Application: kwin_x11 (5.3.1)

Qt Version: 5.4.1
Operating System: Linux 3.16.7-21-desktop x86_64
Distribution: "openSUSE 13.2 (Harlequin) (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed: I had just rebooted my computer and logged in

- Unusual behavior I noticed: The lock screen would appear to flicker with white boxes (I think they were the error reports of the window manager crashing)

This happened multiple times, even after uninstalling and reinstalling kwin. I had to switch to openbox to do anything in a gui and even so kded5 is still crashing. 

My computer is set up to log me in automatically and require the password before I can use it.

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 0x7f7965a4c800 (LWP 2214))]

Thread 3 (Thread 0x7f7946761700 (LWP 2268)):
#0  0x00007f79653f72f3 in select () at /lib64/libc.so.6
#1  0x00007f79632a6539 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f79632a7eb5 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f79632a82fb in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f7963250d5b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007f7963073baa in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f795caaf3f8 in  () at /usr/lib64/libQt5Qml.so.5
#7  0x00007f79630787cf in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f7964cb20a4 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f79653fe08d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f7945606700 (LWP 2298)):
#0  0x00007f7964cb605f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f796182261b in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007f7961822649 in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007f7964cb20a4 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f79653fe08d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f7965a4c800 (LWP 2214)):
[KCrash Handler]
#4  0x00007f795fdb6807 in  () at /usr/lib64/libKF5Activities.so.5
#5  0x00007f7963283456 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#6  0x00007f7963070732 in QFutureWatcherBase::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#7  0x00007f7963f12b5c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#8  0x00007f7963f17a26 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#9  0x00007f7963252df5 in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#10 0x00007f7963254c8f in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib64/libQt5Core.so.5
#11 0x00007f79632a8284 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#12 0x00007f794eb6cb0d in  () at /usr/lib64/qt5/plugins/platforms/libqxcb.so
#13 0x00007f7963250d5b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#14 0x00007f79632583c6 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#15 0x00007f79656c5668 in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
#16 0x00007f796533ab05 in __libc_start_main () at /lib64/libc.so.6
#17 0x000000000040085e in _start ()

Reported using DrKonqi