Application that crashed: kcmshell4
Version of the application: 
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

What I was doing when the application crashed:
Reproduceable via Go menu>Show History>Preferences>Clear History.  Clicking the button immediately causes the crash.

Duplicate of 205128, I think

 -- Backtrace:
Application: KDE Control Module (kcmshell4), signal: Segmentation fault
[KCrash Handler]
#5  QMetaObject::activate (sender=0x81, m=<value optimized out>, local_signal_index=3, argv=0x0) at kernel/qobject.cpp:3183
#6  0x00007f587659c0bd in ?? () from /usr/lib/kde4/kcm_history.so
#7  0x00007f587659c444 in ?? () from /usr/lib/kde4/kcm_history.so
#8  0x00007f5880308ddc in QMetaObject::activate (sender=0xda5a20, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7f5880388700) at kernel/qobject.cpp:3113
#9  0x00007f587fb458e7 in QAbstractButton::clicked (this=0x7f58765929c0, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:200
#10 0x00007f587f8a741b in QAbstractButtonPrivate::emitClicked (this=0xda5a50) at widgets/qabstractbutton.cpp:543
#11 0x00007f587f8a902b in QAbstractButtonPrivate::click (this=0xda5a50) at widgets/qabstractbutton.cpp:536
#12 0x00007f587f8a9275 in QAbstractButton::mouseReleaseEvent (this=0xda5a20, e=0x7fff7acc7e90) at widgets/qabstractbutton.cpp:1115
#13 0x00007f587f5929c0 in QWidget::event (this=0xda5a20, event=0x7fff7acc7e90) at kernel/qwidget.cpp:7549
#14 0x00007f587f543efc in QApplicationPrivate::notify_helper (this=0xa58a10, receiver=0xda5a20, e=0x7fff7acc7e90) at kernel/qapplication.cpp:4056
#15 0x00007f587f54b011 in QApplication::notify (this=<value optimized out>, receiver=0xda5a20, e=0x7fff7acc7e90) at kernel/qapplication.cpp:3758
#16 0x00007f5880f07ab6 in KApplication::notify (this=0x7fff7acc9e10, receiver=0xda5a20, event=0x7fff7acc7e90) at ../../kdeui/kernel/kapplication.cpp:302
#17 0x00007f58802f3c2c in QCoreApplication::notifyInternal (this=0x7fff7acc9e10, receiver=0xda5a20, event=0x7fff7acc7e90) at kernel/qcoreapplication.cpp:610
#18 0x00007f587f54a8e0 in QCoreApplication::sendSpontaneousEvent (receiver=0xda5a20, event=0x7fff7acc7e90, alienWidget=0xda5a20, nativeWidget=0xb38c50, buttonDown=<value optimized out>, 
    lastMouseReceiver=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#19 QApplicationPrivate::sendMouseEvent (receiver=0xda5a20, event=0x7fff7acc7e90, alienWidget=0xda5a20, nativeWidget=0xb38c50, buttonDown=<value optimized out>, 
    lastMouseReceiver=<value optimized out>) at kernel/qapplication.cpp:2924
#20 0x00007f587f5b0a0e in QETWidget::translateMouseEvent (this=0xb38c50, event=<value optimized out>) at kernel/qapplication_x11.cpp:4409
#21 0x00007f587f5afaa9 in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fff7acc99c0) at kernel/qapplication_x11.cpp:3550
#22 0x00007f587f5d8d0c in x11EventSourceDispatch (s=<value optimized out>, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#23 0x00007f587bdb1bbe in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#24 0x00007f587bdb5588 in ?? () from /lib/libglib-2.0.so.0
#25 0x00007f587bdb56b0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#26 0x00007f588031c1a6 in QEventDispatcherGlib::processEvents (this=0xa3fd20, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#27 0x00007f587f5d84be in QGuiEventDispatcherGlib::processEvents (this=0x7f58765929c0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#28 0x00007f58802f2532 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#29 0x00007f58802f2904 in QEventLoop::exec (this=0x7fff7acc9cf0, flags=) at kernel/qeventloop.cpp:201
#30 0x00007f587f9be9de in QDialog::exec (this=0xb38c50) at dialogs/qdialog.cpp:498
#31 0x00007f5881562058 in kdemain () from /usr/lib/libkdeinit4_kcmshell4.so
#32 0x00007f587e8a7abd 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=0x7fff7acca528) at libc-start.c:220
#33 0x0000000000400709 in _start ()

Reported using DrKonqi