Application: kwin_x11 (5.9.5)

Qt Version: 5.7.1
Frameworks Version: 5.33.0
Operating System: Linux 4.10.13-1-default x86_64
Distribution: "openSUSE Tumbleweed"

-- Information about the crash:
- What I was doing when the application crashed: Clicked "OK" on a Dialog from Oracle VM VirtualBox Manager then KWin crashed and restarted. Can be replicated most of the times

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7feef1602900 (LWP 21982))]

Thread 10 (Thread 0x7fee8e5ed700 (LWP 22009)):
#0  0x00007feeea1b89a6 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007feeed555974 in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007feeed5559b9 in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007feeea1b2537 in start_thread () at /lib64/libpthread.so.0
#4  0x00007feef0f8804f in clone () at /lib64/libc.so.6

Thread 9 (Thread 0x7feec0e8a700 (LWP 22004)):
#0  0x00007feef0f7e8ab in ppoll () at /lib64/libc.so.6
#1  0x00007feeee6064e1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007feeee607dda in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#3  0x00007feeee5b4b1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007feeee3e2813 in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#5  0x00007feee8cc5305 in  () at /usr/lib64/libQt5Qml.so.5
#6  0x00007feeee3e74c8 in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007feeea1b2537 in start_thread () at /lib64/libpthread.so.0
#8  0x00007feef0f8804f in clone () at /lib64/libc.so.6

Thread 8 (Thread 0x7feec3dda700 (LWP 22003)):
#0  0x00007feef0f7e8ab in ppoll () at /lib64/libc.so.6
#1  0x00007feeee6064e1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007feeee607dda in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#3  0x00007feeee5b4b1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007feeee3e2813 in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#5  0x00007feee8cc5305 in  () at /usr/lib64/libQt5Qml.so.5
#6  0x00007feeee3e74c8 in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007feeea1b2537 in start_thread () at /lib64/libpthread.so.0
#8  0x00007feef0f8804f in clone () at /lib64/libc.so.6

Thread 7 (Thread 0x7feeb062f700 (LWP 22002)):
#0  0x00007feeea1b89a6 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007feeba5c932b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007feeba5c9057 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007feeea1b2537 in start_thread () at /lib64/libpthread.so.0
#4  0x00007feef0f8804f in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7feeb0e30700 (LWP 22001)):
#0  0x00007feeea1b89a6 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007feeba5c932b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007feeba5c9057 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007feeea1b2537 in start_thread () at /lib64/libpthread.so.0
#4  0x00007feef0f8804f in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7feeb1631700 (LWP 22000)):
#0  0x00007feeea1b89a6 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007feeba5c932b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007feeba5c9057 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007feeea1b2537 in start_thread () at /lib64/libpthread.so.0
#4  0x00007feef0f8804f in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7feeb1e32700 (LWP 21999)):
#0  0x00007feeea1b89a6 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007feeba5c932b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007feeba5c9057 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007feeea1b2537 in start_thread () at /lib64/libpthread.so.0
#4  0x00007feef0f8804f in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7feeb283a700 (LWP 21998)):
#0  0x00007feeea1b89a6 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007feeba5c932b in  () at /usr/lib64/dri/radeonsi_dri.so
#2  0x00007feeba5c9057 in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007feeea1b2537 in start_thread () at /lib64/libpthread.so.0
#4  0x00007feef0f8804f in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7feedafda700 (LWP 21987)):
#0  0x00007feef0f7e8ab in ppoll () at /lib64/libc.so.6
#1  0x00007feeee6064e1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007feeee607dda in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#3  0x00007feeee5b4b1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007feeee3e2813 in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#5  0x00007feee7e7d385 in  () at /usr/lib64/libQt5DBus.so.5
#6  0x00007feeee3e74c8 in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007feeea1b2537 in start_thread () at /lib64/libpthread.so.0
#8  0x00007feef0f8804f in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7feef1602900 (LWP 21982)):
[KCrash Handler]
#6  0x0000000080000005 in  ()
#7  0x00007feeee5e8970 in QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) () at /usr/lib64/libQt5Core.so.5
#8  0x00007feeed597d0f in  () at /usr/lib64/libQt5Script.so.5
#9  0x00007feeed597dd4 in  () at /usr/lib64/libQt5Script.so.5
#10 0x00007feeed5980c2 in QScriptEngine::newQObject(QObject*, QScriptEngine::ValueOwnership, QFlags<QScriptEngine::QObjectWrapOption> const&) () at /usr/lib64/libQt5Script.so.5
#11 0x00007feef0b7de5c in  () at /usr/lib64/libkwin.so.5
#12 0x00007feeed598375 in  () at /usr/lib64/libQt5Script.so.5
#13 0x00007feeed5c0da6 in  () at /usr/lib64/libQt5Script.so.5
#14 0x00007feeed5c9071 in  () at /usr/lib64/libQt5Script.so.5
#15 0x00007feeee5e28d4 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5
#16 0x00007feeedd8c7d8 in KWin::EffectsHandler::desktopPresenceChanged(KWin::EffectWindow*, int, int) () at /usr/lib64/libkwineffects.so.10
#17 0x00007feeedd8e1a1 in  () at /usr/lib64/libkwineffects.so.10
#18 0x00007feeee5e35e9 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#19 0x00007feeef2abeac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#20 0x00007feeef2b3661 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#21 0x00007feeee5b6b30 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#22 0x00007feeee5b92bd in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib64/libQt5Core.so.5
#23 0x00007feeee607c07 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#24 0x00007feed8a2a29d in  () at /usr/lib64/libQt5XcbQpa.so.5
#25 0x00007feeee5b4b1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#26 0x00007feeee5bd28c in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#27 0x00007feef124c992 in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
#28 0x00007feef0ebb541 in __libc_start_main () at /lib64/libc.so.6
#29 0x00000000004006ea in _start ()

Reported using DrKonqi