Application: kwin_x11 (5.6.4)

Qt Version: 5.6.1
Frameworks Version: 5.23.0
Operating System: Linux 4.6.0-1-amd64 x86_64
Distribution: Debian GNU/Linux testing (stretch)

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

Editing preferences in VirtualBox for virtual machine, and then for VirtualBox itself

- Custom settings of the application:

Most default KWin effects disabled

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 0x7f29741ba940 (LWP 13350))]

Thread 6 (Thread 0x7f293b7fe700 (LWP 13365)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f29713cc574 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f29713cc5b9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f296d97d464 in start_thread (arg=0x7f293b7fe700) at pthread_create.c:334
#4  0x00007f2973cc5e5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f294677b700 (LWP 13363)):
#0  0x00007f2973cbeb83 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f2972478a1f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f297247a45e in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f297247a972 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f2972425e4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f297224e9e4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f296c8da405 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f2972253808 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f296d97d464 in start_thread (arg=0x7f294677b700) at pthread_create.c:334
#9  0x00007f2973cc5e5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f2953765700 (LWP 13362)):
#0  0x00007f2973cbeb83 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f2972478a1f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f297247a45e in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f297247a972 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f2972425e4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f297224e9e4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f296c8da405 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f2972253808 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f296d97d464 in start_thread (arg=0x7f2953765700) at pthread_create.c:334
#9  0x00007f2973cc5e5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f2959e7a700 (LWP 13355)):
#0  0x00007f2973cbeb83 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f2972478a1f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f297247a45e in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f297247a972 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f2972425e4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f297224e9e4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f29742de515 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f2972253808 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f296d97d464 in start_thread (arg=0x7f2959e7a700) at pthread_create.c:334
#9  0x00007f2973cc5e5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f295b9c2700 (LWP 13353)):
#0  0x00007f2973cbcdcd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f2971f8e382 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f2971f8fff7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f295c468a89 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f2972253808 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f296d97d464 in start_thread (arg=0x7f295b9c2700) at pthread_create.c:334
#6  0x00007f2973cc5e5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f29741ba940 (LWP 13350)):
[KCrash Handler]
#6  0x00000000028e5928 in ?? ()
#7  0x00007f297245a700 in QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f297140d3e7 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#9  0x00007f297140d4af in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#10 0x00007f297140d742 in QScriptEngine::newQObject(QObject*, QScriptEngine::ValueOwnership, QFlags<QScriptEngine::QObjectWrapOption> const&) () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#11 0x00007f29738d744c in ?? () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#12 0x00007f297140da25 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#13 0x00007f2971434b43 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#14 0x00007f297143d1a5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#15 0x00007f2972454707 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f29719f4b28 in KWin::EffectsHandler::desktopPresenceChanged(KWin::EffectWindow*, int, int) () from /usr/lib/x86_64-linux-gnu/libkwineffects.so.8
#17 0x00007f29719f612c in ?? () from /usr/lib/x86_64-linux-gnu/libkwineffects.so.8
#18 0x00007f2972455569 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f2972d5fafc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007f2972d65036 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007f29724280f8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f2972429fba in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007f297247a852 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007f295c4dc65d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#25 0x00007f2972425e4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f297242e50c in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f2973f86a5e in kdemain () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#28 0x00007f2973bfd5f0 in __libc_start_main (main=0x400730, argc=3, argv=0x7ffc9d19ece8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc9d19ecd8) at libc-start.c:291
#29 0x0000000000400769 in _start ()

Possible duplicates by query: bug 364826, bug 364643, bug 364459, bug 364196, bug 363988.

Reported using DrKonqi