Application: kwin_x11 (5.12.5)

Qt Version: 5.11.0
Frameworks Version: 5.46.0
Operating System: Linux 4.4.0-127-lowlatency x86_64
Distribution: KDE neon User Edition 5.12

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

Kwin crashes at login after updating KDE Neon and then rebooting.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f589baf0940 (LWP 25397))]

Thread 2 (Thread 0x7f587615d700 (LWP 25403)):
#0  0x00007f589b512811 in __GI_ppoll (fds=0x7f587000f4f8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:50
#1  0x00007f58988d3651 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f58988d4ce2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f589887f1ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f58986b45e4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5892100f35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007f58986bf727 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f589457a6ba in start_thread (arg=0x7f587615d700) at pthread_create.c:333
#8  0x00007f589b51e41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f589baf0940 (LWP 25397)):
[KCrash Handler]
#6  0x00007f589b44c428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
#7  0x00007f589b44e02a in __GI_abort () at abort.c:89
#8  0x00007f589869190d in QMessageLogger::fatal(char const*, ...) const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f58988aaadd in QObjectPrivate::QObjectPrivate(int) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f58931a7e34 in QQmlEnginePrivate::QQmlEnginePrivate(QQmlEngine*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007f58931aaeb2 in QQmlEngine::QQmlEngine(QObject*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007f589b0d1943 in KWin::Scripting::Scripting(QObject*) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007f589b0d1a61 in KWin::Scripting::create(QObject*) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#14 0x00007f589afcaf8b in KWin::Workspace::init() () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#15 0x00007f589afcb890 in KWin::Workspace::Workspace(QString const&) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#16 0x00007f589b02fd14 in KWin::Application::createWorkspace() () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#17 0x00007f589b7e7e98 in ?? () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#18 0x00007f58988adeb6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f589b7e81e8 in ?? () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#20 0x00007f58988adeb6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f5899f7dfb8 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5WindowSystem.so.5
#22 0x00007f5899f7e711 in KSelectionOwner::filterEvent(void*) () from /usr/lib/x86_64-linux-gnu/libKF5WindowSystem.so.5
#23 0x00007f589887dd9f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007f58816d01c4 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#25 0x00007f58816d0eeb in QXcbConnection::processXcbEvents() () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#26 0x00007f58988aebc9 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f589964a29c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007f5899651917 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007f5898880e38 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007f5898883a3e in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007f58988d4b07 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f5881754f1d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#33 0x00007f589887f1ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007f58988882d4 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#35 0x00007f589b7ea1f9 in kdemain () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#36 0x00007f589b437830 in __libc_start_main (main=0x4006b0, argc=3, argv=0x7fffd4d55348, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffd4d55338) at ../csu/libc-start.c:291
#37 0x00000000004006e9 in _start ()

Possible duplicates by query: bug 392092, bug 389875, bug 389801, bug 388864, bug 384983.

Reported using DrKonqi