Application: kwin_x11 (5.9.4)

Qt Version: 5.8.0
Frameworks Version: 5.32.0
Operating System: Linux 4.10.5-1-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
It crashed just after I started the computer, sddm auto login, recovered itself, it's the second time something like this happens recently

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f9effb2c840 (LWP 1995))]

Thread 11 (Thread 0x7f9ed37fe700 (LWP 3354)):
#0  0x0000003f8220d756 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x0000003fb1789234 in  () at /usr/lib/libQt5Script.so.5
#2  0x0000003fb1789279 in  () at /usr/lib/libQt5Script.so.5
#3  0x0000003f822072e7 in start_thread () at /usr/lib/libpthread.so.0
#4  0x0000003f81aec54f in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f9ee0a21700 (LWP 3084)):
#0  0x0000003f8220d756 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9ee363d68b in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f9ee363d3b7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x0000003f822072e7 in start_thread () at /usr/lib/libpthread.so.0
#4  0x0000003f81aec54f in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f9ee1222700 (LWP 3083)):
#0  0x0000003f8220d756 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9ee363d68b in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f9ee363d3b7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x0000003f822072e7 in start_thread () at /usr/lib/libpthread.so.0
#4  0x0000003f81aec54f in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f9ee1a23700 (LWP 3082)):
#0  0x0000003f8220d756 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9ee363d68b in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f9ee363d3b7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x0000003f822072e7 in start_thread () at /usr/lib/libpthread.so.0
#4  0x0000003f81aec54f in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f9ee2224700 (LWP 3081)):
#0  0x0000003f8220d756 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9ee363d68b in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f9ee363d3b7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x0000003f822072e7 in start_thread () at /usr/lib/libpthread.so.0
#4  0x0000003f81aec54f in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f9ee2c2a700 (LWP 3080)):
#0  0x0000003f8220d756 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9ee363d68b in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f9ee363d3b7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x0000003f822072e7 in start_thread () at /usr/lib/libpthread.so.0
#4  0x0000003f81aec54f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f9ef5170700 (LWP 3078)):
[KCrash Handler]
#6  0x0000003f901b7d70 in QLockFile::isLocked() const () at /usr/lib/libQt5Core.so.5
#7  0x0000003429c39fb2 in  () at /usr/lib/libKF5ConfigCore.so.5
#8  0x0000003429c1dbe8 in KConfig::sync() () at /usr/lib/libKF5ConfigCore.so.5
#9  0x00007f9efc2b93c4 in  () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#10 0x0000003f902b40be in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#11 0x0000003f902c0d98 in QTimer::timerEvent(QTimerEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x0000003f902b4b63 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#13 0x00007f9f06bd634c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#14 0x00007f9f06bddb61 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#15 0x0000003f90288440 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#16 0x0000003f902dbcbe in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#17 0x0000003f902d9bda in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#18 0x0000003f9028689a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#19 0x0000003f900a8a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#20 0x0000003f900ad6d8 in  () at /usr/lib/libQt5Core.so.5
#21 0x0000003f822072e7 in start_thread () at /usr/lib/libpthread.so.0
#22 0x0000003f81aec54f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f9ef61f1700 (LWP 2360)):
#0  0x0000003f81ae276b in ppoll () at /usr/lib/libc.so.6
#1  0x0000003f902d82f9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x0000003f902d996a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x0000003f9028689a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x0000003f900a8a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x0000003fa56dd025 in  () at /usr/lib/libQt5Qml.so.5
#6  0x0000003f900ad6d8 in  () at /usr/lib/libQt5Core.so.5
#7  0x0000003f822072e7 in start_thread () at /usr/lib/libpthread.so.0
#8  0x0000003f81aec54f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f9efccdb700 (LWP 2083)):
#0  0x0000003f81ae276b in ppoll () at /usr/lib/libc.so.6
#1  0x0000003f902d82f9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x0000003f902d996a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x0000003f9028689a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x0000003f900a8a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x0000003f8c616125 in  () at /usr/lib/libQt5DBus.so.5
#6  0x0000003f900ad6d8 in  () at /usr/lib/libQt5Core.so.5
#7  0x0000003f822072e7 in start_thread () at /usr/lib/libpthread.so.0
#8  0x0000003f81aec54f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f9efea1a700 (LWP 2012)):
#0  0x0000003f81ae267d in poll () at /usr/lib/libc.so.6
#1  0x0000003f8420c8e0 in  () at /usr/lib/libxcb.so.1
#2  0x0000003f8420e679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f9eff4c7239 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x0000003f900ad6d8 in  () at /usr/lib/libQt5Core.so.5
#5  0x0000003f822072e7 in start_thread () at /usr/lib/libpthread.so.0
#6  0x0000003f81aec54f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f9effb2c840 (LWP 1995)):
#0  0x0000003f8220d756 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x0000003f900ae58b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x0000003f900ad27e in QThread::wait(unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f9efc2b90be in KWin::X11StandalonePlatform::createOpenGLSafePoint(KWin::Platform::OpenGLSafePoint) () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#4  0x00007f9f07ab95d5 in KWin::Compositor::performCompositing() () at /usr/lib/libkwin.so.5
#5  0x0000003f902b4b63 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#6  0x00007f9f06bd634c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#7  0x00007f9f06bddb61 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#8  0x0000003f90288440 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#9  0x0000003f902dbcbe in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#10 0x0000003f902d9bda in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#11 0x00007f9eff527ded in  () at /usr/lib/libQt5XcbQpa.so.5
#12 0x0000003f9028689a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#13 0x0000003f9028ede4 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#14 0x00007f9f07e6d391 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#15 0x0000003f81a20511 in __libc_start_main () at /usr/lib/libc.so.6
#16 0x000000000040069a in _start ()

Reported using DrKonqi