https://bugs.kde.org/show_bug.cgi?id=370439

            Bug ID: 370439
           Summary: KWin and plasma desktop are crashing after updating Qt
           Product: kwin
           Version: 5.8.0
          Platform: Compiled Sources
                OS: Linux
            Status: UNCONFIRMED
          Keywords: drkonqi
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: artic...@ua.fm

Application: kwin_x11 (5.8.0)
 (Compiled from sources)
Qt Version: 5.6.1
Frameworks Version: 5.27.0
Operating System: Linux 4.5.0-aufs-r1 x86_64
Distribution (Platform): Gentoo Packages

-- Information about the crash:
- What I was doing when the application crashed:
Updated the major version of Qt from 5.5.1 to 5.6.1
Was pressing Alt+Tab to switch windows in an emergency session.

- Unusual behavior I noticed:
Screen flickering after login, black screen, no panel. Alt+Tab does not show
window list, causes unusual flickering and then crashes.
KDE is completely broken.

- Custom settings of the application:

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 0x7f7f047367c0 (LWP 6036))]

Thread 5 (Thread 0x7f7e52f63700 (LWP 6056)):
#0  0x00007f7f042d310f in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1  0x00007f7edd4114d3 in ?? () from /usr/lib64/dri/r600_dri.so
#2  0x00007f7edd410bf7 in ?? () from /usr/lib64/dri/r600_dri.so
#3  0x00007f7f042cd484 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f7f04014e7d in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f7edffdf700 (LWP 6044)):
#0  0x00007f7f042d310f in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1  0x00007f7f0110cdf4 in ?? () from /usr/lib64/libQt5Script.so.5
#2  0x00007f7f0110ce39 in ?? () from /usr/lib64/libQt5Script.so.5
#3  0x00007f7f042cd484 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f7f04014e7d in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f7eed065700 (LWP 6043)):
#0  0x00007f7f0400dad3 in select () from /lib64/libc.so.6
#1  0x00007f7f01f53dcf in qt_safe_select(int, fd_set*, fd_set*, fd_set*,
timespec const*) () from /usr/lib64/libQt5Core.so.5
#2  0x00007f7f01f5547e in
QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>,
timespec*) () from /usr/lib64/libQt5Core.so.5
#3  0x00007f7f01f55992 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib64/libQt5Core.so.5
#4  0x00007f7f01f07f4a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib64/libQt5Core.so.5
#5  0x00007f7f01d68ae4 in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f7efcf537a5 in ?? () from /usr/lib64/libQt5Qml.so.5
#7  0x00007f7f01d6cf1c in ?? () from /usr/lib64/libQt5Core.so.5
#8  0x00007f7f042cd484 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f7f04014e7d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f7eee5d9700 (LWP 6038)):
#0  0x00007f7f0400dad3 in select () from /lib64/libc.so.6
#1  0x00007f7f01f53dcf in qt_safe_select(int, fd_set*, fd_set*, fd_set*,
timespec const*) () from /usr/lib64/libQt5Core.so.5
#2  0x00007f7f01f5547e in
QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>,
timespec*) () from /usr/lib64/libQt5Core.so.5
#3  0x00007f7f01f55992 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib64/libQt5Core.so.5
#4  0x00007f7f01f07f4a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib64/libQt5Core.so.5
#5  0x00007f7f01d68ae4 in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f7f0484d5c5 in ?? () from /usr/lib64/libQt5DBus.so.5
#7  0x00007f7f01d6cf1c in ?? () from /usr/lib64/libQt5Core.so.5
#8  0x00007f7f042cd484 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f7f04014e7d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f7f047367c0 (LWP 6036)):
[KCrash Handler]
#6  0x00007f7efd3eece0 in QSGNode::setFlag(QSGNode::Flag, bool) () from
/usr/lib64/libQt5Quick.so.5
#7  0x00007f7efd448b60 in ?? () from /usr/lib64/libQt5Quick.so.5
#8  0x00007f7efd4491fa in QQuickWindowPrivate::updateDirtyNode(QQuickItem*) ()
from /usr/lib64/libQt5Quick.so.5
#9  0x00007f7efd449ccb in QQuickWindowPrivate::updateDirtyNodes() () from
/usr/lib64/libQt5Quick.so.5
#10 0x00007f7efd44ad30 in QQuickWindowPrivate::syncSceneGraph() () from
/usr/lib64/libQt5Quick.so.5
#11 0x00007f7efd418d78 in ?? () from /usr/lib64/libQt5Quick.so.5
#12 0x00007f7efd41a478 in ?? () from /usr/lib64/libQt5Quick.so.5
#13 0x00007f7f0224ac65 in QWindow::event(QEvent*) () from
/usr/lib64/libQt5Gui.so.5
#14 0x00007f7efd454365 in QQuickWindow::event(QEvent*) () from
/usr/lib64/libQt5Quick.so.5
#15 0x00007f7eded9d7fb in PlasmaQuick::Dialog::event(QEvent*) () from
/usr/lib64/libKF5PlasmaQuick.so.5
#16 0x00007f7f02791ffc in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib64/libQt5Widgets.so.5
#17 0x00007f7f02797556 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#18 0x00007f7f01f090da in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib64/libQt5Core.so.5
#19 0x00007f7f022407ad in
QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*)
() from /usr/lib64/libQt5Gui.so.5
#20 0x00007f7f0224141d in
QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)
() from /usr/lib64/libQt5Gui.so.5
#21 0x00007f7f02221f4b in
QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
() from /usr/lib64/libQt5Gui.so.5
#22 0x00007f7ef03468c6 in ?? () from /usr/lib64/libQt5XcbQpa.so.5
#23 0x00007f7f01f07f4a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib64/libQt5Core.so.5
#24 0x00007f7f01f0f90c in QCoreApplication::exec() () from
/usr/lib64/libQt5Core.so.5
#25 0x00007f7f044eb286 in kdemain () from /usr/lib64/libkdeinit5_kwin_x11.so
#26 0x00007f7f03f4d710 in __libc_start_main () from /lib64/libc.so.6
#27 0x0000000000400809 in _start ()

Reported using DrKonqi

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