Application: kwin_x11 (5.12.6)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-34-generic x86_64
Distribution: Ubuntu 18.04.1 LTS

-- Information about the crash:
- What I was doing when the application crashed:
simply dragging a window on the desktop.  OS is ubu 18.04.1 lts, current patches as of 18.09.16.

-- 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 0x7f053b304cc0 (LWP 4481))]

Thread 5 (Thread 0x7f04fe19b700 (LWP 4516)):
#0  0x00007f0533ccf9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f0537266fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f0533ccf9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f0537266f68, cond=0x7f0537266f90) at pthread_cond_wait.c:502
#2  0x00007f0533ccf9f3 in __pthread_cond_wait (cond=0x7f0537266f90, mutex=0x7f0537266f68) at pthread_cond_wait.c:655
#3  0x00007f0536f705f4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f0536f70639 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f0533cc96db in start_thread (arg=0x7f04fe19b700) at pthread_create.c:463
#6  0x00007f053ac7488f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f04ffb9d700 (LWP 4511)):
#0  0x00007f0533ccf9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55637689e848) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f0533ccf9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55637689e7f8, cond=0x55637689e820) at pthread_cond_wait.c:502
#2  0x00007f0533ccf9f3 in __pthread_cond_wait (cond=0x55637689e820, mutex=0x55637689e7f8) at pthread_cond_wait.c:655
#3  0x00007f0508a0346b in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007f0508a03197 in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#5  0x00007f0533cc96db in start_thread (arg=0x7f04ffb9d700) at pthread_create.c:463
#6  0x00007f053ac7488f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f05191b4700 (LWP 4499)):
#0  0x00007f053ac67cf6 in __GI_ppoll (fds=0x7f0510000d28, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f05380695c1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f053806acde in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f05380129ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0537e3122a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f05327b56f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007f0537e3616d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f0533cc96db in start_thread (arg=0x7f05191b4700) at pthread_create.c:463
#8  0x00007f053ac7488f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f051b12b700 (LWP 4483)):
#0  0x00007f053ac67cf6 in __GI_ppoll (fds=0x7f051400eb38, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f05380695c1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f053806acde in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f05380129ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0537e3122a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f053168ed45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007f0537e3616d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f0533cc96db in start_thread (arg=0x7f051b12b700) at pthread_create.c:463
#8  0x00007f053ac7488f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f053b304cc0 (LWP 4481)):
[KCrash Handler]
#6  0x00007f0508beb5f5 in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#7  0x00007f0508905bd0 in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#8  0x00007f05089021f9 in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#9  0x00007f050891ffa3 in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#10 0x00007f05088e42bb in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#11 0x00007f05088e45b8 in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#12 0x00007f0533654897 in KWin::GLVertexBuffer::render(QRegion const&, unsigned int, bool) () at /usr/lib/x86_64-linux-gnu/libkwinglutils.so.11
#13 0x00007f0533654950 in KWin::GLVertexBuffer::render(unsigned int) () at /usr/lib/x86_64-linux-gnu/libkwinglutils.so.11
#14 0x00007f0518399d41 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#15 0x00007f051839e7d8 in KWin::SceneOpenGL::paintBackground(QRegion) () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#16 0x00007f053a7c7ba4 in KWin::Scene::paintSimpleScreen(int, QRegion) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#17 0x00007f0518399c92 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#18 0x00007f053a7c8167 in KWin::Scene::finalPaintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#19 0x00007f053a7d64d5 in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#20 0x00007f05377d8401 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#21 0x00007f053a7d647d in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#22 0x00007f05377d8401 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#23 0x00007f053a7d647d in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#24 0x00007f05377d8401 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.11
#25 0x00007f053a7d647d in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#26 0x00007f053a7c7e5e in KWin::Scene::paintScreen(int*, QRegion const&, QRegion const&, QRegion*, QRegion*, QMatrix4x4 const&, QRect const&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#27 0x00007f051839f541 in KWin::SceneOpenGL::paint(QRegion, QList<KWin::Toplevel*>) () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#28 0x00007f053a7ba3e2 in KWin::Compositor::performCompositing() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#29 0x00007f05380440db in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007f0538d9282c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007f0538d9a0f4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#32 0x00007f05380149a8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007f053806cd8e in QTimerInfoList::activateTimers() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007f053806af42 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#35 0x00007f05228c55cd in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#36 0x00007f05380129ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007f053801ba84 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007f053af4cdbb in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#39 0x00007f053ab74b97 in __libc_start_main (main=0x556375956730, argc=3, argv=0x7fffdb0d73b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffdb0d73a8) at ../csu/libc-start.c:310
#40 0x000055637595676a in _start ()

Reported using DrKonqi