#0  0x00007f6bdee219af in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f6be5d75c49 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f6be5d772ff in ?? () from /usr/lib/libxcb.so.1
#3  0x00007f6be5d77411 in xcb_wait_for_reply () from /usr/lib/libxcb.so.1
#4  0x00007f6be75e7880 in getReply (this=<optimized out>) at /home/yo/builds/kwin/src/kwin-5.2.0.1/xcbutils.h:331
#5  isNull (this=<optimized out>) at /home/yo/builds/kwin/src/kwin-5.2.0.1/xcbutils.h:262
#6  KWin::readWindowProperty (win=31457303, atom=485, type=6, format=23380736) at /home/yo/builds/kwin/src/kwin-5.2.0.1/effects.cpp:171
#7  0x00007f6be75ea850 in KWin::EffectWindowImpl::readProperty (this=<optimized out>, atom=<optimized out>, type=<optimized out>, format=<optimized out>) at /home/yo/builds/kwin/src/kwin-5.2.0.1/effects.cpp:1567
#8  0x00007f6be5349b63 in KWin::BlurEffect::updateBlurRegion (this=0x23a6780, w=0x2830c30) at /home/yo/builds/kwin/src/kwin-5.2.0.1/effects/blur/blur.cpp:100
#9  0x00007f6be5349cf5 in KWin::BlurEffect::slotWindowAdded (this=<optimized out>, w=<optimized out>) at /home/yo/builds/kwin/src/kwin-5.2.0.1/effects/blur/blur.cpp:123
#10 0x00007f6be53e1f30 in KWin::BlurEffect::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at /home/yo/builds/kwin/src/build/effects/moc_blur.cpp:90
#11 0x00007f6be624a339 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#12 0x00007f6be584b332 in KWin::EffectsHandler::windowAdded (this=<optimized out>, _t1=0x2830c30) at /home/yo/builds/kwin/src/build/libkwineffects/moc_kwineffects.cpp:1195
#13 0x00007f6be6249cca in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#14 0x00007f6be766e842 in KWin::Toplevel::windowShown (this=this@entry=0x267fb10, _t1=_t1@entry=0x267fb10) at /home/yo/builds/kwin/src/build/moc_toplevel.cpp:656
#15 0x00007f6be75ae03f in KWin::Toplevel::setReadyForPainting (this=0x267fb10) at /home/yo/builds/kwin/src/kwin-5.2.0.1/toplevel.cpp:245
#16 0x00007f6be6249cca in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#17 0x00007f6be62580a8 in QTimer::timerEvent(QTimerEvent*) () from /usr/lib/libQt5Core.so.5
#18 0x00007f6be624b473 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#19 0x00007f6be6af8d8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#20 0x00007f6be6afe370 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#21 0x00007f6be621aa9b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#22 0x00007f6be6270f6d in QTimerInfoList::activateTimers() () from /usr/lib/libQt5Core.so.5
#23 0x00007f6be626f703 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#24 0x00007f6bd18b84ad in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#25 0x00007f6be6218532 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#26 0x00007f6be621ff0c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#27 0x00007f6be7cc49fb in kdemain (argc=1, argv=0x7fffb33656c8) at /home/yo/builds/kwin/src/kwin-5.2.0.1/main_x11.cpp:294
#28 0x00007f6be793d800 in __libc_start_main () from /usr/lib/libc.so.6
#29 0x00000000004007d9 in _start ()
A debugging session is active.

	Inferior 1 [process 773] will be detached.

Quit anyway? (y or n) Detaching from program: /usr/bin/kwin_x11, process 773