Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          g++ (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)
 
OS:                Linux

after changing font sizes in systemsettings, I ran krunner (alt+f2) then typed 'kquitapp plasma & plasma' without quotes, it killed the plasma workspace with a backtrace.

Application: Plasma Workspace (plasma), signal SIGSEGV
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[New Thread -1263028512 (LWP 7589)]
[New Thread -1301890160 (LWP 7591)]
[New Thread -1293292656 (LWP 7590)]
[Current thread is 0 (LWP 7589)]

Thread 3 (Thread -1293292656 (LWP 7590)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb68b1676 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6914a06 in QWaitCondition::wait (this=0x81bfcc0, mutex=0x81bfcbc, time=4294967295) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:88
#3  0xb6082e6d in QHostInfoAgent::run (this=0x81bfcb0) at /home/kde-devel/kdesvn/qt-copy/src/network/kernel/qhostinfo.cpp:247
#4  0xb6914327 in QThreadPrivate::start (arg=0x81bfcb0) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qthread_unix.cpp:190
#5  0xb68ad46b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb5cf36de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread -1301890160 (LWP 7591)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb68b1676 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6914a06 in QWaitCondition::wait (this=0x814c85c, mutex=0x814c858, time=4294967295) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:88
#3  0xb2ff1ec6 in RenderThread::run (this=0x814c850) at /home/kde-devel/kdesvn/kdebase/workspace/plasma/containments/desktop/renderthread.cpp:84
#4  0xb6914327 in QThreadPrivate::start (arg=0x814c850) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qthread_unix.cpp:190
#5  0xb68ad46b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb5cf36de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread -1263028512 (LWP 7589)):
[KCrash Handler]
#6  0xb69ffed7 in QObject::disconnect (sender=0x88d5b98, signal=0x89d7a18 "�\210��\a", receiver=0x814c7c0, method=0x0) at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qobject.cpp:2571
#7  0xb7e87936 in Plasma::ContainmentPrivate::toggleDesktopImmutability (this=0x814cfa8) at /home/kde-devel/kdesvn/build/qt-copy/include/QtCore/../../../../qt-copy/src/corelib/kernel/qobject.h:215
#8  0xb7e8fd06 in Plasma::Containment::qt_metacall (this=0x814c7c0, _c=QMetaObject::InvokeMetaMethod, _id=43, _a=0xbfa4b34c)
    at /home/kde-devel/kdesvn/build/kdebase/workspace/libs/plasma/containment.moc:130
#9  0xb2fe297a in DefaultDesktop::qt_metacall (this=0x814c7c0, _c=QMetaObject::InvokeMetaMethod, _id=43, _a=0xbfa4b34c)
    at /home/kde-devel/kdesvn/build/kdebase/workspace/plasma/containments/desktop/desktop.moc:75
#10 0xb69fcaea in QMetaObject::activate (sender=0x81192a8, from_signal_index=<value optimized out>, to_signal_index=6, argv=<value optimized out>)
    at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qobject.cpp:3007
#11 0xb69fcdf0 in QMetaObject::activate (sender=0x81192a8, m=0xb683a3f8, from_local_signal_index=1, to_local_signal_index=2, argv=0xbfa4b34c)
    at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qobject.cpp:3100
#12 0xb621d3c1 in QAction::triggered (this=0x81192a8, _t1=false) at .moc/release-shared/moc_qaction.cpp:216
#13 0xb621e37f in QAction::activate (this=0x81192a8, event=QAction::Trigger) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qaction.cpp:1119
#14 0xb65aca5d in QMenuPrivate::activateAction (this=0x8ad9978, action=0x81192a8, action_e=QAction::Trigger, self=true) at /home/kde-devel/kdesvn/qt-copy/src/gui/widgets/qmenu.cpp:1005
#15 0xb65af07f in QMenu::mouseReleaseEvent (this=0xbfa4c2b0, e=0xbfa4badc) at /home/kde-devel/kdesvn/qt-copy/src/gui/widgets/qmenu.cpp:2160
#16 0xb70a032c in KMenu::mouseReleaseEvent (this=0xbfa4c2b0, e=0xbfa4badc) at /home/kde-devel/kdesvn/kdelibs/kdeui/widgets/kmenu.cpp:452
#17 0xb6271cb3 in QWidget::event (this=0xbfa4c2b0, event=0xbfa4badc) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qwidget.cpp:6927
#18 0xb65aa68f in QMenu::event (this=0xbfa4c2b0, e=0xbfa4badc) at /home/kde-devel/kdesvn/qt-copy/src/gui/widgets/qmenu.cpp:2256
#19 0xb622375f in QApplicationPrivate::notify_helper (this=0x807c888, receiver=0xbfa4c2b0, e=0xbfa4badc) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication.cpp:3772
#20 0xb622a291 in QApplication::notify (this=0x8062658, receiver=0xbfa4c2b0, e=0xbfa4badc) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication.cpp:3501
#21 0xb6fc747a in KApplication::notify (this=0x8062658, receiver=0xbfa4c2b0, event=0xbfa4badc) at /home/kde-devel/kdesvn/kdelibs/kdeui/kernel/kapplication.cpp:311
#22 0xb69ec469 in QCoreApplication::notifyInternal (this=0x8062658, receiver=0xbfa4c2b0, event=0xbfa4badc) at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qcoreapplication.cpp:583
#23 0xb6229880 in QApplicationPrivate::sendMouseEvent (receiver=0xbfa4c2b0, event=0xbfa4badc, alienWidget=0x0, nativeWidget=0xbfa4c2b0, buttonDown=0xb6856b50, lastMouseReceiver=@0xb6856b54)
    at ../../include/QtCore/../../../../qt-copy/src/corelib/kernel/qcoreapplication.h:218
#24 0xb6284e89 in QETWidget::translateMouseEvent (this=0xbfa4c2b0, event=0xbfa4bf98) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication_x11.cpp:4067
#25 0xb62845c6 in QApplication::x11ProcessEvent (this=0x8062658, event=0xbfa4bf98) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication_x11.cpp:3133
#26 0xb62a96c4 in x11EventSourceDispatch (s=0x807f5e8, callback=0, user_data=0x0) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qguieventdispatcher_glib.cpp:148
#27 0xb5ab611c in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#28 0xb5ab955f in ?? () from /usr/lib/libglib-2.0.so.0
#29 0x0807e878 in ?? ()
#30 0x00000000 in ?? ()