Application: plasma-desktop (0.3)
KDE Platform Version: 4.3.95 (KDE 4.3.95 (KDE 4.4 RC2))
Qt Version: 4.6.0
Operating System: Linux 2.6.31-17-generic i686
Distribution: Ubuntu 9.10

-- Information about the crash:
I upgraded to KDE 4.4 RC2 in Kubuntu Backports from RC1.  
To reproduce the crash, I log in and click on the "cashew" in the upper right corner of the screen.  Then I select "Remove this desktop activity" from the menu.  Plasma crashed immediately.

I only have one desktop activity.  When I upgraded, the desktop no longer showed my wallpaper (the default white-drops-on-blue from an older KDE 4.something) but showed solid blue-grey instead.  I deleted the activity in the hope that Plasma would create an activity with default settings.  Perhaps the activity is corrupt?

The crash can be reproduced some of the time.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7881760 (LWP 2523))]

Thread 2 (Thread 0xab74bb70 (LWP 2524)):
#0  0x00269832 in ?? () from /lib/ld-linux.so.2
#1  0x00248e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x00dfa307 in QWaitConditionPrivate::wait (this=0x92c9db8, mutex=0x92c9db4, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#3  QWaitCondition::wait (this=0x92c9db8, mutex=0x92c9db4, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#4  0x010fc102 in QHostInfoAgent::run (this=0x92c9da8) at kernel/qhostinfo.cpp:252
#5  0x00df93ae in QThreadPrivate::start (arg=0x92c9da8) at thread/qthread_unix.cpp:244
#6  0x0024480e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x079ae8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7881760 (LWP 2523)):
[KCrash Handler]
#6  0x02d4f22a in QGraphicsItem::isPanel (this=0x8f2abb8) at graphicsview/qgraphicsitem.cpp:1626
#7  0x026f419c in QApplicationPrivate::notify_helper (this=0x8e81ea0, receiver=0x8f2abb8, e=0xbfbb2464) at kernel/qapplication.cpp:4242
#8  0x026fadf7 in QApplication::notify (this=0x8e7bd40, receiver=0x8f2abb8, e=0xbfbb2464) at kernel/qapplication.cpp:3661
#9  0x006e3a1a in KApplication::notify (this=0x8e7bd40, receiver=0x8f2abb8, event=0xbfbb2464) at ../../kdeui/kernel/kapplication.cpp:302
#10 0x00efaeab in QCoreApplication::notifyInternal (this=0x8e7bd40, receiver=0x8f2abb8, event=0xbfbb2464) at kernel/qcoreapplication.cpp:704
#11 0x0270291e in QCoreApplication::sendEvent (receiver=0x8f2abb8, event=0x8eeb560) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#12 0x02db738c in QGraphicsView::viewportEvent (this=0x92d8b70, event=0xbfbb2464) at graphicsview/qgraphicsview.cpp:2651
#13 0x02be65e5 in QAbstractScrollAreaPrivate::viewportEvent (this=0x92da828, o=0x92dc428, e=0xbfbb2464) at widgets/qabstractscrollarea_p.h:100
#14 QAbstractScrollAreaFilter::eventFilter (this=0x92da828, o=0x92dc428, e=0xbfbb2464) at widgets/qabstractscrollarea_p.h:116
#15 0x00efa14a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x8e81ea0, receiver=0x92dc428, event=0xbfbb2464) at kernel/qcoreapplication.cpp:819
#16 0x026f4179 in QApplicationPrivate::notify_helper (this=0x8e81ea0, receiver=0x92dc428, e=0xbfbb2464) at kernel/qapplication.cpp:4238
#17 0x026faeb7 in QApplication::notify (this=0x8e7bd40, receiver=0x92dc428, e=0xbfbb2464) at kernel/qapplication.cpp:4207
#18 0x006e3a1a in KApplication::notify (this=0x8e7bd40, receiver=0x92dc428, event=0xbfbb2464) at ../../kdeui/kernel/kapplication.cpp:302
#19 0x00efaeab in QCoreApplication::notifyInternal (this=0x8e7bd40, receiver=0x92dc428, event=0xbfbb2464) at kernel/qcoreapplication.cpp:704
#20 0x02751a4d in QCoreApplication::sendEvent (this=0x92d8b70, event=0xbfbb2464) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#21 QWidget::event (this=0x92d8b70, event=0xbfbb2464) at kernel/qwidget.cpp:8230
#22 0x02b4a433 in QFrame::event (this=0x92d8b70, e=0xbfbb2464) at widgets/qframe.cpp:557
#23 0x02be4707 in QAbstractScrollArea::event (this=0x92d8b70, e=0xbfbb2464) at widgets/qabstractscrollarea.cpp:985
#24 0x02dba1e6 in QGraphicsView::event (this=0x92d8b70, event=0xbfbb2464) at graphicsview/qgraphicsview.cpp:2625
#25 0x026f419c in QApplicationPrivate::notify_helper (this=0x8e81ea0, receiver=0x92d8b70, e=0xbfbb2464) at kernel/qapplication.cpp:4242
#26 0x026faeb7 in QApplication::notify (this=0x8e7bd40, receiver=0x92d8b70, e=0xbfbb2464) at kernel/qapplication.cpp:4207
#27 0x006e3a1a in KApplication::notify (this=0x8e7bd40, receiver=0x92d8b70, event=0xbfbb2464) at ../../kdeui/kernel/kapplication.cpp:302
#28 0x00efaeab in QCoreApplication::notifyInternal (this=0x8e7bd40, receiver=0x92d8b70, event=0xbfbb2464) at kernel/qcoreapplication.cpp:704
#29 0x026fe496 in QCoreApplication::sendSpontaneousEvent (act=0x92d8b70) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#30 QApplication::setActiveWindow (act=0x92d8b70) at kernel/qapplication.cpp:2441
#31 0x02782b57 in QApplication::x11ProcessEvent (this=0x8e7bd40, event=0xbfbb283c) at kernel/qapplication_x11.cpp:3420
#32 0x027b204a in x11EventSourceDispatch (s=0x8e845b0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#33 0x067e9e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#34 0x067ed730 in ?? () from /lib/libglib-2.0.so.0
#35 0x067ed863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#36 0x00f26bd5 in QEventDispatcherGlib::processEvents (this=0x8e81c90, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#37 0x027b1b75 in QGuiEventDispatcherGlib::processEvents (this=0x8e81c90, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#38 0x00ef94c9 in QEventLoop::processEvents (this=0xbfbb2b34, flags=) at kernel/qeventloop.cpp:149
#39 0x00ef991a in QEventLoop::exec (this=0xbfbb2b34, flags=...) at kernel/qeventloop.cpp:201
#40 0x00efdb0f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#41 0x026f4237 in QApplication::exec () at kernel/qapplication.cpp:3570
#42 0x0184a1ee in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#43 0x0804dff7 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x8e72ed0 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x8051429 "0") at ../../kinit/kinit.cpp:706
#44 0x0804ec15 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1198
#45 0x0804f08c in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1391
#46 0x0804fe27 in main (argc=4, argv=0xbfbb35e4, envp=0xbfbb35f8) at ../../kinit/kinit.cpp:1830

Possible duplicates by query: bug 223963, bug 222588, bug 222074, bug 221042, bug 219645.

Reported using DrKonqi