Application: kwin_x11 (5.12.5)

Qt Version: 5.10.0
Frameworks Version: 5.46.0
Operating System: Linux 4.4.126-48-default x86_64
Distribution: "openSUSE Leap 42.3"

-- Information about the crash:
- What I was doing when the application crashed:
The problem occured at the next reboot after the normal auto-update on 2018-05-23.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f0db672b940 (LWP 2753))]

Thread 3 (Thread 0x7f0d8ac74700 (LWP 2782)):
#0  0x00007f0db60b03cf in ppoll () at /lib64/libc.so.6
#1  0x00007f0db3557f61 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f0db355955f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f0db3507a4b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f0db334514a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#5  0x00007f0dadcbc3d8 in  () at /usr/lib64/libQt5Qml.so.5
#6  0x00007f0db3349e0f in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007f0daf205724 in start_thread () at /lib64/libpthread.so.0
#8  0x00007f0db60b8e8d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f0d9965e700 (LWP 2769)):
#0  0x00007f0db60b03cf in ppoll () at /lib64/libc.so.6
#1  0x00007f0db3557f61 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f0db355955f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f0db3507a4b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f0db334514a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#5  0x00007f0dacb627b5 in  () at /usr/lib64/libQt5DBus.so.5
#6  0x00007f0db3349e0f in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007f0daf205724 in start_thread () at /lib64/libpthread.so.0
#8  0x00007f0db60b8e8d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f0db672b940 (LWP 2753)):
[KCrash Handler]
#6  0x00007f0db5ca6754 in  () at /usr/lib64/libkwin.so.5
#7  0x00007f0db1c23581 in KDecoration2::DecoratedClient::color(KDecoration2::ColorGroup, KDecoration2::ColorRole) const () at /usr/lib64/libkdecorations2.so.5
#8  0x00007f0d8ba9a73e in  () at /usr/lib64/qt5/plugins/org.kde.kdecoration2/breezedecoration.so
#9  0x00007f0db5cb1819 in KWin::Decoration::Renderer::renderToImage(QRect const&) () at /usr/lib64/libkwin.so.5
#10 0x00007f0d98bef442 in  () at /usr/lib64/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#11 0x00007f0db3533c93 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5
#12 0x00007f0db3540ce7 in QTimer::timeout(QTimer::QPrivateSignal) () at /usr/lib64/libQt5Core.so.5
#13 0x00007f0db3540fc2 in QTimer::timerEvent(QTimerEvent*) () at /usr/lib64/libQt5Core.so.5
#14 0x00007f0db3534d04 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#15 0x00007f0db42287fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#16 0x00007f0db422f5e0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#17 0x00007f0db3509325 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#18 0x00007f0db355b62e in QTimerInfoList::activateTimers() () at /usr/lib64/libQt5Core.so.5
#19 0x00007f0db3559811 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#20 0x00007f0d9c8b173d in  () at /usr/lib64/libQt5XcbQpa.so.5
#21 0x00007f0db3507a4b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#22 0x00007f0db3510104 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#23 0x00007f0db637a4a8 in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
#24 0x00007f0db5fec725 in __libc_start_main () at /lib64/libc.so.6
#25 0x00000000004006a9 in _start ()

Reported using DrKonqi