Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          g++ (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7) 
OS:                Linux

Qt: 4.4.0 
KDE: 4.1.60 (KDE 4.1.60 (KDE 4.2 >= 20080709)) 
 
KDE compiled today from SVN

Whenever I remove a widget and click on "Lock Widgets" plasma crashes.

Steps to reproduce:
	1. Unlock Widgets
	2. Remove "Folder View" / "Notes" / "Now Playing"
	3. Lock Widgets

Backtrace:

Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 0 (LWP 5841)]

Thread 3 (Thread 0xb2b73b90 (LWP 5853)):
#0  0xb7eeb410 in __kernel_vsyscall ()
#1  0xb68abaa5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6927e50 in QWaitConditionPrivate::wait (this=0x81ed480, time=4294967295) at /home/kpatrick/kde/src/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:88
#3  0xb692794f in QWaitCondition::wait (this=0x81df260, mutex=0x81df25c, time=4294967295) at /home/kpatrick/kde/src/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:265
#4  0xb681ddb3 in QHostInfoAgent::run (this=0x81df250) at /home/kpatrick/kde/src/qt-copy/src/network/kernel/qhostinfo.cpp:247
#5  0xb6927405 in QThreadPrivate::start (arg=0x81df250) at /home/kpatrick/kde/src/qt-copy/src/corelib/thread/qthread_unix.cpp:190
#6  0xb68a74fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb5aa1e5e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xb223db90 (LWP 5854)):
#0  0xb7eeb410 in __kernel_vsyscall ()
#1  0xb68abaa5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6927e50 in QWaitConditionPrivate::wait (this=0x814eea8, time=4294967295) at /home/kpatrick/kde/src/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:88
#3  0xb692794f in QWaitCondition::wait (this=0x814bd04, mutex=0x814bd00, time=4294967295) at /home/kpatrick/kde/src/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:265
#4  0xb2e4bfff in RenderThread::run (this=0x814bcf8) at /home/kpatrick/kde/src/KDE/kdebase/workspace/plasma/containments/desktop/renderthread.cpp:84
#5  0xb6927405 in QThreadPrivate::start (arg=0x814bcf8) at /home/kpatrick/kde/src/qt-copy/src/corelib/thread/qthread_unix.cpp:190
#6  0xb68a74fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb5aa1e5e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb48d6740 (LWP 5841)):
[KCrash Handler]
#6  0xb65bbe89 in vtable for QAction () from /home/kpatrick/qt-copy/lib/libQtGui.so.4
#7  0x0804b258 in ?? ()
#8  0xb7dd06d1 in QObject::disconnect (this=0x85ab878, receiver=0x814bc68, member=0x0) at /home/kpatrick/qt-copy/include/QtCore/qobject.h:215
#9  0xb7df247c in Plasma::ContainmentPrivate::toggleDesktopImmutability (this=0x814b9f0) at /home/kpatrick/kde/src/KDE/kdebase/workspace/libs/plasma/containment.cpp:1081
#10 0xb7df27c1 in Plasma::Containment::qt_metacall (this=0x814bc68, _c=QMetaObject::InvokeMetaMethod, _id=21, _a=0xbfb93f7c)
    at /home/kpatrick/kde/build/KDE/kdebase/workspace/libs/plasma/containment.moc:130
#11 0xb2e3b2d4 in DefaultDesktop::qt_metacall (this=0x814bc68, _c=QMetaObject::InvokeMetaMethod, _id=43, _a=0xbfb93f7c)
    at /home/kpatrick/kde/build/KDE/kdebase/workspace/plasma/containments/desktop/desktop.moc:75
#12 0xb6a30517 in QMetaObject::activate (sender=0x818cb30, from_signal_index=5, to_signal_index=6, argv=0xbfb93f7c) at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qobject.cpp:3007
#13 0xb6a30720 in QMetaObject::activate (sender=0x818cb30, m=0xb65bbe58, from_local_signal_index=1, to_local_signal_index=2, argv=0xbfb93f7c)
    at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qobject.cpp:3100
#14 0xb5ec677e in QAction::triggered (this=0x818cb30, _t1=false) at .moc/debug-shared/moc_qaction.cpp:216
#15 0xb5ec8320 in QAction::activate (this=0x818cb30, event=QAction::Trigger) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qaction.cpp:1119
#16 0xb62e36c6 in QMenuPrivate::activateAction (this=0x8155010, action=0x818cb30, action_e=QAction::Trigger, self=true) at /home/kpatrick/kde/src/qt-copy/src/gui/widgets/qmenu.cpp:1005
#17 0xb62e5ea7 in QMenu::mouseReleaseEvent (this=0xbfb94f88, e=0xbfb94748) at /home/kpatrick/kde/src/qt-copy/src/gui/widgets/qmenu.cpp:2160
#18 0xb798d6a4 in KMenu::mouseReleaseEvent (this=0xbfb94f88, e=0xbfb94748) at /home/kpatrick/kde/src/KDE/kdelibs/kdeui/widgets/kmenu.cpp:452
#19 0xb5f2bcf9 in QWidget::event (this=0xbfb94f88, event=0xbfb94748) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qwidget.cpp:6927
#20 0xb62e1310 in QMenu::event (this=0xbfb94f88, e=0xbfb94748) at /home/kpatrick/kde/src/qt-copy/src/gui/widgets/qmenu.cpp:2256
#21 0xb5ece52d in QApplicationPrivate::notify_helper (this=0x807efa0, receiver=0xbfb94f88, e=0xbfb94748) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication.cpp:3772
#22 0xb5ecf001 in QApplication::notify (this=0x80794c0, receiver=0xbfb94f88, e=0xbfb94748) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication.cpp:3501
#23 0xb78c67cd in KApplication::notify (this=0x80794c0, receiver=0xbfb94f88, event=0xbfb94748) at /home/kpatrick/kde/src/KDE/kdelibs/kdeui/kernel/kapplication.cpp:311
#24 0xb6a1b68a in QCoreApplication::notifyInternal (this=0x80794c0, receiver=0xbfb94f88, event=0xbfb94748) at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qcoreapplication.cpp:583
#25 0xb5eda379 in QCoreApplication::sendSpontaneousEvent (receiver=0xbfb94f88, event=0xbfb94748) at ../../include/QtCore/../../../../src/qt-copy/src/corelib/kernel/qcoreapplication.h:218
#26 0xb5ed2e76 in QApplicationPrivate::sendMouseEvent (receiver=0xbfb94f88, event=0xbfb94748, alienWidget=0x0, nativeWidget=0xbfb94f88, buttonDown=0xb65d9be0, lastMouseReceiver=@0xb65d9be4)
    at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication.cpp:2766
#27 0xb5f4cc18 in QETWidget::translateMouseEvent (this=0xbfb94f88, event=0xbfb94cec) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication_x11.cpp:4067
#28 0xb5f4a5ce in QApplication::x11ProcessEvent (this=0x80794c0, event=0xbfb94cec) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication_x11.cpp:3133
#29 0xb5f76c0d in x11EventSourceDispatch (s=0x8082018, callback=0, user_data=0x0) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qguieventdispatcher_glib.cpp:148
#30 0xb5753bf8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb5756e5e in ?? () from /usr/lib/libglib-2.0.so.0
#32 0xb57573ac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0xb6a4abcc in QEventDispatcherGlib::processEvents (this=0x8081bd0, flags=@0xbfb94e84) at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qeventdispatcher_glib.cpp:325
#34 0xb5f76428 in QGuiEventDispatcherGlib::processEvents (this=0x8081bd0, flags=@0xbfb94eb4) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qguieventdispatcher_glib.cpp:204
#35 0xb6a1854a in QEventLoop::processEvents (this=0xbfb94f30, flags=@0xbfb94ef4) at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qeventloop.cpp:149
#36 0xb6a18789 in QEventLoop::exec (this=0xbfb94f30, flags=@0xbfb94f38) at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qeventloop.cpp:196
#37 0xb62e619e in QMenu::exec (this=0xbfb94f88, p=@0xbfb95000, action=0x0) at /home/kpatrick/kde/src/qt-copy/src/gui/widgets/qmenu.cpp:1929
#38 0xb7df0cd6 in Plasma::Containment::contextMenuEvent (this=0x814bc68, event=0xbfb955c8) at /home/kpatrick/kde/src/KDE/kdebase/workspace/libs/plasma/containment.cpp:449
#39 0xb6480de3 in QGraphicsItem::sceneEvent (this=0x814bc70, event=0xbfb955c8) at /home/kpatrick/kde/src/qt-copy/src/gui/graphicsview/qgraphicsitem.cpp:3837
#40 0xb64b327f in QGraphicsWidget::sceneEvent (this=0x814bc68, event=0xbfb955c8) at /home/kpatrick/kde/src/qt-copy/src/gui/graphicsview/qgraphicswidget.cpp:1003
#41 0xb648b9c5 in QGraphicsScenePrivate::sendEvent (this=0x80e7f18, item=0x814bc70, event=0xbfb955c8) at /home/kpatrick/kde/src/qt-copy/src/gui/graphicsview/qgraphicsscene.cpp:1046
#42 0xb6494c4a in QGraphicsScene::contextMenuEvent (this=0x80e5220, contextMenuEvent=0xbfb955c8) at /home/kpatrick/kde/src/qt-copy/src/gui/graphicsview/qgraphicsscene.cpp:3110
#43 0xb649565f in QGraphicsScene::event (this=0x80e5220, event=0xbfb955c8) at /home/kpatrick/kde/src/qt-copy/src/gui/graphicsview/qgraphicsscene.cpp:2975
#44 0xb5ece52d in QApplicationPrivate::notify_helper (this=0x807efa0, receiver=0x80e5220, e=0xbfb955c8) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication.cpp:3772
#45 0xb5ece813 in QApplication::notify (this=0x80794c0, receiver=0x80e5220, e=0xbfb955c8) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication.cpp:3366
#46 0xb78c67cd in KApplication::notify (this=0x80794c0, receiver=0x80e5220, event=0xbfb955c8) at /home/kpatrick/kde/src/KDE/kdelibs/kdeui/kernel/kapplication.cpp:311
#47 0xb6a1b68a in QCoreApplication::notifyInternal (this=0x80794c0, receiver=0x80e5220, event=0xbfb955c8) at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qcoreapplication.cpp:583
#48 0xb6f73c0b in QCoreApplication::sendEvent (receiver=0x80e5220, event=0xbfb955c8) at ../../../../include/QtCore/../../../../src/qt-copy/src/corelib/kernel/qcoreapplication.h:215
#49 0xb64a3df0 in QGraphicsView::contextMenuEvent (this=0x8354b78, event=0xbfb95c24) at /home/kpatrick/kde/src/qt-copy/src/gui/graphicsview/qgraphicsview.cpp:2292
#50 0xb5f2c4be in QWidget::event (this=0x8354b78, event=0xbfb95c24) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qwidget.cpp:7083
#51 0xb6296a4c in QFrame::event (this=0x8354b78, e=0xbfb95c24) at /home/kpatrick/kde/src/qt-copy/src/gui/widgets/qframe.cpp:657
#52 0xb632dea1 in QAbstractScrollArea::viewportEvent (this=0x8354b78, e=0xbfb95c24) at /home/kpatrick/kde/src/qt-copy/src/gui/widgets/qabstractscrollarea.cpp:941
#53 0xb64a4198 in QGraphicsView::viewportEvent (this=0x8354b78, event=0xbfb95c24) at /home/kpatrick/kde/src/qt-copy/src/gui/graphicsview/qgraphicsview.cpp:2267
#54 0xb633098e in QAbstractScrollAreaPrivate::viewportEvent (this=0x835bc00, event=0xbfb95c24) at /home/kpatrick/kde/src/qt-copy/src/gui/widgets/qabstractscrollarea_p.h:102
#55 0xb63309c0 in QAbstractScrollAreaFilter::eventFilter (this=0x835cad0, o=0x8354f48, e=0xbfb95c24) at /home/kpatrick/kde/src/qt-copy/src/gui/widgets/qabstractscrollarea_p.h:113
#56 0xb6a19a18 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x807efa0, receiver=0x8354f48, event=0xbfb95c24)
    at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qcoreapplication.cpp:694
#57 0xb5ece507 in QApplicationPrivate::notify_helper (this=0x807efa0, receiver=0x8354f48, e=0xbfb95c24) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication.cpp:3768
#58 0xb5ecf71e in QApplication::notify (this=0x80794c0, receiver=0x8354f48, e=0xbfb95c24) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication.cpp:3586
#59 0xb78c67cd in KApplication::notify (this=0x80794c0, receiver=0x8354f48, event=0xbfb95c24) at /home/kpatrick/kde/src/KDE/kdelibs/kdeui/kernel/kapplication.cpp:311
#60 0xb6a1b68a in QCoreApplication::notifyInternal (this=0x80794c0, receiver=0x8354f48, event=0xbfb95c24) at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qcoreapplication.cpp:583
#61 0xb5eda379 in QCoreApplication::sendSpontaneousEvent (receiver=0x8354f48, event=0xbfb95c24) at ../../include/QtCore/../../../../src/qt-copy/src/corelib/kernel/qcoreapplication.h:218
#62 0xb5f4cfbd in QETWidget::translateMouseEvent (this=0x8354b78, event=0xbfb9618c) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication_x11.cpp:4139
#63 0xb5f4a5ce in QApplication::x11ProcessEvent (this=0x80794c0, event=0xbfb9618c) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication_x11.cpp:3133
#64 0xb5f76c0d in x11EventSourceDispatch (s=0x8082018, callback=0, user_data=0x0) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qguieventdispatcher_glib.cpp:148
#65 0xb5753bf8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#66 0xb5756e5e in ?? () from /usr/lib/libglib-2.0.so.0
#67 0xb57573ac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#68 0xb6a4abcc in QEventDispatcherGlib::processEvents (this=0x8081bd0, flags=@0xbfb96324) at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qeventdispatcher_glib.cpp:325
#69 0xb5f76428 in QGuiEventDispatcherGlib::processEvents (this=0x8081bd0, flags=@0xbfb96354) at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qguieventdispatcher_glib.cpp:204
#70 0xb6a1854a in QEventLoop::processEvents (this=0xbfb963d0, flags=@0xbfb96394) at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qeventloop.cpp:149
#71 0xb6a18789 in QEventLoop::exec (this=0xbfb963d0, flags=@0xbfb963d8) at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qeventloop.cpp:196
#72 0xb6a1be73 in QCoreApplication::exec () at /home/kpatrick/kde/src/qt-copy/src/corelib/kernel/qcoreapplication.cpp:845
#73 0xb5ece246 in QApplication::exec () at /home/kpatrick/kde/src/qt-copy/src/gui/kernel/qapplication.cpp:3304
#74 0xb7ecdbe9 in kdemain (argc=1, argv=0xbfb96574) at /home/kpatrick/kde/src/KDE/kdebase/workspace/plasma/plasma/main.cpp:54
#75 0x080487c6 in main (argc=-1209109656, argv=0x80e7f18) at /home/kpatrick/kde/build/KDE/kdebase/workspace/plasma/plasma/plasma-qgv_dummy.cpp:3