crash when select fault section

Program received signal SIGTTIN, Stopped (tty input).
0x00007ffff6eb79be in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Gui.so.5
(gdb) bt
#0  0x00007ffff6eb79be in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Gui.so.5
#1  0x00007ffff6eb8eca in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Gui.so.5
#2  0x00007ffff6eba1f7 in QStroker::processCurrentSubpath() () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Gui.so.5
#3  0x00007ffff6eb31a0 in QStrokerOps::end() () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Gui.so.5
#4  0x00007ffff6eb4e41 in QStrokerOps::strokePath(QPainterPath const&, void*, QTransform const&) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Gui.so.5
#5  0x00007ffff6e7d76d in QPainterPathStroker::createStroke(QPainterPath const&) const () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Gui.so.5
#6  0x00007ffff773b07d in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#7  0x00007ffff773b9fb in QGraphicsLineItem::shape() const () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#8  0x00007ffff774c44c in QGraphicsItem::collidesWithItem(QGraphicsItem const*, Qt::ItemSelectionMode) const () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#9  0x00007ffff7770100 in QGraphicsScene::collidingItems(QGraphicsItem const*, Qt::ItemSelectionMode) const () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#10 0x00007ffff773f0e9 in QGraphicsItem::collidingItems(Qt::ItemSelectionMode) const () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#11 0x00000000004b2552 in netanim::AnimLink::paint (this=0x14d9fe0, painter=0x7fffffffb8d0, option=0xbf5b38, widget=0xc4bb20) at animlink.cpp:187
#12 0x00007ffff7781369 in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#13 0x00007ffff7781d82 in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#14 0x00007ffff7782760 in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#15 0x00007ffff77a55f7 in QGraphicsView::paintEvent(QPaintEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#16 0x00000000004b0fe3 in netanim::AnimatorView::paintEvent (this=0xc468e0, event=0x7fffffffc1e0) at animatorview.cpp:53
#17 0x00007ffff747edcc in QWidget::event(QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#18 0x00007ffff7585d86 in QFrame::event(QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#19 0x00007ffff77a669b in QGraphicsView::viewportEvent(QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#20 0x00007ffff6476b3d in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#21 0x00007ffff744325f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#22 0x00007ffff7446c36 in QApplication::notify(QObject*, QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#23 0x00007ffff64768d4 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#24 0x00007ffff746cf04 in QWidgetPrivate::sendPaintEvent(QRegion const&) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#25 0x00007ffff747b84d in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#26 0x00007ffff7450261 in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#27 0x00007ffff7450644 in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#28 0x00007ffff74713de in QWidgetPrivate::syncBackingStore() () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#29 0x00007ffff747f3ba in QWidget::event(QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#30 0x00007ffff759c89b in QMainWindow::event(QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#31 0x00007ffff7443294 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#32 0x00007ffff7446c36 in QApplication::notify(QObject*, QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#33 0x00007ffff64768d4 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#34 0x00007ffff64794b8 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#35 0x00007ffff77765a2 in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
---Type <return> to continue, or q <return> to quit---
#36 0x00007ffff777b579 in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#37 0x00007ffff64aaf66 in QObject::event(QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#38 0x00007ffff7788329 in QGraphicsScene::event(QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#39 0x00007ffff7443294 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#40 0x00007ffff7446c36 in QApplication::notify(QObject*, QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Widgets.so.5
#41 0x00007ffff64768d4 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#42 0x00007ffff64794b8 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#43 0x00007ffff64d0c53 in ?? () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#44 0x00007ffff4cc5642 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#45 0x00007ffff4cc9c98 in ?? () from /lib64/libglib-2.0.so.0
#46 0x00007ffff4cc9e4c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#47 0x00007ffff64d1084 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#48 0x00007ffff6474afb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#49 0x00007ffff6479a15 in QCoreApplication::exec() () from /opt/Qt5.4.2/5.4/gcc_64/lib/libQt5Core.so.5
#50 0x000000000046d04b in main (argc=1, argv=0x7fffffffe1f8) at main.cpp:48
(gdb) q
A debugging session is active.

    Inferior 1 [process 16981] will be killed.

Quit anyway? (y or n) y
[root@zsc65 netanim-3.106]#