Application that crashed: kontact
Version of the application: 4.3.5
KDE Version: 4.3.5 (KDE 4.3.5)
Qt Version: 4.6.2
Operating System: Linux 2.6.31-gentoo-r10 x86_64

What I was doing when the application crashed:
Apparently the way KMail manages IMAP mail leads to all sorts of trouble. Kontact crashes almost on every startup on one computer. A simple restart makes it work. On this computer, it started crashing today... without any special treatment. Start Kontact, go to Inbox... bang!

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib64/libgobject-2.0.so.0.2200.4-gdb.py", line 9, in <module>
    from gobject import register
  File "/usr/share/glib-2.0/gdb/gobject.py", line 3, in <module>
    import gdb.backtrace
ImportError: No module named backtrace
[KCrash Handler]
#5  0x00007f58b33265d4 in QMetaObject::addGuard(QObject**) () from /usr/lib64/qt4/libQtCore.so.4
#6  0x00007f58b4171485 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#7  0x00007f58b511ea16 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#8  0x00007f58b3312348 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#9  0x00007f58b417b623 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib64/qt4/libQtGui.so.4
#10 0x00007f58b41f8691 in ?? () from /usr/lib64/qt4/libQtGui.so.4
#11 0x00007f58b41f70e7 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#12 0x00007f58b4220e36 in ?? () from /usr/lib64/qt4/libQtGui.so.4
#13 0x00007f58af162293 in ?? () from /usr/lib/libglib-2.0.so.0
#14 0x00007f58af163dda in ?? () from /usr/lib/libglib-2.0.so.0
#15 0x00007f58af163f2b in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#16 0x00007f58b333ce74 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#17 0x00007f58b4220826 in ?? () from /usr/lib64/qt4/libQtGui.so.4
#18 0x00007f58b33112a4 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#19 0x00007f58b33115ef in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#20 0x00007f58b33136d8 in QCoreApplication::exec() () from /usr/lib64/qt4/libQtCore.so.4
#21 0x0000000000404c47 in _start ()

Reported using DrKonqi