Application: kwin_x11 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-12-generic x86_64
Distribution: Ubuntu Vivid Vervet (development branch)

-- Information about the crash:
- Fresh install of Kubuntu 15.04 Beta 2 (KDE + Plasma 5.2), install google chrome and chrome remote desktop.  Try to connect from another Linux PC and Kwin_x11 always crash.

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  0x00007fe6818aa059 in xcb_setup_pixmap_formats_iterator (R=R@entry=0x0) at xproto.c:1622
#8  0x00007fe6818aa099 in xcb_setup_roots_iterator (R=0x0) at xproto.c:1659
#9  0x00007fe6830c80f8 in defaultScreen () at ../libkwineffects/kwinglobals.h:170
#10 KWin::ColorMapper::ColorMapper (this=this@entry=0x250f910, parent=parent@entry=0x24fecf0) at ../workspace.cpp:82
#11 0x00007fe6830d0371 in KWin::Workspace::Workspace (this=0x24fecf0, restore=<optimized out>) at ../workspace.cpp:172
#12 0x00007fe683875aa6 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 0x00007fe681dcd35a in call (a=0x7ffe9accaeb0, r=0x2481500, this=0x2497090) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#17 QMetaObject::activate (sender=0x2481500, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0) at kernel/qobject.cpp:3702
#18 0x00007fe681dce057 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7fe682e41bc0 <KSelectionOwner::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0) at kernel/qobject.cpp:3582
#19 0x00007fe682c31843 in KSelectionOwner::claimedOwnership (this=<optimized out>) at moc_kselectionowner.cpp:150
#20 0x00007fe682c151eb in KSelectionOwner::Private::claimSucceeded (this=0x248e7b0) at ../../src/kselectionowner.cpp:206
#21 0x00007fe682c15971 in KSelectionOwner::filterEvent (this=0x2481500, ev_P=<optimized out>) at ../../src/kselectionowner.cpp:424
#22 0x00007fe681d99510 in QAbstractEventDispatcher::filterNativeEvent (this=this@entry=0x2466750, eventType=..., message=message@entry=0x7fe668001a80, result=result@entry=0x7ffe9accb048) at kernel/qabstracteventdispatcher.cpp:460
#23 0x00007fe66e97602d in QXcbConnection::handleXcbEvent (this=this@entry=0x2439830, event=event@entry=0x7fe668001a80) at qxcbconnection.cpp:863
#24 0x00007fe66e9774bb in QXcbConnection::processXcbEvents (this=0x2439830) at qxcbconnection.cpp:1303
#25 0x00007fe681dce73a in QObject::event (this=0x2439830, e=<optimized out>) at kernel/qobject.cpp:1245
#26 0x00007fe6826a6b2c in QApplicationPrivate::notify_helper (this=0x24328a0, receiver=0x2439830, e=0x7fe6680012f0) at kernel/qapplication.cpp:3720
#27 0x00007fe6826ac000 in QApplication::notify (this=0x7ffe9accb730, receiver=0x2439830, e=0x7fe6680012f0) at kernel/qapplication.cpp:3503
#28 0x00007fe681d9cc2b in QCoreApplication::notifyInternal (this=0x7ffe9accb730, receiver=0x2439830, event=event@entry=0x7fe6680012f0) at kernel/qcoreapplication.cpp:935
#29 0x00007fe681d9ec9b in sendEvent (event=0x7fe6680012f0, 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=0x24232f0) at kernel/qcoreapplication.cpp:1552
#31 0x00007fe681df3112 in QEventDispatcherUNIX::processEvents (this=0x2466750, flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:579
#32 0x00007fe66e9cd96d in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:62
#33 0x00007fe681d9a3e2 in QEventLoop::exec (this=this@entry=0x7ffe9accb650, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#34 0x00007fe681da202c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#35 0x00007fe6820e131c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#36 0x00007fe6826a27a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#37 0x00007fe6838768c3 in kdemain (argc=3, argv=0x7ffe9accb888) at ../main_x11.cpp:294
#38 0x00007fe6834c8a40 in __libc_start_main (main=0x400790 <main(int, char**)>, argc=3, argv=0x7ffe9accb888, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe9accb878) at libc-start.c:289
#39 0x00000000004007c9 in _start ()

Reported using DrKonqi