crash when resizing vertically the overview window

[lutra]

Ok, this may be related to other tickets about crashes when resizing the overview window. In this case I'm experiencing the crash while resizing it vertically, not horizontally.

I'm under a fresh installation of Ubuntu 10,04 and a fresh installation of qgis trunk.

This is the message:

Warning: QPixmap::operator=: Cannot assign to pixmap during painting
Warning: QPainter::begin: A paint device can only be painted by one painter at a time.
Warning: QPainter::end: Painter not active, aborted
Warning: QPixmap::operator=: Cannot assign to pixmap during painting
Warning: QPainter::begin: A paint device can only be painted by one painter at a time.
Warning: QPainter::end: Painter not active, aborted
Warning: QPixmap::operator=: Cannot assign to pixmap during painting
Warning: QPainter::begin: A paint device can only be painted by one painter at a time.
Warning: QPainter::end: Painter not active, aborted
Segmentation fault

and this are the steps to replicate:

• open a new project
• add the "rede viaria layer" from this wfs server ​http://mapas.igeo.pt/wfs/sc500k.1
• set project CRS to epsg 3763
• right click on the layer and select "show in overview"
• right click on empty spot in the toolbars and activate the overview window
• in my case the overview window will show above the TOC window and with a very little height
• drag and drop the overview window under the TOC
• resize vertically the overview window -> qgis will crash with the above message or with just "seg fault"

not tested under windows.

[trapanator]

Windows 1.5.0 build here running on Windows XP. Doesn't seg fault.

But I discovered that if I drag the Overview, only some parts of the WFS layer are drawn.

[trapanator]

I think: it could be a QT bug?

[pcav]

Can anyone test it with different Qt versions, and note here which ones are working, and which not?

[trapanator]

Confirmed the bug here (Archlinux, QT 4.6.3, KDE 4.5.1). I've compiled QGIS with debugging options on, here's the backtrace of the segmentation fault:

Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 224: (render) ========== Rendering ==========
Warning: QPainter::end: Painter not active, aborted
Debug: /usr/local/src/qgis_unstable/src/gui/qgsmapoverviewcanvas.cpp: 162: (drawExtentRect) panning: extent to widget: [0,23] [251x129]
Warning: QPixmap::operator=: Cannot assign to pixmap during painting
Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 195: (adjustExtentToSize) Map units per pixel (x,y) : 5041.32, 4900.5

Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 196: (adjustExtentToSize) Pixmap dimensions (x,y) : 250, 179

Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 197: (adjustExtentToSize) Extent dimensions (x,y) : 1.26033e+06, 877190

Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 198: (adjustExtentToSize) -594174.7892561983317137,-453595.0413223140058108 : 666155.7892561983317137,423595.0413223140058108
Debug: /usr/local/src/qgis_unstable/src/core/qgsscalecalculator.cpp: 139: (calculateGeographicDistance) Distance across map extent (m): 4.68037e+10
Debug: /usr/local/src/qgis_unstable/src/core/qgsscalecalculator.cpp: 90: (calculate) Using conversionFactor of 39.3701
Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 209: (adjustExtentToSize) Scale (assuming meters as map units) = 1:7.07584e+11
Warning: QPainter::begin: A paint device can only be painted by one painter at a time.
Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 224: (render) ========== Rendering ==========
Warning: QPainter::end: Painter not active, aborted
Debug: /usr/local/src/qgis_unstable/src/gui/qgsmapoverviewcanvas.cpp: 162: (drawExtentRect) panning: extent to widget: [0,26] [251x128]
Warning: QPixmap::operator=: Cannot assign to pixmap during painting
Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 195: (adjustExtentToSize) Map units per pixel (x,y) : 5041.32, 4851.6

Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 196: (adjustExtentToSize) Pixmap dimensions (x,y) : 250, 186

Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 197: (adjustExtentToSize) Extent dimensions (x,y) : 1.26033e+06, 902397

Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 198: (adjustExtentToSize) -594174.7892561983317137,-466198.3471074380213395 : 666155.7892561983317137,436198.3471074380213395
Debug: /usr/local/src/qgis_unstable/src/core/qgsscalecalculator.cpp: 139: (calculateGeographicDistance) Distance across map extent (m): 4.68037e+10
Debug: /usr/local/src/qgis_unstable/src/core/qgsscalecalculator.cpp: 90: (calculate) Using conversionFactor of 39.3701
Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 209: (adjustExtentToSize) Scale (assuming meters as map units) = 1:7.07584e+11
Warning: QPainter::begin: A paint device can only be painted by one painter at a time.

[trapanator]

the part above is generated when I am resizing the overview. This is the last that generates the segmentation fault:

Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 224: (render) ========== Rendering ==========
Warning: QPainter::end: Painter not active, aborted
Debug: /usr/local/src/qgis_unstable/src/gui/qgsmapoverviewcanvas.cpp: 162: (drawExtentRect) panning: extent to widget: [0,29] [251x129]
Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 481: (render) Layer rendered without issues
Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 521: (render) Done rendering map layers
Debug: /usr/local/src/qgis_unstable/src/core/qgsmaprenderer.cpp: 599: (render) Rendering completed in (seconds): 0.281
Debug: /usr/local/src/qgis_unstable/src/gui/qgsmapoverviewcanvas.cpp: 162: (drawExtentRect) panning: extent to widget: [0,29] [251x129]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6885c1d in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
(gdb) bt
#0  0x00007ffff6885c1d in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#1  0x00007ffff6774662 in QVariantAnimation::valueChanged(QVariant const&) () from /usr/lib/libQtCore.so.4
#2  0x00007ffff677477c in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007ffff6774976 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007ffff67776ee in QPropertyAnimation::updateState(QAbstractAnimation::State, QAbstractAnimation::State) () from /usr/lib/libQtCore.so.4
#5  0x00007ffff6772ca6 in ?? () from /usr/lib/libQtCore.so.4
#6  0x00007ffff60e2378 in ?? () from /usr/lib/libQtGui.so.4
#7  0x00007ffff60477fe in ?? () from /usr/lib/libQtGui.so.4
#8  0x00007ffff604db77 in ?? () from /usr/lib/libQtGui.so.4
#9  0x00007ffff60712a9 in ?? () from /usr/lib/libQtGui.so.4
#10 0x00007ffff688335e in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#11 0x00007ffff5c6a854 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#12 0x00007ffff5c6e93a in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#13 0x00007ffff75eb19b in QgsApplication::notify (this=0x7fffffffdd70, receiver=0xc84ed0, event=0x7fffffffd960)
    at /usr/local/src/qgis_unstable/src/core/qgsapplication.cpp:88
#14 0x00007ffff6871d3c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0x00007ffff689d1d2 in ?? () from /usr/lib/libQtCore.so.4
#16 0x00007ffff689a184 in ?? () from /usr/lib/libQtCore.so.4
#17 0x00007ffff25cdb23 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#18 0x00007ffff25ce300 in ?? () from /usr/lib/libglib-2.0.so.0
#19 0x00007ffff25ce59d in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#20 0x00007ffff689a82f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#21 0x00007ffff5d0a37e in ?? () from /usr/lib/libQtGui.so.4
#22 0x00007ffff6871122 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#23 0x00007ffff687135c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#24 0x00007ffff687576b in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#25 0x0000000000529b46 in main (argc=1, argv=0x7fffffffe528) at /usr/local/src/qgis_unstable/src/app/main.cpp:802

[pcav]

I cannot reproduce it with libqtcore4 4:4.6.3-4 on Debian unstable

[lutra]

still true on trunk/ubuntu and libqtcore4 4:4.6.2-0

[lutra]

it crashes also on ubuntu 10.10, qgis trunk and libqtcore4 4:4.7.0-0

[volter]

Confirmed for Fedora 14, QGIS 1.6, Qt 4.7.0-8.

[jef]

see also #3396.

[jef]

duplicate of #2714