Application: kwin_x11 (5.8.3)

Qt Version: 5.6.1
Frameworks Version: 5.26.0
Operating System: Linux 4.4.36-8-default x86_64
Distribution: "openSUSE Leap 42.2"

-- Information about the crash:
- What I was doing when the application crashed:
Closing Firefox 50.1.0 (with 6 open tabs)
openSUSE Leap 42.2 Kernel 4.4.36-8-default-x86_64 KDE Plasma 5.8.3 KDE Framework 5.26.0 Qt 5.6.1
There was a lot of random flashing of screen graphics with open windows breaking up. I ahve had similar problems before but those resulted in the KWin Greeter crashing and not restarting.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f94d5e29940 (LWP 2289))]

Thread 6 (Thread 0x7f94b37fe700 (LWP 15329)):
#0  0x00007f94d5587b03 in select () at /lib64/libc.so.6
#1  0x00007f94d2c5a849 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f94d2c5c0c3 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f94d2c5c527 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f94d2c0bfdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007f94d2a46f1a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f94cd6389b8 in  () at /usr/lib64/libQt5Qml.so.5
#7  0x00007f94d2a4b9e9 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f94d5850734 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f94d558ed3d in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f94a30aa700 (LWP 2419)):
#0  0x00007f94d58550af in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f94d1be193b in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007f94d1be1969 in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007f94d5850734 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f94d558ed3d in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f94b2d5f700 (LWP 2410)):
#0  0x00007f94d5587b03 in select () at /lib64/libc.so.6
#1  0x00007f94d2c5a849 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f94d2c5c0c3 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f94d2c5c527 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f94d2c0bfdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007f94d2a46f1a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f94cd6389b8 in  () at /usr/lib64/libQt5Qml.so.5
#7  0x00007f94d2a4b9e9 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f94d5850734 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f94d558ed3d in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f94b3fff700 (LWP 2373)):
#0  0x00007f94d2a443f0 in QMutex::lock() () at /usr/lib64/libQt5Core.so.5
#1  0x00007f94d2c5c4cd in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f94d2c0bfdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f94d2a46f1a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#4  0x00007f94cc8191d5 in  () at /usr/lib64/libQt5DBus.so.5
#5  0x00007f94d2a4b9e9 in  () at /usr/lib64/libQt5Core.so.5
#6  0x00007f94d5850734 in start_thread () at /lib64/libpthread.so.0
#7  0x00007f94d558ed3d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f94ba774700 (LWP 2364)):
#0  0x00007f94d558649d in poll () at /lib64/libc.so.6
#1  0x00007f94d470d3e2 in  () at /usr/lib64/libxcb.so.1
#2  0x00007f94d470efcf in xcb_wait_for_event () at /usr/lib64/libxcb.so.1
#3  0x00007f94bb850839 in  () at /usr/lib64/libQt5XcbQpa.so.5
#4  0x00007f94d2a4b9e9 in  () at /usr/lib64/libQt5Core.so.5
#5  0x00007f94d5850734 in start_thread () at /lib64/libpthread.so.0
#6  0x00007f94d558ed3d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f94d5e29940 (LWP 2289)):
[KCrash Handler]
#6  0x00007f94cd624dd0 in QQmlBinding::write(QQmlPropertyData const&, QV4::Value const&, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) () at /usr/lib64/libQt5Qml.so.5
#7  0x00007f94cd62624a in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () at /usr/lib64/libQt5Qml.so.5
#8  0x00007f94cd62f2f6 in  () at /usr/lib64/libQt5Qml.so.5
#9  0x00007f94cd5bd93b in QQmlComponentPrivate::complete(QQmlEnginePrivate*, QQmlComponentPrivate::ConstructionState*) () at /usr/lib64/libQt5Qml.so.5
#10 0x00007f94cd5bd9f7 in QQmlComponentPrivate::completeCreate() () at /usr/lib64/libQt5Qml.so.5
#11 0x00007f94cd5bd880 in QQmlComponent::create(QQmlContext*) () at /usr/lib64/libQt5Qml.so.5
#12 0x00007f94b2d7e7cf in  () at /usr/lib64/qt5/plugins/org.kde.kdecoration2/kwin5_aurorae.so
#13 0x00007f94d51b2047 in  () at /usr/lib64/libkwin.so.5
#14 0x00007f94d5096891 in KWin::Client::createDecoration(QRect const&) () at /usr/lib64/libkwin.so.5
#15 0x00007f94d50975ab in KWin::Client::updateDecoration(bool, bool) () at /usr/lib64/libkwin.so.5
#16 0x00007f94d50f8ed6 in KWin::Client::manage(unsigned int, bool) () at /usr/lib64/libkwin.so.5
#17 0x00007f94d507a994 in KWin::Workspace::createClient(unsigned int, bool) () at /usr/lib64/libkwin.so.5
#18 0x00007f94d50e70e0 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib64/libkwin.so.5
#19 0x00007f94d2c0b270 in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib64/libQt5Core.so.5
#20 0x00007f94bb84ebe4 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib64/libQt5XcbQpa.so.5
#21 0x00007f94bb850c3b in QXcbConnection::processXcbEvents() () at /usr/lib64/libQt5XcbQpa.so.5
#22 0x00007f94d2c39166 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#23 0x00007f94d3914e3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#24 0x00007f94d391949a in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#25 0x00007f94d2c0dfc5 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#26 0x00007f94d2c0fdaa in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib64/libQt5Core.so.5
#27 0x00007f94d2c5c4b4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#28 0x00007f94bb8b294d in  () at /usr/lib64/libQt5XcbQpa.so.5
#29 0x00007f94d2c0bfdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#30 0x00007f94d2c13ec6 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#31 0x00007f94d5a6e9cc in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
#32 0x00007f94d54c56e5 in __libc_start_main () at /lib64/libc.so.6
#33 0x0000000000400809 in _start ()

Reported using DrKonqi