Application: kwin_x11 (5.12.2)

Qt Version: 5.9.1
Frameworks Version: 5.43.0
Operating System: Linux 4.13.0-36-generic x86_64
Distribution: Ubuntu 17.10

-- Information about the crash:
I logged in to my KDE and noticed, that there is no frames around windows. I cannot move, focus them or do anything. I'm using X11 session as Xwayland doesn't work at all (it's unable to login, session immediately ends and fallbacks to login manager).

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff8076ec980 (LWP 8321))]

Thread 6 (Thread 0x7ff7cffff700 (LWP 10532)):
#0  0x00007ff80010e072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55831ae4cfb0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007ff80010e072 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55831ae4cf60, cond=0x55831ae4cf88) at pthread_cond_wait.c:502
#2  0x00007ff80010e072 in __pthread_cond_wait (cond=0x55831ae4cf88, mutex=0x55831ae4cf60) at pthread_cond_wait.c:655
#3  0x00007ff7e09b924b in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007ff7e09b9167 in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007ff8001077fc in start_thread (arg=0x7ff7cffff700) at pthread_create.c:465
#6  0x00007ff807086b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7ff7e3fff700 (LWP 10531)):
#0  0x00007ff80010e072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55831ae5c270) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007ff80010e072 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55831ae5c220, cond=0x55831ae5c248) at pthread_cond_wait.c:502
#2  0x00007ff80010e072 in __pthread_cond_wait (cond=0x55831ae5c248, mutex=0x55831ae5c220) at pthread_cond_wait.c:655
#3  0x00007ff7e09b924b in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007ff7e09b9167 in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007ff8001077fc in start_thread (arg=0x7ff7e3fff700) at pthread_create.c:465
#6  0x00007ff807086b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7ff7e35bd700 (LWP 8835)):
#0  0x00007ff80707aa4b in __GI_ppoll (fds=0x7ff7d0000d18, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007ff804490151 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ff80449186e in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ff804439e3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff8042593ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff7fec09f45 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007ff80425e29d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff8001077fc in start_thread (arg=0x7ff7e35bd700) at pthread_create.c:465
#8  0x00007ff807086b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7ff7e940b700 (LWP 8382)):
#0  0x00007ff804491757 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007ff804439e3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ff8042593ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ff7fdaeae45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#4  0x00007ff80425e29d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff8001077fc in start_thread (arg=0x7ff7e940b700) at pthread_create.c:465
#6  0x00007ff807086b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7ff7eb852700 (LWP 8363)):
#0  0x00007ff80707a951 in __GI___poll (fds=0x7ff7eb851b38, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ff805f92747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007ff805f9453a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007ff7ec2faf09 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007ff80425e29d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff8001077fc in start_thread (arg=0x7ff7eb852700) at pthread_create.c:465
#6  0x00007ff807086b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ff8076ec980 (LWP 8321)):
[KCrash Handler]
#6  0x00007ff806f628a8 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#7  0x00007ff802b29dd3 in KDecoration2::Decoration::showApplicationMenu(int) () at /usr/lib/x86_64-linux-gnu/libkdecorations2.so.5
#8  0x00007ff802b2e830 in KDecoration2::DecorationButton::Private::init() () at /usr/lib/x86_64-linux-gnu/libkdecorations2.so.5
#9  0x00007ff802b2fd71 in KDecoration2::DecorationButton::DecorationButton(KDecoration2::DecorationButtonType, QPointer<KDecoration2::Decoration> const&, QObject*) () at /usr/lib/x86_64-linux-gnu/libkdecorations2.so.5
#10 0x00007ff7e35d11db in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kdecoration2/breezedecoration.so
#11 0x00007ff7e35d195a in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kdecoration2/breezedecoration.so
#12 0x00007ff802b32aec in KDecoration2::DecorationButtonGroup::DecorationButtonGroup(KDecoration2::DecorationButtonGroup::Position, KDecoration2::Decoration*, std::function<KDecoration2::DecorationButton* (KDecoration2::DecorationButtonType, KDecoration2::Decoration*, QObject*)>) () at /usr/lib/x86_64-linux-gnu/libkdecorations2.so.5
#13 0x00007ff7e35d83b4 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kdecoration2/breezedecoration.so
#14 0x00007ff7e35d9c0a in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kdecoration2/breezedecoration.so
#15 0x00007ff806c48d5c in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#16 0x00007ff806b34141 in KWin::Client::createDecoration(QRect const&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#17 0x00007ff806b34f8d in KWin::Client::updateDecoration(bool, bool) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#18 0x00007ff806ba1f36 in KWin::Client::manage(unsigned int, bool) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#19 0x00007ff806b15787 in KWin::Workspace::createClient(unsigned int, bool) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#20 0x00007ff806b8f7d5 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#21 0x00007ff8044389cf in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007ff7ec2fc480 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#23 0x00007ff7ec2fd10c in QXcbConnection::processXcbEvents() () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#24 0x00007ff80446b452 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007ff8051b646c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007ff8051bdd34 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007ff80443bde8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007ff80443e55d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007ff804491684 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007ff7ec35d9ad in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#31 0x00007ff804439e3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007ff804442da4 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007ff80735adbb in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#34 0x00007ff806f931c1 in __libc_start_main (main=0x55831a854730, argc=3, argv=0x7ffeaeced9b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffeaeced9a8) at ../csu/libc-start.c:308
#35 0x000055831a85476a in _start ()

Reported using DrKonqi