Application that crashed: ksysguard
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 2.6.31-15-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
This seems reproducable! Open system monitor, go to tab with the graphs, right click on network one and set "pixels per time period" to 1 (by clicking the down button 5 times). Press ok. It should crash.

 -- Backtrace:
Application: System Monitor (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  0x0609f2c9 in ?? () from /usr/lib/libkdeinit4_ksysguard.so
#7  0x06082620 in ?? () from /usr/lib/libkdeinit4_ksysguard.so
#8  0x06083696 in ?? () from /usr/lib/libkdeinit4_ksysguard.so
#9  0x00e6f263 in QMetaObject::activate (sender=0x9658da0, from_signal_index=45, to_signal_index=45, argv=0x0) at kernel/qobject.cpp:3113
#10 0x00e6fec2 in QMetaObject::activate (sender=0x9658da0, m=0x12cb144, local_signal_index=9, argv=0x0) at kernel/qobject.cpp:3187
#11 0x010844d7 in KDialog::okClicked (this=0x9658da0) at ./kdialog.moc:252
#12 0x01086de8 in KDialog::slotButtonClicked (this=0x9658da0, button=4) at ../../kdeui/dialogs/kdialog.cpp:853
#13 0x01089319 in KDialog::qt_metacall (this=0x9658da0, _c=QMetaObject::InvokeMetaMethod, _id=33, _a=0xbf915f58) at ./kdialog.moc:184
#14 0x01150c6a in KPageDialog::qt_metacall (this=0x9658da0, _c=QMetaObject::InvokeMetaMethod, _id=69, _a=0xbf915f58) at ./kpagedialog.moc:64
#15 0x0608534a in ?? () from /usr/lib/libkdeinit4_ksysguard.so
#16 0x00e6f263 in QMetaObject::activate (sender=0x9665278, from_signal_index=4, to_signal_index=4, argv=0xbf915f58) at kernel/qobject.cpp:3113
#17 0x00e6fec2 in QMetaObject::activate (sender=0x9665278, m=0xf49878, local_signal_index=0, argv=0xbf915f58) at kernel/qobject.cpp:3187
#18 0x00e71e73 in QSignalMapper::mapped (this=0x9665278, _t1=4) at .moc/release-shared/moc_qsignalmapper.cpp:95
#19 0x00e7270d in QSignalMapper::map (this=0x9665278, sender=0x96313a8) at kernel/qsignalmapper.cpp:266
#20 0x00e728ee in QSignalMapper::map (this=0x9665278) at kernel/qsignalmapper.cpp:257
#21 0x00e7312b in QSignalMapper::qt_metacall (this=0x9665278, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbf916128) at .moc/release-shared/moc_qsignalmapper.cpp:81
#22 0x00e6f263 in QMetaObject::activate (sender=0x96313a8, from_signal_index=29, to_signal_index=30, argv=0xbf916128) at kernel/qobject.cpp:3113
#23 0x00e6f6d8 in QMetaObject::activate (sender=0x96313a8, m=0x2a110a4, from_local_signal_index=2, to_local_signal_index=3, argv=0xbf916128) at kernel/qobject.cpp:3207
#24 0x0282acc1 in QAbstractButton::clicked (this=0x96313a8, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:200
#25 0x02553549 in QAbstractButtonPrivate::emitClicked (this=0x9669578) at widgets/qabstractbutton.cpp:543
#26 0x025551a4 in QAbstractButtonPrivate::click (this=0x9669578) at widgets/qabstractbutton.cpp:536
#27 0x02555431 in QAbstractButton::mouseReleaseEvent (this=0x96313a8, e=0xbf916720) at widgets/qabstractbutton.cpp:1115
#28 0x021f3012 in QWidget::event (this=0x96313a8, event=0xbf916720) at kernel/qwidget.cpp:7549
#29 0x025533ee in QAbstractButton::event (this=0x96313a8, e=0x0) at widgets/qabstractbutton.cpp:1077
#30 0x025fd66d in QPushButton::event (this=0x96313a8, e=0xbf916720) at widgets/qpushbutton.cpp:662
#31 0x0219df54 in QApplicationPrivate::notify_helper (this=0x931f630, receiver=0x96313a8, e=0xbf916720) at kernel/qapplication.cpp:4056
#32 0x021a6033 in QApplication::notify (this=0x931f570, receiver=0x96313a8, e=0xbf916720) at kernel/qapplication.cpp:3758
#33 0x0111fbfa in KApplication::notify (this=0x931f570, receiver=0x96313a8, event=0xbf916720) at ../../kdeui/kernel/kapplication.cpp:302
#34 0x00e596cb in QCoreApplication::notifyInternal (this=0x931f570, receiver=0x96313a8, event=0xbf916720) at kernel/qcoreapplication.cpp:610
#35 0x021a4f6e in QCoreApplication::sendSpontaneousEvent (receiver=0x96313a8, event=0xbf916720, alienWidget=0x96313a8, nativeWidget=0x9658da0, buttonDown=0x2a18aa0, lastMouseReceiver=...)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#36 QApplicationPrivate::sendMouseEvent (receiver=0x96313a8, event=0xbf916720, alienWidget=0x96313a8, nativeWidget=0x9658da0, buttonDown=0x2a18aa0, lastMouseReceiver=...)
    at kernel/qapplication.cpp:2924
#37 0x022137c0 in QETWidget::translateMouseEvent (this=0x9658da0, event=0xbf917d6c) at kernel/qapplication_x11.cpp:4409
#38 0x02212c4b in QApplication::x11ProcessEvent (this=0x931f570, event=0xbf917d6c) at kernel/qapplication_x11.cpp:3428
#39 0x0223f502 in x11EventSourceDispatch (s=0x93402a8, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#40 0x002a8e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#41 0x002ac720 in ?? () from /lib/libglib-2.0.so.0
#42 0x002ac853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#43 0x00e8402c in QEventDispatcherGlib::processEvents (this=0x9336568, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#44 0x0223ebe5 in QGuiEventDispatcherGlib::processEvents (this=0x9336568, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#45 0x00e57c79 in QEventLoop::processEvents (this=0xbf918064, flags=) at kernel/qeventloop.cpp:149
#46 0x00e580ca in QEventLoop::exec (this=0xbf918064, flags=...) at kernel/qeventloop.cpp:201
#47 0x00e5a53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#48 0x0219ddd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#49 0x060c1837 in kdemain () from /usr/lib/libkdeinit4_ksysguard.so
#50 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=1, envs=0x930e41b "DISPLAY=:0.0", reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x930e42c "Toshiba-R600-Kubuntu;1260496133;624591;1636_TIME52696440") at ../../kinit/kinit.cpp:677
#51 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#52 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#53 0x0804fbaf in main (argc=1, argv=0xbf918964, envp=0xbf91896c) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi