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:
The desktop was just starting up.  I clicked on an icon in the notification area on my panel (I didn't know what it was), and got a message that KWin had crashed.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7fc98c474580 (LWP 2071))]

Thread 5 (Thread 0x7fc953fff700 (LWP 2467)):
#0  0x00007fc9855aa510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc9888d52c4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fc9888d5309 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fc9855a46da in start_thread (arg=0x7fc953fff700) at pthread_create.c:456
#4  0x00007fc98beb017f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7fc95f7ff700 (LWP 2304)):
[KCrash Handler]
#6  0x00007fc9896ae1b4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc98964acb6 in QLockFile::tryLock(int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc98b22db19 in  () at /usr/lib/x86_64-linux-gnu/libKF5ConfigCore.so.5
#9  0x00007fc98b2177c0 in KConfig::sync() () at /usr/lib/x86_64-linux-gnu/libKF5ConfigCore.so.5
#10 0x00007fc96a8d4665 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#11 0x00007fc98974781e in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007fc989753e38 in QTimer::timerEvent(QTimerEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fc989748313 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fc98a3f335c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007fc98a3fab11 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007fc98971b8a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007fc98976eeae in QTimerInfoList::activateTimers() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007fc98976cdba in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fc98971988a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fc989546fe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007fc98954bc98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007fc9855a46da in start_thread (arg=0x7fc95f7ff700) at pthread_create.c:456
#23 0x00007fc98beb017f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7fc968c42700 (LWP 2162)):
#0  0x00007fc98bea4251 in __GI_ppoll (fds=0x7fc958000ac8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fc98976b251 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fc98976cb4a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fc98971988a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc989546fe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc984311df5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007fc98954bc98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc9855a46da in start_thread (arg=0x7fc968c42700) at pthread_create.c:456
#8  0x00007fc98beb017f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7fc972843700 (LWP 2144)):
#0  0x00007fc98bea418d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc980ba8576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc980ba868c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc98976ff0f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc98971988a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc989546fe3 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc9834ea5c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fc98954bc98 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc9855a46da in start_thread (arg=0x7fc972843700) at pthread_create.c:456
#9  0x00007fc98beb017f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7fc98c474580 (LWP 2071)):
#0  0x00007fc9855aa510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc98954cb4b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fc989545a23 in QSemaphore::acquire(int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fc98974771e in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc989747e6f in QObject::destroyed(QObject*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc98974eb05 in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc983540f69 in QDBusServiceWatcher::~QDBusServiceWatcher() () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fc989745cd1 in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc98974f05f in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fc983be2813 in  () at /usr/lib/x86_64-linux-gnu/libKF5GlobalAccel.so.5
#10 0x00007fc989745cd1 in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fc98974f05f in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007fc983bd3d99 in  () at /usr/lib/x86_64-linux-gnu/libKF5GlobalAccel.so.5
#13 0x00007fc98bde2270 in __run_exit_handlers (status=1, listp=0x7fc98c1695d8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at exit.c:83
#14 0x00007fc98bde22ca in __GI_exit (status=<optimized out>) at exit.c:105
#15 0x00007fc9718a0683 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#16 0x00007fc989748359 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007fc98a3f335c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007fc98a3fab11 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007fc98971b8a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fc98971e02d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007fc98976c977 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007fc9719179fd in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#23 0x00007fc98971988a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007fc989721ffc in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007fc98c178112 in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#26 0x00007fc98bdc83f1 in __libc_start_main (main=0x55e636c2d7e0, argc=3, argv=0x7ffec35dd7a8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffec35dd798) at ../csu/libc-start.c:291
#27 0x000055e636c2d81a in _start ()

Reported using DrKonqi