Bug 391248

Application: kwin_x11 (5.8.7)

Qt Version: 5.6.2
Frameworks Version: 5.32.0
Operating System: Linux 4.4.114-42-default x86_64
Distribution: "openSUSE Leap 42.3"

-- Information about the crash:
I am Running Plasma KDE 4.14.33, which came with OpenSUSE Leap 42.3 on a HP TouchSmart Model IQ840 Desktop PC, equiped with an Intel Core 2 Duo CPU, 4 Gigs DRAM, 500 Gigs HD and Nvidia GeForce 9300 GS Graphics System. I am using the Nvidia Graphics Driver, which is included with OpenSUSE Leap 42.3 and all of the standard applications that came with this distribution. I have been using this system for about three months now with hardly a problem until today when I started the system and it booted up fine up to after I login to my own user account. Then Plasma KDE crashed for some reason. The system was shutdown correctly before this session.

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8953b13940 (LWP 4189))]

Thread 5 (Thread 0x7f89259b1700 (LWP 4364)):
#0  0x00007f89535690ff in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f894f8ec93b in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007f894f8ec969 in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007f8953564724 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f89532a3e8d in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f8926cf0700 (LWP 4332)):
[KCrash Handler]
#6  0x00007f89508b9add in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007f895085c85c in QLockFile::tryLock(int) () at /usr/lib64/libQt5Core.so.5
#8  0x00007f8952662369 in  () at /usr/lib64/libKF5ConfigCore.so.5
#9  0x00007f895264ee03 in KConfig::sync() () at /usr/lib64/libKF5ConfigCore.so.5
#10 0x00007f8935878c6c in  () at /usr/lib64/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#11 0x00007f8950949de3 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5
#12 0x00007f8950956dd2 in QTimer::timerEvent(QTimerEvent*) () at /usr/lib64/libQt5Core.so.5
#13 0x00007f895094abf4 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#14 0x00007f895162028c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#15 0x00007f89516248ea in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#16 0x00007f895091fbe5 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#17 0x00007f895096fafe in QTimerInfoList::activateTimers() () at /usr/lib64/libQt5Core.so.5
#18 0x00007f895096e448 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#19 0x00007f895091dbfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#20 0x00007f8950758f5a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#21 0x00007f895075da29 in  () at /usr/lib64/libQt5Core.so.5
#22 0x00007f8953564724 in start_thread () at /lib64/libpthread.so.0
#23 0x00007f89532a3e8d in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f8927d61700 (LWP 4331)):
#0  0x00007ffce8d6ab42 in clock_gettime ()
#1  0x00007f89532b0a86 in clock_gettime () at /lib64/libc.so.6
#2  0x00007f8950808a46 in  () at /usr/lib64/libQt5Core.so.5
#3  0x00007f895096e809 in QTimerInfoList::updateCurrentTime() () at /usr/lib64/libQt5Core.so.5
#4  0x00007f895096dc51 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#5  0x00007f895096e3a7 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#6  0x00007f895091dbfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#7  0x00007f8950758f5a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#8  0x00007f894b30b3d8 in  () at /usr/lib64/libQt5Qml.so.5
#9  0x00007f895075da29 in  () at /usr/lib64/libQt5Core.so.5
#10 0x00007f8953564724 in start_thread () at /lib64/libpthread.so.0
#11 0x00007f89532a3e8d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f893b034700 (LWP 4284)):
#0  0x00007f895329c973 in select () at /lib64/libc.so.6
#1  0x00007f895096c6c9 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f895096df43 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f895096e3a7 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f895091dbfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007f8950758f5a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f894a4e1295 in  () at /usr/lib64/libQt5DBus.so.5
#7  0x00007f895075da29 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f8953564724 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f89532a3e8d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f8953b13940 (LWP 4189)):
#0  0x00007f89535690ff in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f895075e69b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f895075d626 in QThread::wait(unsigned long) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f8935878a92 in KWin::X11StandalonePlatform::createOpenGLSafePoint(KWin::Platform::OpenGLSafePoint) () at /usr/lib64/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#4  0x00007f8952e3a1ea in KWin::Compositor::performCompositing() () at /usr/lib64/libkwin.so.5
#5  0x00007f895094abf4 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#6  0x00007f895162028c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#7  0x00007f89516248ea in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#8  0x00007f895091fbe5 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#9  0x00007f895096fafe in QTimerInfoList::activateTimers() () at /usr/lib64/libQt5Core.so.5
#10 0x00007f895096e448 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#11 0x00007f8938ce0e3d in  () at /usr/lib64/libQt5XcbQpa.so.5
#12 0x00007f895091dbfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#13 0x00007f8950925ae6 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#14 0x00007f89537829cc in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
#15 0x00007f89531d7725 in __libc_start_main () at /lib64/libc.so.6
#16 0x0000000000400809 in _start ()

Reported using DrKonqi