Starting program: /usr/bin/qupzilla 
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffe491f700 (LWP 727)]
[New Thread 0x7fffd1022700 (LWP 728)]
[New Thread 0x7fffcbfff700 (LWP 729)]
[New Thread 0x7fff8adec700 (LWP 730)]
libpng warning: iCCP: Not recognizing known sRGB profile that has been edited (image/qpnghandler.cpp:499, void qt_png_warning(png_structp, png_const_charp))
QupZilla: 0 extensions loaded
[New Thread 0x7fff896c3700 (LWP 731)]
[New Thread 0x7fff88ec2700 (LWP 732)]
[New Thread 0x7fff83fff700 (LWP 733)]
[New Thread 0x7fff837fe700 (LWP 734)]

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) backtrace
#0  0x0000000000000000 in ?? ()
#1  0x00007ffff4b6703a in ?? () from /usr/lib/libQt5Widgets.so.5
#2  0x00007ffff4c5adc1 in QMessageBox::addButton(QMessageBox::StandardButton)
    () from /usr/lib/libQt5Widgets.so.5
#3  0x00007ffff4c5e612 in QMessageBox::showEvent(QShowEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#4  0x00007ffff4a7cf88 in QWidget::event(QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#5  0x00007ffff4c5b8d1 in QMessageBox::event(QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#6  0x00007ffff4a3f0fc in QApplicationPrivate::notify_helper(QObject*, QEvent*)
    () from /usr/lib/libQt5Widgets.so.5
#7  0x00007ffff4a443ae in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#8  0x00007ffff44bc5fb in QCoreApplication::notifyInternal(QObject*, QEvent*)
    () from /usr/lib/libQt5Core.so.5
#9  0x00007ffff4a7a56a in QWidgetPrivate::show_helper() ()
   from /usr/lib/libQt5Widgets.so.5
#10 0x00007ffff4a7c905 in QWidget::setVisible(bool) ()
   from /usr/lib/libQt5Widgets.so.5
#11 0x00007ffff4c3b958 in QDialog::setVisible(bool) ()
   from /usr/lib/libQt5Widgets.so.5
#12 0x00007ffff4c3b351 in QDialog::exec() () from /usr/lib/libQt5Widgets.so.5
#13 0x00007ffff4c5e119 in QMessageBox::aboutQt(QWidget*, QString const&) ()
   from /usr/lib/libQt5Widgets.so.5
#14 0x00007ffff4a3d28f in QApplication::aboutQt() ()
   from /usr/lib/libQt5Widgets.so.5
#15 0x00007ffff44eae9d in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/libQt5Core.so.5
---Type <return> to continue, or q <return> to quit---
#16 0x00007ffff4a378a2 in QAction::triggered(bool) ()
   from /usr/lib/libQt5Widgets.so.5
#17 0x00007ffff4a39f28 in QAction::activate(QAction::ActionEvent) ()
   from /usr/lib/libQt5Widgets.so.5
#18 0x00007ffff4bb6d3a in ?? () from /usr/lib/libQt5Widgets.so.5
#19 0x00007ffff4bbc584 in ?? () from /usr/lib/libQt5Widgets.so.5
#20 0x00007ffff4bc0cae in QMenu::mouseReleaseEvent(QMouseEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#21 0x00007ffff4a7cf88 in QWidget::event(QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#22 0x00007ffff4bc14c3 in QMenu::event(QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#23 0x00007ffff4a3f0fc in QApplicationPrivate::notify_helper(QObject*, QEvent*)
    () from /usr/lib/libQt5Widgets.so.5
#24 0x00007ffff4a44c26 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#25 0x00007ffff44bc5fb in QCoreApplication::notifyInternal(QObject*, QEvent*)
    () from /usr/lib/libQt5Core.so.5
#26 0x00007ffff4a43113 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) ()
   from /usr/lib/libQt5Widgets.so.5
#27 0x00007ffff4a9b5b7 in ?? () from /usr/lib/libQt5Widgets.so.5
#28 0x00007ffff4a9dc63 in ?? () from /usr/lib/libQt5Widgets.so.5
#29 0x00007ffff4a3f0fc in QApplicationPrivate::notify_helper(QObject*, QEvent*)
    () from /usr/lib/libQt5Widgets.so.5
#30 0x00007ffff4a443ae in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#31 0x00007ffff44bc5fb in QCoreApplication::notifyInternal(QObject*, QEvent*)
    () from /usr/lib/libQt5Core.so.5
---Type <return> to continue, or q <return> to quit---
#32 0x00007ffff181e370 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib/libQt5Gui.so.5
#33 0x00007ffff181fc55 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
#34 0x00007ffff180537f in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#35 0x00007fffe6c9fa50 in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#36 0x00007fffefcfcb84 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#37 0x00007fffefcfcdc8 in ?? () from /usr/lib/libglib-2.0.so.0
#38 0x00007fffefcfce6c in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#39 0x00007ffff4513b57 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#40 0x00007ffff44ba022 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#41 0x00007ffff44c19dc in QCoreApplication::exec() ()
   from /usr/lib/libQt5Core.so.5
#42 0x000000000040278e in ?? ()
#43 0x00007ffff3983000 in __libc_start_main () from /usr/lib/libc.so.6
#44 0x00000000004029c9 in ?? ()