Application that crashed: kwin
Version of the application: 4.3.00 (KDE 4.3.0)
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

 -- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#5  QProcess::setProcessState (this=0x28c4970, state=QProcess::NotRunning) at io/qprocess.cpp:1329
#6  0x00007f63c4a57fcf in QProcessPrivate::cleanup (this=0x26c3340) at io/qprocess.cpp:455
#7  0x00007f63c4a5d9fb in QProcessPrivate::_q_processDied (this=0x26c3340) at io/qprocess.cpp:708
#8  0x00007f63c4a5dae1 in QProcess::qt_metacall (this=0x27f3b50, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffcf857490) at .moc/release-shared/moc_qprocess.cpp:109
#9  0x00007f63c4accea2 in QMetaObject::activate (sender=0x25be360, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x1) at kernel/qobject.cpp:3113
#10 0x00007f63c4b040fe in QSocketNotifier::activated (this=0x28c4970, _t1=14) at .moc/release-shared/moc_qsocketnotifier.cpp:83
#11 0x00007f63c4ad1a73 in QSocketNotifier::event (this=0x25be360, e=0x7fffcf857a60) at kernel/qsocketnotifier.cpp:316
#12 0x00007f63c51c0f4d in QApplicationPrivate::notify_helper (this=0x2257410, receiver=0x25be360, e=0x7fffcf857a60) at kernel/qapplication.cpp:4056
#13 0x00007f63c51c918a in QApplication::notify (this=0x7fffcf857d80, receiver=0x25be360, e=0x7fffcf857a60) at kernel/qapplication.cpp:4021
#14 0x00007f63c670071b in KApplication::notify (this=0x7fffcf857d80, receiver=0x25be360, event=0x7fffcf857a60) at /build/buildd/kde4libs-4.3.0/kdeui/kernel/kapplication.cpp:302
#15 0x00007f63c4ab76ac in QCoreApplication::notifyInternal (this=0x7fffcf857d80, receiver=0x25be360, event=0x7fffcf857a60) at kernel/qcoreapplication.cpp:610
#16 0x00007f63c4ae0d09 in socketNotifierSourceDispatch (source=0x225b060) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#17 0x00007f63bdd3320a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#18 0x00007f63bdd368e0 in ?? () from /usr/lib/libglib-2.0.so.0
#19 0x00007f63bdd36a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#20 0x00007f63c4ae0aae in QEventDispatcherGlib::processEvents (this=0x223e930, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:329
#21 0x00007f63c5259bdf in QGuiEventDispatcherGlib::processEvents (this=0x28c4970, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#22 0x00007f63c4ab5f42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -813335424}) at kernel/qeventloop.cpp:149
#23 0x00007f63c4ab6314 in QEventLoop::exec (this=0x7fffcf857cc0, flags={i = -813335344}) at kernel/qeventloop.cpp:201
#24 0x00007f63c4ab85e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#25 0x00007f63c73a70a8 in kdemain () from /usr/lib/libkdeinit4_kwin.so
#26 0x00007f63c1e765a6 in __libc_start_main (main=0x4008c0 <_start+240>, argc=1, ubp_av=0x7fffcf858268, init=0x4008f0 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fffcf858258) at libc-start.c:220
#27 0x00000000004007f9 in _start ()

Reported using DrKonqi