Application: kwin_x11 (5.8.3)

Qt Version: 5.6.1
Frameworks Version: 5.26.0
Operating System: Linux 4.4.36-8-default x86_64
Distribution: "openSUSE Leap 42.2"

-- Information about the crash:
I was searching the keys.gnupg.net keyserver for a key to import and right as the search finished to list the keys kwin crashed.  I suspect this is the same behavoir exhibited from my virtualbox/kwin crash report.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f316e948940 (LWP 2689))]

Thread 7 (Thread 0x7f313f5ef700 (LWP 2978)):
#0  0x00007f316e0a5b03 in select () at /lib64/libc.so.6
#1  0x00007f316b778849 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f316b77a0c3 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f316b77a527 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f316b729fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007f316b564f1a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f31661519b8 in  () at /usr/lib64/libQt5Qml.so.5
#7  0x00007f316b5699e9 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f316e36e734 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f316e0acd3d in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7f3132689700 (LWP 2822)):
#0  0x00007f316e3730af in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f316a6fa93b in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007f316a6fa969 in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007f316e36e734 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f316e0acd3d in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f3133890700 (LWP 2810)):
#0  0x00007f316e3730af in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f313e77d533 in  () at /usr/lib64/dri/r600_dri.so
#2  0x00007f313e77cd57 in  () at /usr/lib64/dri/r600_dri.so
#3  0x00007f316e36e734 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f316e0acd3d in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f314d87c700 (LWP 2769)):
#0  0x00007f316e0a5b03 in select () at /lib64/libc.so.6
#1  0x00007f316b778849 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f316b77a0c3 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f316b77a527 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f316b729fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007f316b564f1a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f31661519b8 in  () at /usr/lib64/libQt5Qml.so.5
#7  0x00007f316b5699e9 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f316e36e734 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f316e0acd3d in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f314f17a700 (LWP 2719)):
#0  0x00007f316e0a5b03 in select () at /lib64/libc.so.6
#1  0x00007f316b778849 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007f316b77a0c3 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007f316b77a527 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007f316b729fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007f316b564f1a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f31653321d5 in  () at /usr/lib64/libQt5DBus.so.5
#7  0x00007f316b5699e9 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f316e36e734 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f316e0acd3d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f3155083700 (LWP 2715)):
#0  0x00007f316e0a449d in poll () at /lib64/libc.so.6
#1  0x00007f316d22b3e2 in  () at /usr/lib64/libxcb.so.1
#2  0x00007f316d22cfcf in xcb_wait_for_event () at /usr/lib64/libxcb.so.1
#3  0x00007f3155d33839 in  () at /usr/lib64/libQt5XcbQpa.so.5
#4  0x00007f316b5699e9 in  () at /usr/lib64/libQt5Core.so.5
#5  0x00007f316e36e734 in start_thread () at /lib64/libpthread.so.0
#6  0x00007f316e0acd3d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f316e948940 (LWP 2689)):
[KCrash Handler]
#6  0x0000000000000040 in  ()
#7  0x00007f316b75a950 in QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) () at /usr/lib64/libQt5Core.so.5
#8  0x00007f316a73e7eb in  () at /usr/lib64/libQt5Script.so.5
#9  0x00007f316a73e8c4 in  () at /usr/lib64/libQt5Script.so.5
#10 0x00007f316a73eb82 in QScriptEngine::newQObject(QObject*, QScriptEngine::ValueOwnership, QFlags<QScriptEngine::QObjectWrapOption> const&) () at /usr/lib64/libQt5Script.so.5
#11 0x00007f316dcbf91c in  () at /usr/lib64/libkwin.so.5
#12 0x00007f316a73eed2 in  () at /usr/lib64/libQt5Script.so.5
#13 0x00007f316a761d6e in  () at /usr/lib64/libQt5Script.so.5
#14 0x00007f316a769425 in  () at /usr/lib64/libQt5Script.so.5
#15 0x00007f316b756139 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5
#16 0x00007f316af23498 in KWin::EffectsHandler::desktopPresenceChanged(KWin::EffectWindow*, int, int) () at /usr/lib64/libkwineffects.so.9
#17 0x00007f316af24913 in  () at /usr/lib64/libkwineffects.so.9
#18 0x00007f316b757166 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#19 0x00007f316c432e3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#20 0x00007f316c43749a in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#21 0x00007f316b72bfc5 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#22 0x00007f316b72ddaa in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib64/libQt5Core.so.5
#23 0x00007f316b77a4b4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#24 0x00007f3155d9594d in  () at /usr/lib64/libQt5XcbQpa.so.5
#25 0x00007f316b729fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#26 0x00007f316b731ec6 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#27 0x00007f316e58c9cc in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
#28 0x00007f316dfe36e5 in __libc_start_main () at /lib64/libc.so.6
#29 0x0000000000400809 in _start ()

Reported using DrKonqi