https://bugs.kde.org/show_bug.cgi?id=364740
Bug ID: 364740
Summary: DRM backend crashes on QEmu
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: crash
Priority: NOR
Component: backend-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: fab...@ritter-vogt.de
KWIN_COMPOSE=Q kwin_wayland --drm [...] crashes directly on startup on QEmu
(QXL).
The crash cause is a nullptr dereference in a comparision, with the following
backtrace:
#0 0x00007fffee75471a in QImage::fill(QColor const&) () from
/usr/lib64/libQt5Gui.so.5
#1 0x00007fffee7549ec in QImage::fill(Qt::GlobalColor) () from
/usr/lib64/libQt5Gui.so.5
#2 0x00007fffdcccd021 in KWin::DrmBackend::initCursor() () from
/usr/lib64/qt5/plugins/org.kde.kwin.waylandbackends/KWinWayland
DrmBackend.so
#3 0x00007fffdccce52f in KWin::DrmBackend::openDrm() () from
/usr/lib64/qt5/plugins/org.kde.kwin.waylandbackends/KWinWaylandDrm
Backend.so
#4 0x00007ffff5e7b44e in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib64/libQt5Core.so.5
#5 0x00007ffff7b29652 in
KWin::LogindIntegration::hasSessionControlChanged(bool) () from
/usr/lib64/libkwin.so.5
#6 0x00007ffff7abc894 in ?? () from /usr/lib64/libkwin.so.5
#7 0x00007ffff5e7b44e in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib64/libQt5Core.so.5
#8 0x00007fffeefc35ff in
QDBusPendingCallWatcher::finished(QDBusPendingCallWatcher*) () from
/usr/lib64/libQt5DBus.so.5
#9 0x00007fffeefc36f8 in ?? () from /usr/lib64/libQt5DBus.so.5
#10 0x00007ffff5e7bf99 in QObject::event(QEvent*) () from
/usr/lib64/libQt5Core.so.5
#11 0x00007ffff63fd9ac in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib64/libQt5Widgets.so.5
#12 0x00007ffff6405151 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#13 0x00007ffff5e4f018 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib64/libQt5Core.so.5
#14 0x00007ffff5e517f0 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () from /usr/lib64/libQt5Core.s
o.5
#15 0x00007ffff5ea086a in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib64/libQt5Co
re.so.5
#16 0x00007fffdee3196d in ?? () from
/usr/lib64/qt5/plugins/platforms/KWinQpaPlugin.so
#17 0x00007ffff5e4cfca in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib64/libQt5Core.so.5
#18 0x00007ffff5e558bc in QCoreApplication::exec() () from
/usr/lib64/libQt5Core.so.5
#19 0x0000000000408cb5 in ?? ()
#20 0x00007ffff5297741 in __libc_start_main () from /lib64/libc.so.6
#21 0x00000000004093e9 in _start ()
Reproducible: Always
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