Application: kwin_x11 (5.9.4)

Qt Version: 5.7.1
Frameworks Version: 5.31.0
Operating System: Linux 4.10.0-21-generic x86_64
Distribution: Ubuntu 17.04

-- Information about the crash:
- What I was doing when the application crashed:

- Unusual behavior I noticed:

- Custom settings of the application:

Click settings in virtualbox and close window settings, them crash kwin. Sorry for my englesh 
Many bugs in kde:(

The crash can be reproduced every time.

-- 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 0x7fee11a80900 (LWP 4959))]

Thread 9 (Thread 0x7fed37738700 (LWP 5935)):
#0  0x00007fee0ab18510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fee0eb18b4b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fee09f37495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fee09f37d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fee0eb17c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fee0ab126da in start_thread (arg=0x7fed37738700) at pthread_create.c:456
#6  0x00007fee1149b17f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7fedc8c09700 (LWP 5634)):
#0  0x00007fee0ab18510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fee0eb18b4b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fee09f37495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fee09f37d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fee0eb17c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fee0ab126da in start_thread (arg=0x7fedc8c09700) at pthread_create.c:456
#6  0x00007fee1149b17f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7fedf1a6a700 (LWP 5090)):
#0  0x00007fee0ab18510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fee0eb18b4b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fee09f37495 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fee09f37d8a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fee0eb17c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fee0ab126da in start_thread (arg=0x7fedf1a6a700) at pthread_create.c:456
#6  0x00007fee1149b17f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7fedc3fff700 (LWP 5089)):
#0  0x00007fee1148f251 in __GI_ppoll (fds=0x7fedbc000a58, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fee0ed37251 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fee0ed38b4a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fee0ece588a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fee0eb12fe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fee09865df5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007fee0eb17c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fee0ab126da in start_thread (arg=0x7fedc3fff700) at pthread_create.c:456
#8  0x00007fee1149b17f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7fedc0c26700 (LWP 4973)):
#0  0x00007fee0ab18510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fee0de932c4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fee0de93309 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fee0ab126da in start_thread (arg=0x7fedc0c26700) at pthread_create.c:456
#4  0x00007fee1149b17f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7feddd8f1700 (LWP 4969)):
#0  0x00007fee1148f251 in __GI_ppoll (fds=0x7fedd8000ac8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fee0ed37251 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fee0ed38b4a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fee0ece588a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fee0eb12fe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fee09865df5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007fee0eb17c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fee0ab126da in start_thread (arg=0x7feddd8f1700) at pthread_create.c:456
#8  0x00007fee1149b17f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7fedf09d1700 (LWP 4967)):
#0  0x00007fee1148f251 in __GI_ppoll (fds=0x7fede0000ac8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fee0ed37251 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fee0ed38b4a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fee0ece588a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fee0eb12fe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fee09865df5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007fee0eb17c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fee0ab126da in start_thread (arg=0x7fedf09d1700) at pthread_create.c:456
#8  0x00007fee1149b17f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7fedfa892700 (LWP 4962)):
#0  0x00007fee1148f251 in __GI_ppoll (fds=0x7fedf400d5a8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fee0ed37251 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fee0ed38b4a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fee0ece588a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fee0eb12fe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fee08a335c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007fee0eb17c98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fee0ab126da in start_thread (arg=0x7fedfa892700) at pthread_create.c:456
#8  0x00007fee1149b17f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7fee11a80900 (LWP 4959)):
[KCrash Handler]
#6  0x00000035002d0037 in  ()
#7  0x00007fee0ed196e0 in QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fee0ded4037 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#9  0x00007fee0ded40ff in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#10 0x00007fee0ded4382 in QScriptEngine::newQObject(QObject*, QScriptEngine::ValueOwnership, QFlags<QScriptEngine::QObjectWrapOption> const&) () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#11 0x00007fee1107595f in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#12 0x00007fee0ded45e5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#13 0x00007fee0defbbf6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#14 0x00007fee0df03ba1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#15 0x00007fee0ed13644 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007fee0e4cbe28 in KWin::EffectsHandler::desktopPresenceChanged(KWin::EffectWindow*, int, int) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.10
#17 0x00007fee0e4cd7f1 in  () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.10
#18 0x00007fee0ed14359 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fee0f9c635c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007fee0f9cdb11 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007fee0ece78a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007fee0ecea02d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007fee0ed38977 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007fedf98279fd in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#25 0x00007fee0ece588a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007fee0ecedffc in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007fee11764112 in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#28 0x00007fee113b33f1 in __libc_start_main (main=0x55bd8a8ca7e0, argc=3, argv=0x7ffdba269a48, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffdba269a38) at ../csu/libc-start.c:291
#29 0x000055bd8a8ca81a in _start ()

Reported using DrKonqi