Segfault with Qt-5.11.0

Wed May 23 01:08:58 PDT 2018

Dear all,

I'm getting a segfault when running Subsurface with Qt-5.11. It occurs
with both an old binary compiled against Qt-5.10 and a freshly rebuilt
binary. Note that building against Qt-5.11 requires fixing a couple of
headers, but that's unrelated:

	https://github.com/Subsurface-divelog/subsurface/pull/1317

The segfault occurs whenever the dive list is nonempty. With a new
profile, just click on "Log" then "Add Dive" and then "Apply Changes" to
trigger it. Here's a backtrace:

Thread 1 "subsurface" received signal SIGSEGV, Segmentation fault.
0x00007ffff05aa4d2 in QSortFilterProxyModel::parent(QModelIndex const&) const () from /usr/lib/libQt5Core.so.5
(gdb) bt
#0  0x00007ffff05aa4d2 in QSortFilterProxyModel::parent(QModelIndex const&) const () at /usr/lib/libQt5Core.so.5
#1  0x00007ffff291f60a in QTreeView::drawRow(QPainter*, QStyleOptionViewItem const&, QModelIndex const&) const () at /usr/lib/libQt5Widgets.so.5
#2  0x00007ffff2924e7f in QTreeView::drawTree(QPainter*, QRegion const&) const () at /usr/lib/libQt5Widgets.so.5
#3  0x00007ffff29299f8 in QTreeView::paintEvent(QPaintEvent*) () at /usr/lib/libQt5Widgets.so.5
#4  0x00007ffff26a0058 in QWidget::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#5  0x00007ffff27467df in QFrame::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#6  0x00007ffff28c0b84 in QAbstractItemView::viewportEvent(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#7  0x00007ffff292aa3c in QTreeView::viewportEvent(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#8  0x00007ffff05cf8db in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#9  0x00007ffff2660974 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#10 0x00007ffff266825b in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#11 0x00007ffff05cfbc9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007ffff26989bc in QWidgetPrivate::sendPaintEvent(QRegion const&) () at /usr/lib/libQt5Widgets.so.5
#13 0x00007ffff2699141 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
    at /usr/lib/libQt5Widgets.so.5
#14 0x00007ffff2699e2e in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#15 0x00007ffff2699d14 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#16 0x00007ffff2699d14 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#17 0x00007ffff2699d14 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#18 0x00007ffff2698f0d in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
    at /usr/lib/libQt5Widgets.so.5
#19 0x00007ffff2699e2e in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#20 0x00007ffff2698f0d in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
    at /usr/lib/libQt5Widgets.so.5
#21 0x00007ffff2699e2e in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#22 0x00007ffff2698f0d in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
    at /usr/lib/libQt5Widgets.so.5
#23 0x00007ffff2699e2e in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#24 0x00007ffff2699d14 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#25 0x00007ffff2699d14 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#26 0x00007ffff2698f0d in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
    at /usr/lib/libQt5Widgets.so.5
#27 0x00007ffff2699e2e in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#28 0x00007ffff2698f0d in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
    at /usr/lib/libQt5Widgets.so.5
#29 0x00007ffff2699e2e in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/libQt5Widgets.so.5
#30 0x00007ffff2698f0d in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
    at /usr/lib/libQt5Widgets.so.5
#31 0x00007ffff2670151 in  () at /usr/lib/libQt5Widgets.so.5
#32 0x00007ffff2670309 in  () at /usr/lib/libQt5Widgets.so.5
#33 0x00007ffff2687a57 in QWidgetPrivate::syncBackingStore() () at /usr/lib/libQt5Widgets.so.5
#34 0x00007ffff26a0199 in QWidget::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#35 0x00007ffff27b88b5 in QMainWindow::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#36 0x00007ffff2660984 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#37 0x00007ffff266825b in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#38 0x00007ffff05cfbc9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#39 0x00007ffff05d2c5c in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#40 0x00007ffff29700b6 in  () at /usr/lib/libQt5Widgets.so.5
#41 0x00007ffff2975679 in  () at /usr/lib/libQt5Widgets.so.5
#42 0x00007ffff05fa2e2 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#43 0x00007ffff298181c in QGraphicsScene::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#44 0x00007ffff2660984 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#45 0x00007ffff266825b in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#46 0x00007ffff05cfbc9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#47 0x00007ffff05d2c5c in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#48 0x00007ffff0623864 in  () at /usr/lib/libQt5Core.so.5
#49 0x00007fffea4a9368 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#50 0x00007fffea4a95b1 in  () at /usr/lib/libglib-2.0.so.0
#51 0x00007fffea4a963e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#52 0x00007ffff0622e49 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#53 0x00007fffe1b74b32 in  () at /usr/lib/libQt5XcbQpa.so.5
#54 0x00007ffff05ce85c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#55 0x00007ffff05d6b56 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#56 0x000055555565aaf0 in main ()

Any ideas how to debug this?

Cheers.

-- 
Gaetan