Application: kwin_x11 (5.9.5)

Qt Version: 5.8.0
Frameworks Version: 5.33.0
Operating System: Linux 4.4.73-18.17-default x86_64
Distribution: "openSUSE Leap 42.2"

-- Information about the crash:
- What I was doing when the application crashed:
Trying to access a Gimp window on another desktop. I clicked on the Task Manager entry for this window and KDE crashed.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f2fd3193940 (LWP 1453))]

Thread 5 (Thread 0x7f2f2e365700 (LWP 1610)):
#0  0x00007f2fd28f32cf in ppoll () at /lib64/libc.so.6
#1  0x00007f2fcfffa8b1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f2fcfffbe7f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f2fcffae6ab in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f2fcfdf69aa in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#5  0x00007f2fca8fb108 in  () at /usr/lib64/libQt5Qml.so.5
#6  0x00007f2fcfdfb019 in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007f2fd2bc2744 in start_thread () at /lib64/libpthread.so.0
#8  0x00007f2fd28fbaad in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f2fb248f700 (LWP 1589)):
#0  0x00007f2fd2bc70bf in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2fcef6db1b in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007f2fcef6db49 in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007f2fd2bc2744 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f2fd28fbaad in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f2fb3d31700 (LWP 1573)):
#0  0x00007f2fd28f32cf in ppoll () at /lib64/libc.so.6
#1  0x00007f2fcfffa8b1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f2fcfffbe7f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f2fcffae6ab in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f2fcfdf69aa in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#5  0x00007f2fca8fb108 in  () at /usr/lib64/libQt5Qml.so.5
#6  0x00007f2fcfdfb019 in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007f2fd2bc2744 in start_thread () at /lib64/libpthread.so.0
#8  0x00007f2fd28fbaad in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f2fba9e9700 (LWP 1480)):
#0  0x00007f2fd2bc9d2d in read () at /lib64/libpthread.so.0
#1  0x00007f2fc735e670 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f2fc731de49 in g_main_context_check () at /usr/lib64/libglib-2.0.so.0
#3  0x00007f2fc731e2a8 in  () at /usr/lib64/libglib-2.0.so.0
#4  0x00007f2fc731e42c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#5  0x00007f2fcfffe8ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#6  0x00007f2fcffae6ab in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#7  0x00007f2fcfdf69aa in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#8  0x00007f2fc9aabd15 in  () at /usr/lib64/libQt5DBus.so.5
#9  0x00007f2fcfdfb019 in  () at /usr/lib64/libQt5Core.so.5
#10 0x00007f2fd2bc2744 in start_thread () at /lib64/libpthread.so.0
#11 0x00007f2fd28fbaad in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f2fd3193940 (LWP 1453)):
[KCrash Handler]
#6  0x00007f2fcffdcf4e in QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) () at /usr/lib64/libQt5Core.so.5
#7  0x00007f2fcefb1aab in  () at /usr/lib64/libQt5Script.so.5
#8  0x00007f2fcefb1b94 in  () at /usr/lib64/libQt5Script.so.5
#9  0x00007f2fcefb1e72 in QScriptEngine::newQObject(QObject*, QScriptEngine::ValueOwnership, QFlags<QScriptEngine::QObjectWrapOption> const&) () at /usr/lib64/libQt5Script.so.5
#10 0x00007f2fd24fecec in  () at /usr/lib64/libkwin.so.5
#11 0x00007f2fcefb215c in  () at /usr/lib64/libQt5Script.so.5
#12 0x00007f2fcefd4cde in  () at /usr/lib64/libQt5Script.so.5
#13 0x00007f2fcefdc3e5 in  () at /usr/lib64/libQt5Script.so.5
#14 0x00007f2fcffd869c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5
#15 0x00007f2fcf7a8398 in KWin::EffectsHandler::desktopPresenceChanged(KWin::EffectWindow*, int, int) () at /usr/lib64/libkwineffects.so.10
#16 0x00007f2fcf7a93ce in  () at /usr/lib64/libkwineffects.so.10
#17 0x00007f2fcffd9886 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#18 0x00007f2fd0c6c1bc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#19 0x00007f2fd0c730f0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#20 0x00007f2fcffb0245 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#21 0x00007f2fcffb22a3 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib64/libQt5Core.so.5
#22 0x00007f2fcfffbc84 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#23 0x00007f2fb85dd1dd in  () at /usr/lib64/libQt5XcbQpa.so.5
#24 0x00007f2fcffae6ab in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#25 0x00007f2fcffb6344 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#26 0x00007f2fd2de38a0 in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
#27 0x00007f2fd28326e5 in __libc_start_main () at /lib64/libc.so.6
#28 0x0000000000400809 in _start ()

Reported using DrKonqi