please attach the output of
   qdbus org.kde.KWin /KWin supportInformation

(In reply to Thomas Lübking from comment #1)
> please attach the output of
>    qdbus org.kde.KWin /KWin supportInformation

How do I get that output?

run "konsole" and there enter

   qdbus org.kde.KWin /KWin supportInformation > kwin.support

kwin.support will contain the output.
Ensure to not have suspended the compositor when running this (it'd be worthless)

Hi!
kwin is still crashes when I go to a full screen application.
I think of a memory access problem ...
Here is the error report:

Application: KWin (kwin_x11), signal: Segmentation fault
 Using host libthread_db library "/lib64/libthread_db.so.1".
 [Current thread is 1 (Thread 0x7fde967ed840 (LWP 9717))]
 

 Thread 5 (Thread 0x7fde7c1c2700 (LWP 9721)):
 #0  0x00007fde96164bbd in poll () at /lib64/libc.so.6
 #1  0x00007fde93a97422 in  () at /usr/lib64/libxcb.so.1
 #2  0x00007fde93a9900f in xcb_wait_for_event () at /usr/lib64/libxcb.so.1
 #3  0x00007fde7d098d69 in  () at /usr/lib64/libQt5XcbQpa.so.5
 #4  0x00007fde93d5b079 in  () at /usr/lib64/libQt5Core.so.5
 #5  0x00007fde9577f0a4 in start_thread () at /lib64/libpthread.so.0
 #6  0x00007fde9616cfed in clone () at /lib64/libc.so.6
 

 Thread 4 (Thread 0x7fde7a0b5700 (LWP 9728)):
 #0  0x00007fde96166253 in select () at /lib64/libc.so.6
 #1  0x00007fde93f688e9 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
 #2  0x00007fde93f6a1b5 in  QEventDispatcherUNIXPrivate::doSelect(QFlags<QEven   tLoop::ProcessEventsFlag>, timespec*) () at  /usr/lib64/libQt5Core.so.5
 #3  0x00007fde93f6a5f7 in  QEventDispatcherUNIX::processEvents(QFlags<QEventL   oop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
 #4  0x00007fde93f1a04b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsF  lag>) () at /usr/lib64/libQt5Core.so.5
 #5  0x00007fde93d565da in QThread::exec() () at /usr/lib64/libQt5Core.so.5
 #6  0x00007fde8cda3095 in  () at /usr/lib64/libQt5DBus.so.5
 #7  0x00007fde93d5b079 in  () at /usr/lib64/libQt5Core.so.5
 #8  0x00007fde9577f0a4 in start_thread () at /lib64/libpthread.so.0
 #9  0x00007fde9616cfed in clone () at /lib64/libc.so.6
 

 Thread 3 (Thread 0x7fde6bfff700 (LWP 9730)):
 #0  0x00007fde96166253 in select () at /lib64/libc.so.6
 #1  0x00007fde93f688e9 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
 #2  0x00007fde93f6a1b5 in  QEventDispatcherUNIXPrivate::doSelect(QFlags<QEven   tLoop::ProcessEventsFlag>, timespec*) () at  /usr/lib64/libQt5Core.so.5
 #3  0x00007fde93f6a5f7 in  QEventDispatcherUNIX::processEvents(QFlags<QEventL   oop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
 #4  0x00007fde93f1a04b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsF  lag>) () at /usr/lib64/libQt5Core.so.5
 #5  0x00007fde93d565da in QThread::exec() () at /usr/lib64/libQt5Core.so.5
 #6  0x00007fde8de1c4d8 in  () at /usr/lib64/libQt5Qml.so.5
 #7  0x00007fde93d5b079 in  () at /usr/lib64/libQt5Core.so.5
 #8  0x00007fde9577f0a4 in start_thread () at /lib64/libpthread.so.0
 #9  0x00007fde9616cfed in clone () at /lib64/libc.so.6
 

 Thread 2 (Thread 0x7fde68ce0700 (LWP 9733)):
 #0  0x00007fde9578303f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
 #1  0x00007fde92cd197b in  () at /usr/lib64/libQt5Script.so.5
 #2  0x00007fde92cd19a9 in  () at /usr/lib64/libQt5Script.so.5
 #3  0x00007fde9577f0a4 in start_thread () at /lib64/libpthread.so.0
 #4  0x00007fde9616cfed in clone () at /lib64/libc.so.6
 

 Thread 1 (Thread 0x7fde967ed840 (LWP 9717)):
 [KCrash Handler]
 #6  0x00007fde96117d79 in __memcpy_sse2_unaligned () at /lib64/libc.so.6
 #7  0x00007fde8ee79643 in KWin::GLVertexBuffer::setData(int, int, float  const*, float const*) () at /usr/lib64/libkwinglutils.so.8
 #8  0x00007fde95d3482e in  () at /usr/lib64/libkwin.so.5
 #9  0x00007fde95d3a935 in  () at /usr/lib64/libkwin.so.5
 #10 0x00007fde95d2701e in  () at /usr/lib64/libkwin.so.5
 #11 0x00007fde95d34323 in  () at /usr/lib64/libkwin.so.5
 #12 0x00007fde95d28315 in  () at /usr/lib64/libkwin.so.5
 #13 0x00007fde95d4a9f0 in KWin::EffectsHandlerImpl::paintScreen(int,  QRegion, KWin::ScreenPaintData&) () at /usr/lib64/libkwin.so.5
 #14 0x00007fde934e246f in KWin::Effect::paintScreen(int, QRegion,  KWin::ScreenPaintData&) () at /usr/lib64/libkwineffects.so.8
 #15 0x00007fde95d4a9b0 in KWin::EffectsHandlerImpl::paintScreen(int,  QRegion, KWin::ScreenPaintData&) () at /usr/lib64/libkwin.so.5
 #16 0x00007fde934e246f in KWin::Effect::paintScreen(int, QRegion,  KWin::ScreenPaintData&) () at /usr/lib64/libkwineffects.so.8
 #17 0x00007fde95d4a9b0 in KWin::EffectsHandlerImpl::paintScreen(int,  QRegion, KWin::ScreenPaintData&) () at /usr/lib64/libkwin.so.5
 #18 0x00007fde934e246f in KWin::Effect::paintScreen(int, QRegion,  KWin::ScreenPaintData&) () at /usr/lib64/libkwineffects.so.8
 #19 0x00007fde95d4a9b0 in KWin::EffectsHandlerImpl::paintScreen(int,  QRegion, KWin::ScreenPaintData&) () at /usr/lib64/libkwin.so.5
 #20 0x00007fde95d27fb8 in  () at /usr/lib64/libkwin.so.5
 #21 0x00007fde95d3b4d4 in  () at /usr/lib64/libkwin.so.5
 #22 0x00007fde95d1c588 in KWin::Compositor::performCompositing() () at /usr/lib64/libkwin.so.5
 #23 0x00007fde93f46fc4 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
 #24 0x00007fde94c2060c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
 #25 0x00007fde94c24a22 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
 #26 0x00007fde93f1c005 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
 #27 0x00007fde93f6bd4e in QTimerInfoList::activateTimers() () at /usr/lib64/libQt5Core.so.5
 #28 0x00007fde93f6a698 in  QEventDispatcherUNIX::processEvents(QFlags<QEventL   oop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
 #29 0x00007fde7d0fa7dd in  () at /usr/lib64/libQt5XcbQpa.so.5
 #30 0x00007fde93f1a04b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsF  lag>) () at /usr/lib64/libQt5Core.so.5
 #31 0x00007fde93f21f56 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
 #32 0x00007fde96435d6a in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
 #33 0x00007fde960a9b05 in __libc_start_main () at /lib64/libc.so.6
 #34 0x00000000004007fe in _start ()

see comment #3 (and better also list the Qt version)

Hi!
I performed the operation above. I hope it worked.
Interestingly, I have no error with kwin since I disabled kscreen.
I disabled kscreen because the double screen configuration was not retained.
Would the two errors?
Greetings

I'd like to see the output of the command ;-)

Disabling kscreen will prevent the screen re-layout;
Qt is known to be über-crashy on randr events but this one might rather relate to a memory transferral between system and video RAM by the GPU driver.

Created attachment 98858 [details]
Additionnal information for bug kde#358133. Output file KWin supportInformation

Hi!
I put the output file attached to this message.
Regards,

Yupp, fits pattern of bug #355103 and friends.
I attached you there, since we need a reply from the OP to dupe this bug (but he's likely on nvidia as well ;-)

> Compositing Type: OpenGL
> OpenGL vendor string: NVIDIA Corporation
> OpenGL renderer string: GeForce GTX 560/PCIe/SSE2
> OpenGL version string: 3.1.0 NVIDIA 361.42
> OpenGL platform interface: GLX
> OpenGL shading language version string: 1.40 NVIDIA via Cg compiler
> Driver: NVIDIA
> Driver version: 361.42
> GPU class: GF100

*** Bug 364101 has been marked as a duplicate of this bug. ***

Hi Thomas!
Big update yesterday including the Nvidia drivers on openSUSE 42.1 Leap.
What gives me as config:
    KDE Plasma: 5.6.4
    KDE Frameworks: 5.22.0
    Qt: 5.6.0
    Kernel: 4.1.21-14-default
    Nvidia driver: 367.18
I can not reproduce the bug despite a dozen tests.
The old version of the driver is, for me, the cause of the problems.
Thank you for your help and consideration bug!
Cordially

Thanks for the update, however please notice that this bug can be heuristic (due to memory decay in the GPU)
#344326 will likely be resolved by listening to NV_robustness_video_memory_purge once it's provided and utilized in kwin. For the time being, let's hope nvidia acts more robust wrt to their memory.

*** This bug has been marked as a duplicate of bug 355103 ***