Application: kwin_x11 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-22-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
LAUNCHED KDE
SCREEN GOES BLACK AT 80%
LITTLE INFO IN LOGS
TRIED LIGHTDM GDM SDDM

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 0x7fdf1195a800 (LWP 12691))]

Thread 3 (Thread 0x7fdeed05c700 (LWP 12759)):
#0  0x00007fdf114388dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fdf0854debc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fdf0854e242 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fdef81b0af6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fdf08574955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fdf07bf9754 in ?? () from /usr/lib/nvidia-304/libGL.so.1
#6  0x00007fdf08a6c6aa in start_thread (arg=0x7fdeed05c700) at pthread_create.c:333
#7  0x00007fdf11443eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fdeec85b700 (LWP 12760)):
#0  0x00007fdf114388dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fdf0854debc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fdf0854dfcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fdf0854e009 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fdf08574955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fdf07bf9754 in ?? () from /usr/lib/nvidia-304/libGL.so.1
#6  0x00007fdf08a6c6aa in start_thread (arg=0x7fdeec85b700) at pthread_create.c:333
#7  0x00007fdf11443eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fdf1195a800 (LWP 12691)):
[KCrash Handler]
#6  xcb_setup_vendor_end (R=R@entry=0x0) at xproto.c:1569
#7  0x00007fdf0f73d059 in xcb_setup_pixmap_formats_iterator (R=R@entry=0x0) at xproto.c:1622
#8  0x00007fdf0f73d099 in xcb_setup_roots_iterator (R=0x0) at xproto.c:1659
#9  0x00007fdf10f5d0f8 in defaultScreen () at ../libkwineffects/kwinglobals.h:170
#10 KWin::ColorMapper::ColorMapper (this=this@entry=0x23260e0, parent=parent@entry=0x231c070) at ../workspace.cpp:82
#11 0x00007fdf10f65371 in KWin::Workspace::Workspace (this=0x231c070, restore=<optimized out>) at ../workspace.cpp:172
#12 0x00007fdf1170aaa6 in operator() (__closure=<synthetic pointer>) at ../main_x11.cpp:170
#13 call (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:494
#14 call<QtPrivate::List<>, void> (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:551
#15 QtPrivate::QFunctorSlotObject<KWin::ApplicationX11::performStartup()::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=<optimized out>, this_=<optimized out>, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobject_impl.h:192
#16 0x00007fdf0fc6035a in call (a=0x7ffee8f0b720, r=0x2305ec0, this=0x2304f90) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#17 QMetaObject::activate (sender=0x2305ec0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0) at kernel/qobject.cpp:3702
#18 0x00007fdf0fc61057 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7fdf10cd5bc0 <KSelectionOwner::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0) at kernel/qobject.cpp:3582
#19 0x00007fdf10ac50e3 in KSelectionOwner::claimedOwnership (this=<optimized out>) at moc_kselectionowner.cpp:150
#20 0x00007fdf10aa8a9b in KSelectionOwner::Private::claimSucceeded (this=0x2305400) at ../../src/kselectionowner.cpp:206
#21 0x00007fdf10aa9221 in KSelectionOwner::filterEvent (this=0x2305ec0, ev_P=<optimized out>) at ../../src/kselectionowner.cpp:424
#22 0x00007fdf0fc2c510 in QAbstractEventDispatcher::filterNativeEvent (this=this@entry=0x21ae330, eventType=..., message=message@entry=0x7fdef4001440, result=result@entry=0x7ffee8f0b8b8) at kernel/qabstracteventdispatcher.cpp:460
#23 0x00007fdefb40a02d in QXcbConnection::handleXcbEvent (this=this@entry=0x20c4960, event=event@entry=0x7fdef4001440) at qxcbconnection.cpp:863
#24 0x00007fdefb40b4bb in QXcbConnection::processXcbEvents (this=0x20c4960) at qxcbconnection.cpp:1303
#25 0x00007fdf0fc6173a in QObject::event (this=0x20c4960, e=<optimized out>) at kernel/qobject.cpp:1245
#26 0x00007fdf10539b2c in QApplicationPrivate::notify_helper (this=0x20b6100, receiver=0x20c4960, e=0x7fdef40014b0) at kernel/qapplication.cpp:3720
#27 0x00007fdf1053f000 in QApplication::notify (this=0x7ffee8f0bfa0, receiver=0x20c4960, e=0x7fdef40014b0) at kernel/qapplication.cpp:3503
#28 0x00007fdf0fc2fc2b in QCoreApplication::notifyInternal (this=0x7ffee8f0bfa0, receiver=0x20c4960, event=event@entry=0x7fdef40014b0) at kernel/qcoreapplication.cpp:935
#29 0x00007fdf0fc31c9b in sendEvent (event=0x7fdef40014b0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#30 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x20a7010) at kernel/qcoreapplication.cpp:1552
#31 0x00007fdf0fc86112 in QEventDispatcherUNIX::processEvents (this=0x21ae330, flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:579
#32 0x00007fdefb46196d in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:62
#33 0x00007fdf0fc2d3e2 in QEventLoop::exec (this=this@entry=0x7ffee8f0bec0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#34 0x00007fdf0fc3502c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#35 0x00007fdf0ff7431c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#36 0x00007fdf105357a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#37 0x00007fdf1170b8c3 in kdemain (argc=3, argv=0x7ffee8f0c0f8) at ../main_x11.cpp:294
#38 0x00007fdf1135da40 in __libc_start_main (main=0x400790 <main(int, char**)>, argc=3, argv=0x7ffee8f0c0f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffee8f0c0e8) at libc-start.c:289
#39 0x00000000004007c9 in _start ()

Reported using DrKonqi