChanged(QItemSelection const&, QItemSelection const&) ()
from /usr/lib/libQtGui.so.4
#10 0x00007fa11fdfbcce in QItemSelectionModel::emitSelectionChanged(QItemSelection const&, QItemSelection const&) ()
from /usr/lib/libQtGui.so.4
#11 0x00007fa11fdfc55b in QItemSelectionModel::select(QItemSelection const&, QFlagsQItemSelectionModel::SelectionFlag)
() from /usr/lib/libQtGui.so.4
#12 0x00007fa121a8dfbc in KLinkItemSelectionModel::select(QItemSelection const&, QFlagsQItemSelectionModel::SelectionFlag) () from /ssd/milian/projects/compiled/kde4/lib/libgammaray_common-qt4.8-x86_64.so.2.3.0
#13 0x00007fa11fde7508 in QTreeViewPrivate::select(QModelIndex const&, QModelIndex const&, QFlagsQItemSelectionModel::SelectionFlag) () from /usr/lib/libQtGui.so.4
#14 0x00007fa11fde7e8c in QTreeView::setSelection(QRect const&, QFlagsQItemSelectionModel::SelectionFlag) ()
from /usr/lib/libQtGui.so.4
#15 0x00007fa11fda4373 in QAbstractItemView::mousePressEvent(QMouseEvent_) () from /usr/lib/libQtGui.so.4
#16 0x00007fa11f8cc7e7 in QWidget::event(QEvent_) () from /usr/lib/libQtGui.so.4
#17 0x00007fa11fc8cbce in QFrame::event(QEvent_) () from /usr/lib/libQtGui.so.4
#18 0x00007fa11fdaa473 in QAbstractItemView::viewportEvent(QEvent_) () from /usr/lib/libQtGui.so.4
#19 0x00007fa11fdec810 in QTreeView::viewportEvent(QEvent_) () from /usr/lib/libQtGui.so.4
#20 0x00007fa11ec41ee6 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject_, QEvent_) ()
from /usr/lib/libQtCore.so.4
#21 0x00007fa11f8789dc in QApplicationPrivate::notify_helper(QObject_, QEvent_) () from /usr/lib/libQtGui.so.4
#22 0x00007fa11f87f5bf in QApplication::notify(QObject_, QEvent_) () from /usr/lib/libQtGui.so.4
#23 0x00007fa12084882a in KApplication::notify(QObject_, QEvent_) () from /usr/lib/libkdeui.so.5
#24 0x00007fa11ec41d7d in QCoreApplication::notifyInternal(QObject_, QEvent_) () from /usr/lib/libQtCore.so.4
#25 0x00007fa11f87ec1f in QApplicationPrivate::sendMouseEvent(QWidget_, QMouseEvent_, QWidget_, QWidget_, QWidget*_, QPoint---Type to continue, or q to quit---
er&, bool) () from /usr/lib/libQtGui.so.4
#26 0x00007fa11f8f5712 in ?? () from /usr/lib/libQtGui.so.4
#27 0x00007fa11f8f410c in QApplication::x11ProcessEvent(XEvent) () from /usr/lib/libQtGui.so.4
#28 0x00007fa11f91c262 in ?? () from /usr/lib/libQtGui.so.4
#29 0x00007fa11acc19fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0x00007fa11acc1ce0 in ?? () from /usr/lib/libglib-2.0.so.0
#31 0x00007fa11acc1d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0x00007fa11ec70e8d in QEventDispatcherGlib::processEvents(QFlagsQEventLoop::ProcessEventsFlag) ()
from /usr/lib/libQtCore.so.4
#33 0x00007fa11f91c326 in ?? () from /usr/lib/libQtGui.so.4
#34 0x00007fa11ec408d1 in QEventLoop::processEvents(QFlagsQEventLoop::ProcessEventsFlag) () from /usr/lib/libQtCore.so.4
#35 0x00007fa11ec40c35 in QEventLoop::exec(QFlagsQEventLoop::ProcessEventsFlag) () from /usr/lib/libQtCore.so.4
#36 0x00007fa11ec461d9 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#37 0x00007fa121b65808 in kdemain (argc=1, argv=0x7ffde72224b8)
at /ssd/milian/projects/kde4/kate/kwrite/kwritemain.cpp:739
#38 0x00007fa11da74800 in __libc_start_main () from /usr/lib/libc.so.6
#39 0x00000000004007ce in _start ()

[vkrause]

cedf07c and 048b384 should fix this.