Application that crashed: kontact
Version of the application: 4.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31.5-96.fc12.x86_64 x86_64
Distribution: "Fedora release 11.92 (Rawhide)"

What I was doing when the application crashed:
I use IMAP for email, contacts and calendar, and also have an google calendar syncing using gcaldaemon.

Here's the output of ~/.xsession-errors (shame on gcaldaemon, showing my full private calendar address... -> x'd out by me):

WARNING: Application calling GLX 1.3 function "glXCreatePixmap" when GLX 1.3 is not supported!  This is an application bug!
WARNING: Application calling GLX 1.3 function "glXCreatePixmap" when GLX 1.3 is not supported!  This is an application bug!
QGraphicsGridLayout::itemAt: invalid index 2
kdeinit4: preparing to launch /usr/lib64/kde4/kio_http.so
DEBUG | Processing GET method...
DEBUG | Password required!
DEBUG | Response processed with status code 401.
DEBUG | Processing GET method...
DEBUG | Calendar requested from /calendar/ical/cavXXXghk0%40group.calendar.google.com/private-XXX/basic.i
cs...
DEBUG | Loading calendar from https://www.google.com/calendar/ical/cavXXXXXghk0%40group.calendar.google.com/private-XXX/basic.ics...
DEBUG | Calendar loaded successfully (44053 bytes).
DEBUG | Response processed with status code 200.
*** KMail got signal 11 (Crashing)
KCrash: Application 'kontact' crashing...
kdeinit4: preparing to launch /usr/libexec/kde4/drkonqi


 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
82	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
The current source language is "auto; currently asm".
[KCrash Handler]
#5  0x00007fb7f32c0e08 in QWidget::setUpdatesEnabled(bool) () at kernel/qwidget.cpp:6587
#6  0x00007fb7f32bea0c in QWidget::setUpdatesEnabled(bool) () at kernel/qwidget.cpp:6587
#7  0x00007fb7f32bfb7f in QWidget::setUpdatesEnabled(bool) () at kernel/qwidget.cpp:6587
#8  0x00007fb7f32bfbde in QWidget::setUpdatesEnabled(bool) () at kernel/qwidget.cpp:6587
#9  0x00007fb7f3302376 in ?? () from /usr/lib64/libkorganizerprivate.so.4
#10 0x00007fb7f32f1e0a in CalendarView::updateView(QDate const&, QDate const&, bool) () from /usr/lib64/libkorganizerprivate.so.4
#11 0x00007fb7f32f38e1 in CalendarView::updateView() () from /usr/lib64/libkorganizerprivate.so.4
#12 0x00007fb7f3300f28 in CalendarView::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkorganizerprivate.so.4
#13 0x00007fb81c926b4c in QMetaObject::activate (sender=0x2341c90, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3112
#14 0x00007fb81f262f8a in KCal::Calendar::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkcal.so.4
#15 0x00007fb81f2c08d0 in KCal::CalendarResources::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkcal.so.4
#16 0x00007fb81c926b4c in QMetaObject::activate (sender=0x2352fa0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7fffe87074e0) at kernel/qobject.cpp:3112
#17 0x00007fb81f2b015f in KCal::ResourceCalendar::resourceChanged(KCal::ResourceCalendar*) () from /usr/lib64/libkcal.so.4
#18 0x00007fb7f20b1d06 in KCal::ResourceRemote::doLoad(bool) () from /usr/lib64/libkcal_resourceremote.so.4
#19 0x00007fb81f2bc03e in KCal::ResourceCached::load(KCal::ResourceCached::CacheAction) () from /usr/lib64/libkcal.so.4
#20 0x00007fb81f2bc566 in KCal::ResourceCached::slotReload() () from /usr/lib64/libkcal.so.4
#21 0x00007fb81f2bcf0a in KCal::ResourceCached::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkcal.so.4
#22 0x00007fb7f20b1830 in KCal::ResourceRemote::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkcal_resourceremote.so.4
#23 0x00007fb81c926b4c in QMetaObject::activate (sender=0x237c5d0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3112
#24 0x00007fb81c920b4e in QObject::event (this=0x237c5d0, e=0x7fffe8707e60) at kernel/qobject.cpp:1074
#25 0x00007fb81b6236bc in QApplicationPrivate::notify_helper (this=0xa376c0, receiver=0x237c5d0, e=0x7fffe8707e60) at kernel/qapplication.cpp:4056
#26 0x00007fb81b62a91e in QApplication::notify (this=<value optimized out>, receiver=0x237c5d0, e=0x7fffe8707e60) at kernel/qapplication.cpp:4021
#27 0x00007fb81d76f786 in KApplication::notify (this=0x7fffe87081c0, receiver=0x237c5d0, event=0x7fffe8707e60) at /usr/src/debug/kdelibs-4.3.2/kdeui/kernel/kapplication.cpp:302
#28 0x00007fb81c91190c in QCoreApplication::notifyInternal (this=0x7fffe87081c0, receiver=0x237c5d0, event=0x7fffe8707e60) at kernel/qcoreapplication.cpp:610
#29 0x00007fb81c93c382 in sendEvent (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#30 QTimerInfoList::activateTimers (event=<value optimized out>, receiver=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:572
#31 0x00007fb81c939d5d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#32 0x00007fb8167e622e in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#33 0x00007fb8167e9c18 in ?? () from /lib64/libglib-2.0.so.0
#34 0x00007fb8167e9d3a in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#35 0x00007fb81c939ca6 in QEventDispatcherGlib::processEvents (this=0x9fcbd0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#36 0x00007fb81b6b608e in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#37 0x00007fb81c910242 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#38 0x00007fb81c910614 in QEventLoop::exec (this=0x7fffe8708100, flags=) at kernel/qeventloop.cpp:201
#39 0x00007fb81c9127a9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#40 0x0000000000403d17 in _start ()

Reported using DrKonqi