Application that crashed: kwin
Version of the application: 4.3.2 (KDE 4.3.2)
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic x86_64
Distribution: Ubuntu 9.10

 -- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#5  QProcess::setProcessState (this=0x1db3db0, state=QProcess::NotRunning) at io/qprocess.cpp:1329
#6  0x00007fb900050b4f in QProcessPrivate::cleanup (this=0x1e64c30) at io/qprocess.cpp:455
#7  0x00007fb900055b73 in QProcessPrivate::_q_processDied (this=0x1e64c30) at io/qprocess.cpp:708
#8  0x00007fb900055c69 in QProcess::qt_metacall (this=0x1db3db0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff5c092d90) at .moc/release-shared/moc_qprocess.cpp:109
#9  0x00007fb9000c3ddc in QMetaObject::activate (sender=0x1c64810, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3113
#10 0x00007fb9000f9e9e in QSocketNotifier::activated (this=0x1db3db0, _t1=17) at .moc/release-shared/moc_qsocketnotifier.cpp:83
#11 0x00007fb9000c8773 in QSocketNotifier::event (this=0x1c64810, e=0x7fff5c0932d0) at kernel/qsocketnotifier.cpp:316
#12 0x00007fb9007b2efc in QApplicationPrivate::notify_helper (this=0x1852ae0, receiver=0x1c64810, e=0x7fff5c0932d0) at kernel/qapplication.cpp:4056
#13 0x00007fb9007ba1ce in QApplication::notify (this=0x7fff5c0935f0, receiver=0x1c64810, e=0x7fff5c0932d0) at kernel/qapplication.cpp:4021
#14 0x00007fb903922ab6 in KApplication::notify (this=0x7fff5c0935f0, receiver=0x1c64810, event=0x7fff5c0932d0) at ../../kdeui/kernel/kapplication.cpp:302
#15 0x00007fb9000aec2c in QCoreApplication::notifyInternal (this=0x7fff5c0935f0, receiver=0x1c64810, event=0x7fff5c0932d0) at kernel/qcoreapplication.cpp:610
#16 0x00007fb9000d742a in QCoreApplication::sendEvent (source=0x1856710) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#17 socketNotifierSourceDispatch (source=0x1856710) at kernel/qeventdispatcher_glib.cpp:110
#18 0x00007fb8fa865bbe in g_main_dispatch (context=0x1855520) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:1960
#19 IA__g_main_context_dispatch (context=0x1855520) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2513
#20 0x00007fb8fa869588 in g_main_context_iterate (context=0x1855520, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>)
    at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2591
#21 0x00007fb8fa8696b0 in IA__g_main_context_iteration (context=0x1855520, may_block=1) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2654
#22 0x00007fb9000d71a6 in QEventDispatcherGlib::processEvents (this=0x1838e90, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#23 0x00007fb9008474be in QGuiEventDispatcherGlib::processEvents (this=0x1db3db0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#24 0x00007fb9000ad532 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#25 0x00007fb9000ad904 in QEventLoop::exec (this=0x7fff5c093530, flags=) at kernel/qeventloop.cpp:201
#26 0x00007fb9000afab9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#27 0x00007fb9040d3094 in kdemain () from /usr/lib/libkdeinit4_kwin.so
#28 0x00007fb903d3dabd 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=0x7fff5c093ad8) at libc-start.c:220
#29 0x0000000000400679 in _start ()

Reported using DrKonqi