https://bugs.kde.org/show_bug.cgi?id=365471
Bug ID: 365471
Summary: KWin crashes when switching rendering backend with
QPainter scene
Product: kwin
Version: git master
Platform: Compiled Sources
OS: Linux
Status: UNCONFIRMED
Severity: minor
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: fab...@ritter-vogt.de
In a VM with virtio graphics, KWIN_COMPOSE=Q kwin_wayland [...] crashes when
the rendering backend is changed.
The actual backend doesn't seem to matter.
264 Window* w = stacking_order[ i ];
265 Toplevel* topw = w->window() <-- w is nullptr
266 WindowPrePaintData data;
Backtrace:
#0 0x00007fcf7c4600f2 in KWin::Scene::paintSimpleScreen
(this=this@entry=0x151f460, orig_mask=orig_mask@entry=0, region=...) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/scene.cpp:264
#1 0x00007fcf7c460f24 in KWin::Scene::finalPaintScreen (this=0x151f460,
mask=mask@entry=0, region=..., data=...) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/scene.cpp:201
#2 0x00007fcf7c489b3f in KWin::EffectsHandlerImpl::paintScreen
(this=0x15d0fe0, mask=0, region=..., data=...) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/effects.cpp:429
#3 0x00007fcf7c460bad in KWin::Scene::paintScreen (this=this@entry=0x151f460,
mask=mask@entry=0x7fffc220eeac, damage=..., repaint=...,
updateRegion=updateRegion@entry=0x7fffc220eec0,
validRegion=validRegion@entry=0x7fffc220eed0,
projection=...) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/scene.cpp:151
#4 0x00007fcf7c480e77 in KWin::SceneQPainter::paint (this=0x151f460,
damage=..., toplevels=...) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/scene_qpainter.cpp:159
#5 0x00007fcf7c45399a in KWin::Compositor::performCompositing
(this=this@entry=0x12e3140) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/composite.cpp:713
#6 0x00007fcf7c454039 in KWin::Compositor::startupWithWorkspace
(this=0x12e3140) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/composite.cpp:334
#7 0x00007fcf7c4549e3 in KWin::Compositor::slotCompositingOptionsInitialized
(this=this@entry=0x12e3140) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/composite.cpp:269
#8 0x00007fcf7c454f12 in KWin::Compositor::setup (this=0x12e3140) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/composite.cpp:180
#9 0x00007fcf7c45627c in KWin::Compositor::slotReinitialize (this=0x12e3140)
at /usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/composite.cpp:479
#10 0x00007fcf7c525b15 in KWin::Compositor::qt_metacall (this=0x12e3140,
_c=QMetaObject::InvokeMetaMethod, _id=7, _a=0x7fffc220f3c0) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/build/kwin_automoc.dir/moc_composite.cpp:332
#11 0x00007fcf7395ec90 in ?? () from /usr/lib64/libQt5DBus.so.5
#12 0x00007fcf7a862f99 in QObject::event(QEvent*) () from
/usr/lib64/libQt5Core.so.5
#13 0x00007fcf7ade49ac in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib64/libQt5Widgets.so.5
#14 0x00007fcf7adec151 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#15 0x00007fcf7a836018 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib64/libQt5Core.so.5
#16 0x00007fcf7a8387f0 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () from /usr/lib64/libQt5Core.so.5
#17 0x00007fcf7a88786a in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib64/libQt5Core.so.5
#18 0x00007fcf637fe8dd in QUnixEventDispatcherQPA::processEvents
(this=<optimized out>, flags=...) at
eventdispatchers/qunixeventdispatcher.cpp:68
#19 0x00007fcf7a833fca in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib64/libQt5Core.so.5
#20 0x00007fcf7a83c8bc in QCoreApplication::exec() () from
/usr/lib64/libQt5Core.so.5
#21 0x0000000000408d25 in main (argc=<optimized out>, argv=<optimized out>) at
/usr/src/debug/kwin-5.6.90git~20160704T143735~2b5747d/main_wayland.cpp:736
Reproducible: Always
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