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:
- What I was doing when the application crashed:
I have two GPU's (2x GT 240) and three montiors, it workd fine until I enabled xinerama, I can login but kwin_x11 crashes after every login.

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".
[KCrash Handler]
#6  xcb_setup_vendor_end (R=R@entry=0x0) at xproto.c:1569
#7  0x00007fdb296c6059 in xcb_setup_pixmap_formats_iterator (R=R@entry=0x0) at xproto.c:1622
#8  0x00007fdb296c6099 in xcb_setup_roots_iterator (R=0x0) at xproto.c:1659
#9  0x00007fdb2aee60f8 in defaultScreen () at ../libkwineffects/kwinglobals.h:170
#10 KWin::ColorMapper::ColorMapper (this=this@entry=0x1b2e240, parent=parent@entry=0x1af5ae0) at ../workspace.cpp:82
#11 0x00007fdb2aeee371 in KWin::Workspace::Workspace (this=0x1af5ae0, restore=<optimized out>) at ../workspace.cpp:172
#12 0x00007fdb2b693aa6 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 0x00007fdb29be935a in call (a=0x7ffee3603370, r=0x1a74020, this=0x1a74160) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#17 QMetaObject::activate (sender=0x1a74020, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0) at kernel/qobject.cpp:3702
#18 0x00007fdb29bea057 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7fdb2ac5ebc0 <KSelectionOwner::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0) at kernel/qobject.cpp:3582
#19 0x00007fdb2aa4e0e3 in KSelectionOwner::claimedOwnership (this=<optimized out>) at moc_kselectionowner.cpp:150
#20 0x00007fdb2aa31a9b in KSelectionOwner::Private::claimSucceeded (this=0x1a7e950) at ../../src/kselectionowner.cpp:206
#21 0x00007fdb2aa32221 in KSelectionOwner::filterEvent (this=0x1a74020, ev_P=<optimized out>) at ../../src/kselectionowner.cpp:424
#22 0x00007fdb29bb5510 in QAbstractEventDispatcher::filterNativeEvent (this=this@entry=0x1a58950, eventType=..., message=message@entry=0x7fdb0c001c10, result=result@entry=0x7ffee3603508) at kernel/qabstracteventdispatcher.cpp:460
#23 0x00007fdb148d902d in QXcbConnection::handleXcbEvent (this=this@entry=0x1a1b5c0, event=event@entry=0x7fdb0c001c10) at qxcbconnection.cpp:863
#24 0x00007fdb148da4bb in QXcbConnection::processXcbEvents (this=0x1a1b5c0) at qxcbconnection.cpp:1303
#25 0x00007fdb29bea73a in QObject::event (this=0x1a1b5c0, e=<optimized out>) at kernel/qobject.cpp:1245
#26 0x00007fdb2a4c2b2c in QApplicationPrivate::notify_helper (this=0x1a0c710, receiver=0x1a1b5c0, e=0x7fdb0c002330) at kernel/qapplication.cpp:3720
#27 0x00007fdb2a4c8000 in QApplication::notify (this=0x7ffee3603bf0, receiver=0x1a1b5c0, e=0x7fdb0c002330) at kernel/qapplication.cpp:3503
#28 0x00007fdb29bb8c2b in QCoreApplication::notifyInternal (this=0x7ffee3603bf0, receiver=0x1a1b5c0, event=event@entry=0x7fdb0c002330) at kernel/qcoreapplication.cpp:935
#29 0x00007fdb29bbac9b in sendEvent (event=0x7fdb0c002330, 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=0x19fd190) at kernel/qcoreapplication.cpp:1552
#31 0x00007fdb29c0f112 in QEventDispatcherUNIX::processEvents (this=0x1a58950, flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:579
#32 0x00007fdb1493096d in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:62
#33 0x00007fdb29bb63e2 in QEventLoop::exec (this=this@entry=0x7ffee3603b10, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#34 0x00007fdb29bbe02c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#35 0x00007fdb29efd31c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#36 0x00007fdb2a4be7a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#37 0x00007fdb2b6948c3 in kdemain (argc=3, argv=0x7ffee3603d48) at ../main_x11.cpp:294
#38 0x00007fdb2b2e6a40 in __libc_start_main (main=0x400790 <main(int, char**)>, argc=3, argv=0x7ffee3603d48, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffee3603d38) at libc-start.c:289
#39 0x00000000004007c9 in _start ()

Reported using DrKonqi