Application: plasma-desktop (0.3)
KDE Platform Version: 4.4.2 (KDE 4.4.2)
Qt Version: 4.6.2
Operating System: Linux 2.6.31-21-generic x86_64
Distribution: Ubuntu 9.10

-- Information about the crash:
Kubuntu 9.10. Downloaded KDE 4.4.2 from http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu/.
Possible duplicate: 224279. But the difference is that I can always reproduce this bug by clicking on "Remove this Desktop Activity" in the plasma popup menu.
After the crash, all widgets on my desktop disappeared and a reboot couldn't bring them back.



The crash can be reproduced every time.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f1335fc2750 (LWP 2293))]

Thread 2 (Thread 0x7f131e3ef910 (LWP 2294)):
#0  0x00007f1332fca3c3 in poll () from /lib/libc.so.6
#1  0x00007f132f9af37c in ?? () from /lib/libglib-2.0.so.0
#2  0x00007f132f9af6c0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#3  0x00007f13345bf386 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#4  0x00007f1334594732 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#5  0x00007f1334594b0c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#6  0x00007f133449ed59 in QThread::exec() () from /usr/lib/libQtCore.so.4
#7  0x00007f1334574e88 in ?? () from /usr/lib/libQtCore.so.4
#8  0x00007f13344a1775 in ?? () from /usr/lib/libQtCore.so.4
#9  0x00007f1334212a04 in start_thread () from /lib/libpthread.so.0
#10 0x00007f1332fd680d in clone () from /lib/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f1335fc2750 (LWP 2293)):
[KCrash Handler]
#5  0x00007f1333d0d564 in QGraphicsItem::isPanel() const () from /usr/lib/libQtGui.so.4
#6  0x00007f1333d5945c in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#7  0x00007f133373412c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#8  0x00007f133373a71b in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0x00007f1334ade076 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#10 0x00007f1334595e0c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#11 0x00007f1333d706c8 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#12 0x00007f1334595227 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#13 0x00007f13337340fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#14 0x00007f133373a71b in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#15 0x00007f1334ade076 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#16 0x00007f1334595e0c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#17 0x00007f133378a5fb in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#18 0x00007f1333b308b6 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#19 0x00007f1333bbbd0b in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0x00007f133373412c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#21 0x00007f133373a71b in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x00007f1334ade076 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#23 0x00007f1334595e0c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#24 0x00007f133373dc7b in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#25 0x00007f13337b8d1e in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#26 0x00007f13337e4322 in ?? () from /usr/lib/libQtGui.so.4
#27 0x00007f132f9abbce in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#28 0x00007f132f9af598 in ?? () from /lib/libglib-2.0.so.0
#29 0x00007f132f9af6c0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#30 0x00007f13345bf333 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#31 0x00007f13337e3f0e in ?? () from /usr/lib/libQtGui.so.4
#32 0x00007f1334594732 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#33 0x00007f1334594b0c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x00007f133459884b in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#35 0x00007f1328044fb2 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#36 0x0000000000406fb8 in _start ()

Possible duplicates by query: bug 236627, bug 236559, bug 236330, bug 236209, bug 236202.

Reported using DrKonqi