Application: kwin (4.4.2 (KDE 4.4.2))
KDE Platform Version: 4.4.2 (KDE 4.4.2)
Qt Version: 4.6.2
Operating System: Linux 2.6.32-24-generic x86_64
Distribution: Ubuntu 10.04.1 LTS

-- Information about the crash:
After applying desktop effects changes, kwin always crash.
info:
I'm using Intel the i5 GPU with the intel xorg driver. Before to be able to activate compositing on KDE I had first to edit ~/.kde/share/config/kwinrc and set CheckIsSafe=true.

The crash can be reproduced every time.

 -- Backtrace:
Application: KWin (kwin), signal: Aborted
[Current thread is 1 (Thread 0x7f987f2da780 (LWP 9288))]

Thread 2 (Thread 0x7f9860a90710 (LWP 9292)):
#0  0x00007f987eb5bf83 in *__GI___poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f98751854a9 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007f98751858fc in g_main_context_iteration () from /lib/libglib-2.0.so.0
#3  0x00007f987aa17566 in QEventDispatcherGlib::processEvents (this=0xf76580, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:414
#4  0x00007f987a9ec992 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#5  0x00007f987a9ecd6c in QEventLoop::exec (this=0x7f9860a8fd90, flags=) at kernel/qeventloop.cpp:201
#6  0x00007f987a8f6d59 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:487
#7  0x00007f987a9cd178 in QInotifyFileSystemWatcherEngine::run (this=0xf63080) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f987a8f9775 in QThreadPrivate::start (arg=0xf63080) at thread/qthread_unix.cpp:248
#9  0x00007f987a6699ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#10 0x00007f987eb686fd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f987f2da780 (LWP 9288)):
[KCrash Handler]
#5  0x00007f987eab5a75 in *__GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#6  0x00007f987eab95c0 in *__GI_abort () at abort.c:92
#7  0x00007f987eaae941 in *__GI___assert_fail (assertion=0x7f987d0103e8 "dpy->xcb->reply_data != ((void *)0)", file=<value optimized out>, line=657, function=0x7f987d010640 "_XRead") at assert.c:81
#8  0x00007f987cf9a01e in _XRead (dpy=0xb15330, data=<value optimized out>, size=40370196) at ../../src/xcb_io.c:657
#9  0x00007f987cb0b5b2 in __glXReadReply (dpy=0xb15330, size=4, dest=0xd3f6ec, reply_is_always_array=1 '\001') at indirect.c:81
#10 0x00007f987cb0d5fc in __indirect_glGenTextures (n=1, textures=0xd3f6ec) at indirect.c:5258
#11 0x00007f987d6d588e in KWin::GLTexture::load (this=0xd3f6e0, image=<value optimized out>, target=3553) at ../../../kwin/lib/kwinglutils.cpp:440
#12 0x00007f986c3c75dc in KWin::CubeEffect::loadConfig (this=0xd77f30, config=<value optimized out>) at ../../../kwin/effects/cube/cube.cpp:196
#13 0x00007f986c3c7648 in KWin::CubeEffect::reconfigure (this=0xd77f30) at ../../../kwin/effects/cube/cube.cpp:110
#14 0x00007f987eed0056 in KWin::EffectsHandlerImpl::reconfigure (this=<value optimized out>) at ../../kwin/effects.cpp:103
#15 0x00007f987ee37370 in KWin::Workspace::slotReconfigure (this=0xca5c40) at ../../kwin/workspace.cpp:1122
#16 0x00007f987ee38171 in KWin::Workspace::qt_metacall (this=0xca5c40, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7ffff6b60cc0) at ./workspace.moc:498
#17 0x00007f987aa00e3f in QMetaObject::activate (sender=0xca5f40, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0xffffffffffffffff) at kernel/qobject.cpp:3293
#18 0x00007f987a9fda63 in QObject::event (this=0xca5f40, e=0x7ffff6b61410) at kernel/qobject.cpp:1212
#19 0x00007f987b13a22c in QApplicationPrivate::notify_helper (this=0xaf3b10, receiver=0xca5f40, e=0x7ffff6b61410) at kernel/qapplication.cpp:4300
#20 0x00007f987b1406fb in QApplication::notify (this=0x7ffff6b61770, receiver=0xca5f40, e=0x7ffff6b61410) at kernel/qapplication.cpp:4183
#21 0x00007f987e66c526 in KApplication::notify (this=0x7ffff6b61770, receiver=0xca5f40, event=0x7ffff6b61410) at ../../kdeui/kernel/kapplication.cpp:302
#22 0x00007f987a9ee06c in QCoreApplication::notifyInternal (this=0x7ffff6b61770, receiver=0xca5f40, event=0x7ffff6b61410) at kernel/qcoreapplication.cpp:704
#23 0x00007f987aa1ad42 in QCoreApplication::sendEvent (this=0xaf7810) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#24 QTimerInfoList::activateTimers (this=0xaf7810) at kernel/qeventdispatcher_unix.cpp:603
#25 0x00007f987aa17848 in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#26 idleTimerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#27 0x00007f98751818c2 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#28 0x00007f9875185748 in ?? () from /lib/libglib-2.0.so.0
#29 0x00007f98751858fc in g_main_context_iteration () from /lib/libglib-2.0.so.0
#30 0x00007f987aa17513 in QEventDispatcherGlib::processEvents (this=0xada5b0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#31 0x00007f987b1ea46e in QGuiEventDispatcherGlib::processEvents (this=0x2448, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#32 0x00007f987a9ec992 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#33 0x00007f987a9ecd6c in QEventLoop::exec (this=0x7ffff6b616b0, flags=) at kernel/qeventloop.cpp:201
#34 0x00007f987a9f0aab in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#35 0x00007f987ee547be in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../kwin/main.cpp:526
#36 0x00007f987eaa0c4d in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, 
    rtld_fini=<value optimized out>, stack_end=0x7ffff6b61c78) at libc-start.c:226
#37 0x00000000004006b9 in _start ()

Reported using DrKonqi