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 2.6.31-14-generic x86_64
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
crash after restoring a session and quickly close ( File -> Quit ) kontact

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0x00007f2612f9cc2b in ?? () from /usr/lib/libkmailprivate.so.4
#6  0x00007f2612f9dc37 in ?? () from /usr/lib/libkmailprivate.so.4
#7  0x00007f2628ec9ddc in QMetaObject::activate (sender=0x2b11900, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7fff1c865fb8) at kernel/qobject.cpp:3113
#8  0x00007f2627322014 in KIO::ListJob::entries (this=0x2b0ea40, _t1=0x2b11900, _t2=<value optimized out>) at ./jobclasses.moc:781
#9  0x00007f26273306b7 in KIO::ListJobPrivate::slotListEntries (this=0x2b13380, list=<value optimized out>) at ../../kio/kio/job.cpp:2333
#10 0x00007f2627330a4a in KIO::ListJob::qt_metacall (this=0x2b11900, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff1c866340) at ./jobclasses.moc:767
#11 0x00007f2628ec9ddc in QMetaObject::activate (sender=0x28f3dd0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7fff1c865fb8) at kernel/qobject.cpp:3113
#12 0x00007f26273e5f55 in KIO::SlaveInterface::listEntries (this=0x2b0ea40, _t1=<value optimized out>) at ./slaveinterface.moc:179
#13 0x00007f26273e99dd in KIO::SlaveInterface::dispatch (this=0x28f3dd0, _cmd=<value optimized out>, rawdata=...) at ../../kio/kio/slaveinterface.cpp:193
#14 0x00007f26273e6333 in KIO::SlaveInterface::dispatch (this=0x28f3dd0) at ../../kio/kio/slaveinterface.cpp:91
#15 0x00007f26273d914d in KIO::Slave::gotInput (this=0x28f3dd0) at ../../kio/kio/slave.cpp:322
#16 0x00007f26273db26c in KIO::Slave::qt_metacall (this=0x28f3dd0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff1c8666d0) at ./slave.moc:76
#17 0x00007f2628ec9ddc in QMetaObject::activate (sender=0x28f5040, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x7fff1c865fb8) at kernel/qobject.cpp:3113
#18 0x00007f26272f5f57 in KIO::ConnectionPrivate::dequeue (this=0x28f4fb0) at ../../kio/kio/connection.cpp:82
#19 0x00007f26272f607d in KIO::Connection::qt_metacall (this=0x28f5040, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x230d310) at ./connection.moc:73
#20 0x00007f2628ec40f9 in QObject::event (this=0x28f5040, e=0x22193e0) at kernel/qobject.cpp:1111
#21 0x00007f26297d4efc in QApplicationPrivate::notify_helper (this=0x1aaea80, receiver=0x28f5040, e=0x22193e0) at kernel/qapplication.cpp:4056
#22 0x00007f26297dc1ce in QApplication::notify (this=0x7fff1c867090, receiver=0x28f5040, e=0x22193e0) at kernel/qapplication.cpp:4021
#23 0x00007f262a40bab6 in KApplication::notify (this=0x7fff1c867090, receiver=0x28f5040, event=0x22193e0) at ../../kdeui/kernel/kapplication.cpp:302
#24 0x00007f2628eb4c2c in QCoreApplication::notifyInternal (this=0x7fff1c867090, receiver=0x28f5040, event=0x22193e0) at kernel/qcoreapplication.cpp:610
#25 0x00007f2628eb580a in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x1a70080) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#26 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x1a70080) at kernel/qcoreapplication.cpp:1247
#27 0x00007f2628edd533 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#28 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:210
#29 0x00007f262272ebbe in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#30 0x00007f2622732588 in ?? () from /lib/libglib-2.0.so.0
#31 0x00007f26227326b0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#32 0x00007f2628edd1a6 in QEventDispatcherGlib::processEvents (this=0x1a6fcb0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#33 0x00007f26298694be in QGuiEventDispatcherGlib::processEvents (this=0x2b0ea40, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#34 0x00007f2628eb3532 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#35 0x00007f2628eb3904 in QEventLoop::exec (this=0x7fff1c866fd0, flags=) at kernel/qeventloop.cpp:201
#36 0x00007f2628eb5ab9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#37 0x0000000000403f47 in _start ()

Reported using DrKonqi