Application: kwin_x11 (5.7.0)

Qt Version: 5.6.1
Frameworks Version: 5.23.0
Operating System: Linux 4.6.4+ x86_64
Distribution: Debian GNU/Linux testing (stretch)

-- Information about the crash:
- Unusual behavior I noticed:

Every window loses decoration. It seems to happen every time this crashes

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 0x7fc363342940 (LWP 3196))]

Thread 6 (Thread 0x7fc35a156700 (LWP 10700)):
#0  0x00000034c32dff73 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00000034d70d2a1f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00000034d70d445e in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00000034d70d4972 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00000034d707fe4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00000034d6ea89e4 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00000034e38c1405 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00000034d6ead808 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00000034c3a07464 in start_thread (arg=0x7fc35a156700) at pthread_create.c:333
#9  0x00000034c32e730d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fc345878700 (LWP 3213)):
#0  0x00000034c3a0d09f in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00000034d5b7c574 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00000034d5b7c5b9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00000034c3a07464 in start_thread (arg=0x7fc345878700) at pthread_create.c:333
#4  0x00000034c32e730d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fc34cc89700 (LWP 3209)):
#0  0x00007fffa0f08a4f in clock_gettime ()
#1  0x00000034c32f3f66 in __GI___clock_gettime (clock_id=1, tp=0x7fc34cc88a10) at ../sysdeps/unix/clock_gettime.c:115
#2  0x00000034d6f596c6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00000034d70d4d59 in QTimerInfoList::updateCurrentTime() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00000034d70d415b in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00000034d70d4972 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00000034d707fe4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00000034d6ea89e4 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00000034e38c1405 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00000034d6ead808 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00000034c3a07464 in start_thread (arg=0x7fc34cc89700) at pthread_create.c:333
#11 0x00000034c32e730d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fc360aa7700 (LWP 3200)):
#0  0x00000034c32dff73 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00000034d70d2a1f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00000034d70d445e in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00000034d70d4972 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00000034d707fe4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00000034d6ea89e4 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00000034d2615515 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00000034d6ead808 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00000034c3a07464 in start_thread (arg=0x7fc360aa7700) at pthread_create.c:333
#9  0x00000034c32e730d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fc3625bc700 (LWP 3199)):
#0  0x00000034c32de19d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00000034c5a0a382 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00000034c5a0bff7 in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fc363062a89 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00000034d6ead808 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00000034c3a07464 in start_thread (arg=0x7fc3625bc700) at pthread_create.c:333
#6  0x00000034c32e730d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fc363342940 (LWP 3196)):
[KCrash Handler]
#6  0x00000034e38ad339 in QQmlBinding::write(QQmlPropertyData const&, QV4::Value const&, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00000034e38ae28a in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00000034e38b759f in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00000034e384404e in QQmlComponentPrivate::complete(QQmlEnginePrivate*, QQmlComponentPrivate::ConstructionState*) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00000034e3844117 in QQmlComponentPrivate::completeCreate() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00000034e3843f80 in QQmlComponent::create(QQmlContext*) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007fc35a47c0c7 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kdecoration2/kwin5_aurorae.so
#13 0x00000034e9bcea01 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#14 0x00000034e9ab61d9 in KWin::Client::createDecoration(QRect const&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#15 0x00000034e9ab6b93 in KWin::Client::updateDecoration(bool, bool) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#16 0x00000034e9b131a6 in KWin::Client::manage(unsigned int, bool) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#17 0x00000034e9a996af in KWin::Workspace::createClient(unsigned int, bool) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#18 0x00000034e9b00881 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#19 0x00000034d707efbf in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fc363066a05 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#21 0x00007fc363067966 in QXcbConnection::processXcbEvents() () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#22 0x00000034d70af569 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00000034d0f5cafc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00000034d0f62036 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00000034d70820f8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00000034d7083fba in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00000034d70d4852 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007fc3630d665d in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#29 0x00000034d707fe4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00000034d708850c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00000034eb409226 in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#32 0x00000034c3220730 in __libc_start_main (main=0x400730, argc=3, argv=0x7fffa0e8f2c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffa0e8f2b8) at ../csu/libc-start.c:291
#33 0x0000000000400769 in _start ()

Reported using DrKonqi