Application: kwin_x11 (5.10.3)

Qt Version: 5.9.1
Frameworks Version: 5.36.0
Operating System: Linux 4.11.9-1-ARCH x86_64
Distribution: "Arch Linux"

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

I opened the steam store and kwin crashed, probably not related though.

-- Backtrace:
Application: KWin (kwin_x11), signal: Aborted
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f2787f3c840 (LWP 20874))]

Thread 6 (Thread 0x7f27577ff700 (LWP 16140)):
#0  0x00007f2780ab81ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f2784d385ec in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f2784d30d0c in QSemaphore::acquire(int) () at /usr/lib/libQt5Core.so.5
#3  0x00007f274f3ed82c in  () at /usr/lib/qt/plugins/texttospeech/libqttexttospeech_flite.so
#4  0x00007f2784d3715b in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f2780ab2049 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f2787990f0f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f2765f5a700 (LWP 20791)):
#0  0x00007f2787986f76 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f2784f70ba3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f2784f7233f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f2784f18ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f2784d3240e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f2784d3715b in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f2780ab2049 in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f2787990f0f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f274e4f6700 (LWP 20899)):
#0  0x00007f2780ab81ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f2783e83b04 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f2783e83b49 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f2780ab2049 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f2787990f0f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f2767df2700 (LWP 20893)):
#0  0x00007f2787986f76 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f2784f70ba3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f2784f7233f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f2784f18ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f2784d3240e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f277e94f396 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f2784d3715b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f2780ab2049 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f2787990f0f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f276e04a700 (LWP 20892)):
#0  0x00007f2787986e9d in poll () at /usr/lib/libc.so.6
#1  0x00007f2786a5f8e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f2786a61679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f276f14872a in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f2784d3715b in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f2780ab2049 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f2787990f0f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f2787f3c840 (LWP 20874)):
[KCrash Handler]
#5  0x00007f27878d68c0 in raise () at /usr/lib/libc.so.6
#6  0x00007f27878d7f72 in abort () at /usr/lib/libc.so.6
#7  0x00007f2784d219a8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f2784d312fe in QThread::~QThread() () at /usr/lib/libQt5Core.so.5
#9  0x00007f2784d3135a in QThread::~QThread() () at /usr/lib/libQt5Core.so.5
#10 0x00007f2784f482cd in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#11 0x00007f2784f51f0c in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#12 0x00007f27673cc309 in KWin::X11StandalonePlatform::~X11StandalonePlatform() () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#13 0x00007f2784f482cd in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#14 0x00007f2784f51f0c in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#15 0x00007f2784f1cddc in QCoreApplication::~QCoreApplication() () at /usr/lib/libQt5Core.so.5
#16 0x00007f2785c478c9 in QApplication::~QApplication() () at /usr/lib/libQt5Widgets.so.5
#17 0x00007f2787c52743 in  () at /usr/lib/libkdeinit5_kwin_x11.so
#18 0x00007f2787c54029 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#19 0x00007f27878c34ca in __libc_start_main () at /usr/lib/libc.so.6
#20 0x000000000040069a in _start ()

Reported using DrKonqi