#0  0x00007fffec02b285 in QWebEnginePagePrivate::bindPageAndWidget (page=0x0, 
    widget=0x1ef5ab0) at api/qwebenginepage.h:358
#1  0x00007fffec03baa1 in QtWebEngineCore::RenderWidgetHostViewQtDelegateWidget::~RenderWidgetHostViewQtDelegateWidget (this=0x1ef5ab0, __in_chrg=<optimized out>)
    at render_widget_host_view_qt_delegate_widget.cpp:174
#2  0x00007fffec03baf9 in QtWebEngineCore::RenderWidgetHostViewQtDelegateWidget::~RenderWidgetHostViewQtDelegateWidget (this=0x1ef5ab0, __in_chrg=<optimized out>)
    at render_widget_host_view_qt_delegate_widget.cpp:172
#3  0x00007fffe4a0064b in std::default_delete<QtWebEngineCore::RenderWidgetHostViewQtDelegate>::operator() (this=0x1ef4448, __ptr=<optimized out>)
    at /usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/bits/unique_ptr.h:347
#4  std::unique_ptr<QtWebEngineCore::RenderWidgetHostViewQtDelegate, std::default_delete<QtWebEngineCore::RenderWidgetHostViewQtDelegate> >::~unique_ptr (this=0x1ef4448, 
    __in_chrg=<optimized out>)
    at /usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/bits/unique_ptr.h:274
#5  QtWebEngineCore::RenderWidgetHostViewQt::~RenderWidgetHostViewQt (this=0x1ef3fb0, 
    __in_chrg=<optimized out>)
    at /usr/src/debug/dev-qt/qtwebengine-5.12.3/qtwebengine-everywhere-src-5.12.3/src/core/render_widget_host_view_qt.cpp:304
#6  0x00007fffe4a00791 in QtWebEngineCore::RenderWidgetHostViewQt::~RenderWidgetHostViewQt (this=0x1ef3fb0, __in_chrg=<optimized out>)
    at /usr/src/debug/dev-qt/qtwebengine-5.12.3/qtwebengine-everywhere-src-5.12.3/src/core/render_widget_host_view_qt.cpp:304
#7  0x00007fffe63de99b in content::RenderWidgetHostImpl::Destroy(bool) ()
   from /usr/lib64/libQt5WebEngineCore.so.5
#8  0x00007fffe63ce1a6 in content::RenderViewHostImpl::ShutdownAndDestroy() ()
   from /usr/lib64/libQt5WebEngineCore.so.5
#9  0x00007fffe61cd601 in content::FrameTree::ReleaseRenderViewHostRef(content::RenderViewHostImpl*) () from /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007fffe620b221 in content::RenderFrameHostImpl::~RenderFrameHostImpl() ()
   from /usr/lib64/libQt5WebEngineCore.so.5
#11 0x00007fffe620bcf1 in content::RenderFrameHostImpl::~RenderFrameHostImpl() ()
   from /usr/lib64/libQt5WebEngineCore.so.5
#12 0x00007fffe621ce60 in content::RenderFrameHostManager::~RenderFrameHostManager() ()
   from /usr/lib64/libQt5WebEngineCore.so.5
#13 0x00007fffe61d113b in content::FrameTreeNode::~FrameTreeNode() ()
   from /usr/lib64/libQt5WebEngineCore.so.5
#14 0x00007fffe61cc83b in content::FrameTree::~FrameTree() ()
   from /usr/lib64/libQt5WebEngineCore.so.5
#15 0x00007fffe64e73af in content::WebContentsImpl::~WebContentsImpl() ()
   from /usr/lib64/libQt5WebEngineCore.so.5
#16 0x00007fffe64e7671 in content::WebContentsImpl::~WebContentsImpl() ()
   from /usr/lib64/libQt5WebEngineCore.so.5
#17 0x00007fffe4a152e7 in std::default_delete<content::WebContents>::operator() (
    this=0x1e834b8, __ptr=<optimized out>)
    at /usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/bits/unique_ptr.h:347
#18 std::unique_ptr<content::WebContents, std::default_delete<content::WebContents> >::~unique_ptr (this=0x1e834b8, __in_chrg=<optimized out>)
    at /usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/bits/unique_ptr.h:274
#19 QtWebEngineCore::WebContentsAdapter::~WebContentsAdapter (this=0x1e834a0, 
    __in_chrg=<optimized out>)
    at /usr/src/debug/dev-qt/qtwebengine-5.12.3/qtwebengine-everywhere-src-5.12.3/src/core/web_contents_adapter.cpp:428
#20 0x00007fffec0311aa in QtSharedPointer::ExternalRefCountData::destroy (this=0x1e83490)
    at /usr/include/qt5/QtCore/qsharedpointer_impl.h:157
#21 QSharedPointer<QtWebEngineCore::WebContentsAdapter>::deref (dd=0x1e83490)
    at /usr/include/qt5/QtCore/qsharedpointer_impl.h:465
#22 QSharedPointer<QtWebEngineCore::WebContentsAdapter>::deref (this=<optimized out>)
    at /usr/include/qt5/QtCore/qsharedpointer_impl.h:460
#23 QSharedPointer<QtWebEngineCore::WebContentsAdapter>::~QSharedPointer (
    this=<optimized out>, __in_chrg=<optimized out>)
    at /usr/include/qt5/QtCore/qsharedpointer_impl.h:315
#24 QWebEnginePagePrivate::~QWebEnginePagePrivate (this=<optimized out>, 
    __in_chrg=<optimized out>) at api/qwebenginepage.cpp:263
#25 0x00007fffec031239 in QWebEnginePagePrivate::~QWebEnginePagePrivate (this=0x1e83220, 
    __in_chrg=<optimized out>) at api/qwebenginepage.cpp:263
#26 0x00007fffec0281da in QWebEnginePagePrivate::releaseProfile (this=0x1e83220)
    at /usr/include/qt5/QtCore/qscopedpointer.h:162
#27 0x00007fffe49f192e in QtWebEngineCore::ProfileAdapter::~ProfileAdapter (
    this=0x1e7ebd0, __in_chrg=<optimized out>)
    at /usr/include/qt5/QtCore/qarraydata.h:211
#28 0x00007fffe49f1c41 in QtWebEngineCore::ProfileAdapter::~ProfileAdapter (
    this=0x1e7ebd0, __in_chrg=<optimized out>)
    at /usr/src/debug/dev-qt/qtwebengine-5.12.3/qtwebengine-everywhere-src-5.12.3/src/core/profile_adapter.cpp:94
#29 0x00007fffec03351d in QWebEngineProfilePrivate::~QWebEngineProfilePrivate (
    this=0x1e82e10, __in_chrg=<optimized out>)
    at /usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/bits/atomic_base.h:390
#30 0x00007fffec0335c9 in QWebEngineProfilePrivate::~QWebEngineProfilePrivate (
    this=0x1e82e10, __in_chrg=<optimized out>) at api/qwebengineprofile.cpp:169
#31 0x00007fffec03380a in QScopedPointerDeleter<QWebEngineProfilePrivate>::cleanup (
    pointer=<optimized out>) at /usr/include/qt5/QtCore/qscopedpointer.h:52
#32 QScopedPointer<QWebEngineProfilePrivate, QScopedPointerDeleter<QWebEngineProfilePrivate> >::~QScopedPointer (this=0x1e7eaa0, __in_chrg=<optimized out>)
    at /usr/include/qt5/QtCore/qscopedpointer.h:107
#33 QWebEngineProfile::~QWebEngineProfile (this=0x1e7ea90, __in_chrg=<optimized out>)
    at api/qwebengineprofile.cpp:321
#34 0x00007fffec033829 in QWebEngineProfile::~QWebEngineProfile (this=0x1e7ea90, 
    __in_chrg=<optimized out>) at api/qwebengineprofile.cpp:321
#35 0x00007ffff68ec33c in QObjectPrivate::deleteChildren() ()
   from /usr/lib64/libQt5Core.so.5
#36 0x00007ffff72117b6 in QWidget::~QWidget() () from /usr/lib64/libQt5Widgets.so.5
#37 0x00007ffff44e5299 in MessageViewer::MailWebEngineView::~MailWebEngineView() ()
   from /usr/lib64/libKF5MessageViewer.so.5
#38 0x00007ffff448e984 in ?? () from /usr/lib64/libKF5MessageViewer.so.5
#39 0x00007ffff448eb39 in ?? () from /usr/lib64/libKF5MessageViewer.so.5
#40 0x00007ffff68ec33c in QObjectPrivate::deleteChildren() ()
   from /usr/lib64/libQt5Core.so.5
#41 0x00007ffff72117b6 in QWidget::~QWidget() () from /usr/lib64/libQt5Widgets.so.5
#42 0x00007ffff44827b9 in MessageViewer::Viewer::~Viewer() ()
   from /usr/lib64/libKF5MessageViewer.so.5
#43 0x00007ffff68ec33c in QObjectPrivate::deleteChildren() ()
   from /usr/lib64/libQt5Core.so.5
#44 0x00007ffff72117b6 in QWidget::~QWidget() () from /usr/lib64/libQt5Widgets.so.5
#45 0x00007ffff7b6a0c9 in KMReaderWin::~KMReaderWin (this=0x1d5a270, 
    __in_chrg=<optimized out>)
    at /usr/src/debug/kde-apps/kmail-18.12.3-r1/kmail-18.12.3/src/kmreaderwin.cpp:227
#46 0x00007ffff68ec33c in QObjectPrivate::deleteChildren() ()
   from /usr/lib64/libQt5Core.so.5
#47 0x00007ffff72117b6 in QWidget::~QWidget() () from /usr/lib64/libQt5Widgets.so.5
#48 0x00007ffff619d3e4 in KMainWindow::~KMainWindow() ()
   from /usr/lib64/libKF5XmlGui.so.5
#49 0x00007ffff7b9b71b in KMReaderMainWin::~KMReaderMainWin (this=this@entry=0x1cd6c40, 
    __in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at /usr/src/debug/kde-apps/kmail-18.12.3-r1/kmail-18.12.3/src/kmreadermainwin.cpp:125
#50 0x00007ffff7b9b789 in KMReaderMainWin::~KMReaderMainWin (this=0x1cd6c40, 
    __in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at /usr/src/debug/kde-apps/kmail-18.12.3-r1/kmail-18.12.3/src/kmreadermainwin.cpp:122
#51 0x00007ffff68e6c78 in QObject::event(QEvent*) () from /usr/lib64/libQt5Core.so.5
#52 0x00007ffff721634b in QWidget::event(QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#53 0x00007ffff731e094 in QMainWindow::event(QEvent*) ()
   from /usr/lib64/libQt5Widgets.so.5
#54 0x00007ffff619f89b in KMainWindow::event(QEvent*) ()
   from /usr/lib64/libKF5XmlGui.so.5
#55 0x00007ffff61e9285 in KXmlGuiWindow::event(QEvent*) ()
   from /usr/lib64/libKF5XmlGui.so.5
#56 0x00007ffff71d65a1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib64/libQt5Widgets.so.5
#57 0x00007ffff71ddb40 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib64/libQt5Widgets.so.5
#58 0x00007ffff68be8b2 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib64/libQt5Core.so.5
#59 0x00007ffff68c1a17 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/libQt5Core.so.5
#60 0x00007ffff690ffe3 in ?? () from /usr/lib64/libQt5Core.so.5
#61 0x00007fffee2b762e in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#62 0x00007fffee2b78c8 in ?? () from /usr/lib64/libglib-2.0.so.0
#63 0x00007fffee2b795c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#64 0x00007ffff690fd83 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#65 0x00007ffff68bd89b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#66 0x00007ffff68c5612 in QCoreApplication::exec() () from /usr/lib64/libQt5Core.so.5
#67 0x000000000040433a in main (argc=<optimized out>, argv=<optimized out>)
    at /usr/include/qt5/QtCore/qcoreapplication.h:116