Application: kwin_x11 (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.1.26-21-default x86_64
Distribution: "openSUSE Leap 42.1 (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed: resumed from the suspend second time

- Unusual behavior I noticed: there was a black screen on resume, so I have to suspend and resume again

he VGA plug from the display was not connected when first time resumed

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fe6273a2800 (LWP 1897))]

Thread 5 (Thread 0x7fe60c4f3700 (LWP 1919)):
#0  0x00007fe626d21bbd in poll () at /lib64/libc.so.6
#1  0x00007fe624665422 in  () at /usr/lib64/libxcb.so.1
#2  0x00007fe62466700f in xcb_wait_for_event () at /usr/lib64/libxcb.so.1
#3  0x00007fe60d1c63c9 in  () at /usr/lib64/libQt5XcbQpa.so.5
#4  0x00007fe62492532f in  () at /usr/lib64/libQt5Core.so.5
#5  0x00007fe6263560a4 in start_thread () at /lib64/libpthread.so.0
#6  0x00007fe626d29fed in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7fe608bd9700 (LWP 1940)):
#0  0x00007fe626d23253 in select () at /lib64/libc.so.6
#1  0x00007fe624b54179 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /usr/lib64/libQt5Core.so.5
#2  0x00007fe624b55af5 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /usr/lib64/libQt5Core.so.5
#3  0x00007fe624b55f3b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007fe624afed53 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007fe62492061a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007fe61ee22e18 in  () at /usr/lib64/libQt5Qml.so.5
#7  0x00007fe62492532f in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007fe6263560a4 in start_thread () at /lib64/libpthread.so.0
#9  0x00007fe626d29fed in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7fe5fa775700 (LWP 1946)):
#0  0x00007fe62635a03f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007fe6238a886b in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007fe6238a8899 in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007fe6263560a4 in start_thread () at /lib64/libpthread.so.0
#4  0x00007fe626d29fed in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7fe5faf7e700 (LWP 3343)):
#0  0x00007fe62635a03f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007fe62492634b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQt5Core.so.5
#2  0x00007fe61f5161cb in  () at /usr/lib64/libQt5Quick.so.5
#3  0x00007fe61f516663 in  () at /usr/lib64/libQt5Quick.so.5
#4  0x00007fe62492532f in  () at /usr/lib64/libQt5Core.so.5
#5  0x00007fe6263560a4 in start_thread () at /lib64/libpthread.so.0
#6  0x00007fe626d29fed in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7fe6273a2800 (LWP 1897)):
[KCrash Handler]
#6  0x00007fe6250791a0 in QScreen::refreshRate() const () at /usr/lib64/libQt5Gui.so.5
#7  0x00007fe61f516b1f in  () at /usr/lib64/libQt5Quick.so.5
#8  0x00007fe61f516c8f in  () at /usr/lib64/libQt5Quick.so.5
#9  0x00007fe624b30cc6 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5
#10 0x00007fe6248fe08e in QUnifiedTimer::startAnimationDriver() () at /usr/lib64/libQt5Core.so.5
#11 0x00007fe6248ff8ca in QUnifiedTimer::startTimers() () at /usr/lib64/libQt5Core.so.5
#12 0x00007fe624b31ac6 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#13 0x00007fe6257e4e7c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#14 0x00007fe6257e9cc8 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#15 0x00007fe624b00e95 in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#16 0x00007fe624b03057 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib64/libQt5Core.so.5
#17 0x00007fe624b55ec4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#18 0x00007fe60d22633d in  () at /usr/lib64/libQt5XcbQpa.so.5
#19 0x00007fe624afed53 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#20 0x00007fe624b068f6 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#21 0x00007fe626ff29e7 in kdemain () at /usr/lib64/libkdeinit5_kwin_x11.so
#22 0x00007fe626c66b05 in __libc_start_main () at /lib64/libc.so.6
#23 0x000000000040085e in _start ()

Reported using DrKonqi