Application: kontact (4.4.6)
KDE Platform Version: 4.5.1 (KDE 4.5.1)
Qt Version: 4.7.0
Operating System: Linux 2.6.35-25-generic x86_64
Distribution: Ubuntu 10.10

-- Information about the crash:
- What I was doing when the application crashed:

In calendar view, right-clicked a to-do item and selected 'toggle to-do completion'. Kontact immediately crashed.

The crash can be reproduced every time.

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f4a27d3c780 (LWP 1991))]

Thread 2 (Thread 0x7f4a132a2700 (LWP 1992)):
#0  0x00007f4a24d6c203 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f4a1dadf009 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007f4a1dadf7b5 in g_main_loop_run () from /lib/libglib-2.0.so.0
#3  0x00007f4a139d90f4 in ?? () from /usr/lib/libgio-2.0.so.0
#4  0x00007f4a1db047e4 in ?? () from /lib/libglib-2.0.so.0
#5  0x00007f4a1fe6e971 in start_thread (arg=<value optimized out>) at pthread_create.c:304
#6  0x00007f4a24d7892d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f4a27d3c780 (LWP 1991)):
[KCrash Handler]
#6  0x00007f49f5428785 in KOEventPopupMenu::toggleTodoCompleted (this=0x1b155e0) at ../../korganizer/koeventpopupmenu.cpp:265
#7  0x00007f49f542bdb0 in KOEventPopupMenu::qt_metacall (this=0x1b155e0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffe4b92b60) at ./koeventpopupmenu.moc:140
#8  0x00007f4a2549bb27 in QMetaObject::activate (sender=0x1b27900, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0xfffffffffff98ee4) at kernel/qobject.cpp:3280
#9  0x00007f4a25e32852 in QAction::triggered (this=0x7fffe4b92a10, _t1=false) at .moc/release-shared/moc_qaction.cpp:263
#10 0x00007f4a25e33f5b in QAction::activate (this=0x1b27900, event=<value optimized out>) at kernel/qaction.cpp:1256
#11 0x00007f4a2629adc1 in QMenuPrivate::activateCausedStack (this=<value optimized out>, causedStack=..., action=0x1b27900, action_e=QAction::Trigger, self=true) at widgets/qmenu.cpp:993
#12 0x00007f4a262a0782 in QMenuPrivate::activateAction (this=0x1b16b00, action=0x1b27900, action_e=QAction::Trigger, self=<value optimized out>) at widgets/qmenu.cpp:1085
#13 0x00007f4a25e9004e in QWidget::event (this=0x1b155e0, event=0x7fffe4b93610) at kernel/qwidget.cpp:8187
#14 0x00007f4a262a290b in QMenu::event (this=0x1b155e0, e=0x7fffe4b93610) at widgets/qmenu.cpp:2410
#15 0x00007f4a25e39fdc in QApplicationPrivate::notify_helper (this=0xcbac20, receiver=0x1b155e0, e=0x7fffe4b93610) at kernel/qapplication.cpp:4396
#16 0x00007f4a25e4030e in QApplication::notify (this=0x7fffe4b94320, receiver=0x1b155e0, e=0x7fffe4b93610) at kernel/qapplication.cpp:3959
#17 0x00007f4a26b8c156 in KApplication::notify (this=0x7fffe4b94320, receiver=0x1b155e0, event=0x7fffe4b93610) at ../../kdeui/kernel/kapplication.cpp:310
#18 0x00007f4a25483cdc in QCoreApplication::notifyInternal (this=0x7fffe4b94320, receiver=0x1b155e0, event=0x7fffe4b93610) at kernel/qcoreapplication.cpp:732
#19 0x00007f4a25e3edbe in sendEvent (receiver=0x1b155e0, event=0x7fffe4b93610, alienWidget=0x0, nativeWidget=0x1b155e0, buttonDown=<value optimized out>, lastMouseReceiver=<value optimized out>, spontaneous=true) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#20 QApplicationPrivate::sendMouseEvent (receiver=0x1b155e0, event=0x7fffe4b93610, alienWidget=0x0, nativeWidget=0x1b155e0, buttonDown=<value optimized out>, lastMouseReceiver=<value optimized out>, spontaneous=true) at kernel/qapplication.cpp:3058
#21 0x00007f4a25ec27bd in QETWidget::translateMouseEvent (this=0x1b155e0, event=<value optimized out>) at kernel/qapplication_x11.cpp:4337
#22 0x00007f4a25ec0c5c in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fffe4b93f30) at kernel/qapplication_x11.cpp:3536
#23 0x00007f4a25eed0e2 in x11EventSourceDispatch (s=0xcc7410, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#24 0x00007f4a1dadb342 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0x00007f4a1dadf2a8 in ?? () from /lib/libglib-2.0.so.0
#26 0x00007f4a1dadf45c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0x00007f4a254b0193 in QEventDispatcherGlib::processEvents (this=0xc8de90, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:415
#28 0x00007f4a25eeca4e in QGuiEventDispatcherGlib::processEvents (this=0x7fffe4b92a10, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#29 0x00007f4a25482a02 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#30 0x00007f4a25482dec in QEventLoop::exec (this=0x7fffe4b94260, flags=) at kernel/qeventloop.cpp:201
#31 0x00007f4a25486ebb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#32 0x0000000000403b4e in main (argc=<value optimized out>, argv=<value optimized out>) at ../../../kontact/src/main.cpp:224

Reported using DrKonqi