Application: kwin_x11 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-33-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
- What I was doing when the application crashed:

I've switched to the console, and back and noticed that the app is crashed

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f66a94bb800 (LWP 1957))]

Thread 3 (Thread 0x7f6689cff700 (LWP 1986)):
#0  0x00007f66a8f7d743 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f66a77ae101 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f66a77afcd2 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f66a77b0275 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f66a77573e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f66a7516b44 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f66a1331f65 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f66a751bb0e in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f66a04f76aa in start_thread (arg=0x7f6689cff700) at pthread_create.c:333
#9  0x00007f66a8f86eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f667a9c4700 (LWP 2016)):
#0  0x00007f66a04fcda0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f66a630d644 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f66a630d689 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f66a04f76aa in start_thread (arg=0x7f667a9c4700) at pthread_create.c:333
#4  0x00007f66a8f86eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f66a94bb800 (LWP 1957)):
[KCrash Handler]
#6  0x00007f66a6d2224e in KWin::WindowQuadList::makeInterleavedArrays(unsigned int, KWin::GLVertex2D*, QMatrix4x4 const&) const () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.6
#7  0x00007f66a8b42f50 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#8  0x00007f66a8b48642 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#9  0x00007f66a8b48818 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#10 0x00007f66a8b61139 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#11 0x00007f66a68cb385 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#12 0x00007f66a8b610d1 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007f66a68412db in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#14 0x00007f66a8b610d1 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#15 0x00007f66a8b2a841 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#16 0x00007f66a8b60f7a in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#17 0x00007f66a6d1e651 in KWin::Effect::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.6
#18 0x00007f66a8b60f21 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#19 0x00007f66a6d1e651 in KWin::Effect::paintWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.6
#20 0x00007f66a8b60f21 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#21 0x00007f66a8b2eee8 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#22 0x00007f66a8b2cc0e in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#23 0x00007f66a8b3d513 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#24 0x00007f66a8b2a205 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#25 0x00007f66a8b60cff in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#26 0x00007f66a6d1e57f in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.6
#27 0x00007f66a8b60cad in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#28 0x00007f66a6d1e57f in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.6
#29 0x00007f66a8b60cad in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#30 0x00007f66a8b29e6a in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#31 0x00007f66a8b43da7 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#32 0x00007f66a8b23973 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#33 0x00007f66a778b6f3 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007f66a806bb2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#35 0x00007f66a8071000 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#36 0x00007f66a7759c2b in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007f66a77b1ae5 in QTimerInfoList::activateTimers() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007f66a77b0243 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#39 0x00007f669234996d in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#40 0x00007f66a77573e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#41 0x00007f66a775f02c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#42 0x00007f66a92548c3 in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#43 0x00007f66a8ea0a40 in __libc_start_main (main=0x400790 <main>, argc=3, argv=0x7ffea565fc38, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffea565fc28) at libc-start.c:289
#44 0x00000000004007c9 in _start ()

Reported using DrKonqi