Application: plasma-desktop (4.11.22)
KDE Platform Version: 4.14.32
Qt Version: 4.8.7
Operating System: Linux 4.4.153-smp i686
Distribution (Platform): Slackware Packages

-- Information about the crash:
- What I was doing when the application crashed:
I had just logged in after several hours of inactivity
- Unusual behavior I noticed:

System   froze after several hours of inactivity. I was not logged in during that time

The crash does not seem to be reproducible.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0xb532a740 (LWP 1432))]

Thread 3 (Thread 0xa0cbfb40 (LWP 1435)):
#0  0xffffffff in g_thread_self () at /usr/lib/libglib-2.0.so.0
#1  0xffffffff in g_main_context_acquire () at /usr/lib/libglib-2.0.so.0
#2  0xffffffff in  () at /usr/lib/libglib-2.0.so.0
#3  0xffffffff in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0xffffffff in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/qt/lib/libQtCore.so.4
#5  0xffffffff in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/qt/lib/libQtCore.so.4
#6  0xffffffff in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/qt/lib/libQtCore.so.4
#7  0xffffffff in QThread::exec() () at /usr/lib/qt/lib/libQtCore.so.4
#8  0xffffffff in  () at /usr/lib/qt/lib/libQtCore.so.4
#9  0xffffffff in  () at /usr/lib/qt/lib/libQtCore.so.4
#10 0xffffffff in start_thread () at /lib/libpthread.so.0
#11 0xffffffff in clone () at /lib/libc.so.6

Thread 2 (Thread 0xa35aab40 (LWP 1434)):
#0  0xffffffff in pthread_cond_wait@@GLIBC_2.3.2 () at /lib/libpthread.so.0
#1  0xffffffff in  () at /usr/lib/qt/lib/libQtScript.so.4
#2  0xffffffff in  () at /usr/lib/qt/lib/libQtScript.so.4
#3  0xffffffff in start_thread () at /lib/libpthread.so.0
#4  0xffffffff in clone () at /lib/libc.so.6

Thread 1 (Thread 0xb532a740 (LWP 1432)):
[KCrash Handler]
#6  0xffffffff in QX11Info::depth() const@plt () at /usr/lib/qt/lib/libQtGui.so.4
#7  0xffffffff in QX11PixmapData::fromImage(QImage const&, QFlags<Qt::ImageConversionFlag>) () at /usr/lib/qt/lib/libQtGui.so.4
#8  0xffffffff in  () at /usr/lib/qt/lib/libQtGui.so.4
#9  0xffffffff in  () at /usr/lib/qt/lib/libQtGui.so.4
#10 0xffffffff in  () at /usr/lib/qt/lib/libQtGui.so.4
#11 0xffffffff in QPainter::drawPixmap(QPointF const&, QPixmap const&) () at /usr/lib/qt/lib/libQtGui.so.4
#12 0xffffffff in  () at /usr/lib/kde4/plasma_applet_systemtray.so
#13 0xffffffff in  () at /usr/lib/kde4/plasma_applet_systemtray.so
#14 0xffffffff in QWidget::event(QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#15 0xffffffff in QX11EmbedContainer::event(QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#16 0xffffffff in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#17 0xffffffff in QApplication::notify(QObject*, QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#18 0xffffffff in KApplication::notify(QObject*, QEvent*) () at /usr/lib/libkdeui.so.5
#19 0xffffffff in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib/qt/lib/libQtCore.so.4
#20 0xffffffff in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/qt/lib/libQtGui.so.4
#21 0xffffffff in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/qt/lib/libQtGui.so.4
#22 0xffffffff in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/qt/lib/libQtGui.so.4
#23 0xffffffff in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/qt/lib/libQtGui.so.4
#24 0xffffffff in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /usr/lib/qt/lib/libQtGui.so.4
#25 0xffffffff in  () at /usr/lib/qt/lib/libQtGui.so.4
#26 0xffffffff in QWidgetPrivate::syncBackingStore() () at /usr/lib/qt/lib/libQtGui.so.4
#27 0xffffffff in QWidget::event(QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#28 0xffffffff in QFrame::event(QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#29 0xffffffff in QAbstractScrollArea::event(QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#30 0xffffffff in QGraphicsView::event(QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#31 0xffffffff in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#32 0xffffffff in QApplication::notify(QObject*, QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#33 0xffffffff in KApplication::notify(QObject*, QEvent*) () at /usr/lib/libkdeui.so.5
#34 0xffffffff in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib/qt/lib/libQtCore.so.4
#35 0xffffffff in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/qt/lib/libQtCore.so.4
#36 0xffffffff in QCoreApplication::sendPostedEvents(QObject*, int) () at /usr/lib/qt/lib/libQtCore.so.4
#37 0xffffffff in  () at /usr/lib/qt/lib/libQtGui.so.4
#38 0xffffffff in  () at /usr/lib/qt/lib/libQtGui.so.4
#39 0xffffffff in QMetaCallEvent::placeMetaCall(QObject*) () at /usr/lib/qt/lib/libQtCore.so.4
#40 0xffffffff in QObject::event(QEvent*) () at /usr/lib/qt/lib/libQtCore.so.4
#41 0xffffffff in QGraphicsScene::event(QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#42 0xffffffff in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#43 0xffffffff in QApplication::notify(QObject*, QEvent*) () at /usr/lib/qt/lib/libQtGui.so.4
#44 0xffffffff in KApplication::notify(QObject*, QEvent*) () at /usr/lib/libkdeui.so.5
#45 0xffffffff in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib/qt/lib/libQtCore.so.4
#46 0xffffffff in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/qt/lib/libQtCore.so.4
#47 0xffffffff in QCoreApplication::sendPostedEvents(QObject*, int) () at /usr/lib/qt/lib/libQtCore.so.4
#48 0xffffffff in  () at /usr/lib/qt/lib/libQtCore.so.4
#49 0xffffffff in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#50 0xffffffff in  () at /usr/lib/libglib-2.0.so.0
#51 0xffffffff in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#52 0xffffffff in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/qt/lib/libQtCore.so.4
#53 0xffffffff in  () at /usr/lib/qt/lib/libQtGui.so.4
#54 0xffffffff in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/qt/lib/libQtCore.so.4
#55 0xffffffff in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/qt/lib/libQtCore.so.4
#56 0xffffffff in QCoreApplication::exec() () at /usr/lib/qt/lib/libQtCore.so.4
#57 0xffffffff in QApplication::exec() () at /usr/lib/qt/lib/libQtGui.so.4
#58 0xffffffff in kdemain () at /usr/lib/libkdeinit4_plasma-desktop.so
#59 0x0804fe06 in _start ()

Reported using DrKonqi