Application that crashed: kontact
Version of the application: 4.3.0
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I was emptying the trash folders and Kontact crashed. Sync was happening in the background.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0xb11567fd in KMFolderCachedImap::findByUID (this=0x9f492e0, uid=4380) at /build/buildd/kdepim-4.3.0/kmail/kmfoldercachedimap.cpp:691
#7  0xb116db6f in KMFolderCachedImap::slotGetMessagesData (this=0x9f492e0, job=0xaff4cd0, data=@0xbfd2fcd4) at /build/buildd/kdepim-4.3.0/kmail/kmfoldercachedimap.cpp:1862
#8  0xb117113e in KMFolderCachedImap::qt_metacall (this=0x9f492e0, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0xbfd2fa28)
    at /build/buildd/kdepim-4.3.0/obj-i486-linux-gnu/kmail/kmfoldercachedimap.moc:201
#9  0xb5ca81b8 in QMetaObject::activate (sender=0xaff4cd0, from_signal_index=40, to_signal_index=40, argv=0xbfd2fa28) at kernel/qobject.cpp:3113
#10 0xb5ca8e42 in QMetaObject::activate (sender=0xaff4cd0, m=0xb7170330, local_signal_index=0, argv=0xbfd2fa28) at kernel/qobject.cpp:3187
#11 0xb6fbf489 in KIO::TransferJob::data (this=0xaff4cd0, _t1=0xaff4cd0, _t2=@0xbfd2fcd4) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/jobclasses.moc:364
#12 0xb6fbfd92 in KIO::TransferJob::slotData (this=0xaff4cd0, _data=@0xbfd2fcd4) at /build/buildd/kde4libs-4.3.0/kio/kio/job.cpp:903
#13 0xb6fc6af5 in KIO::TransferJob::qt_metacall (this=0xaff4cd0, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfd2fb4c) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/jobclasses.moc:344
#14 0xb5ca81b8 in QMetaObject::activate (sender=0x9686d08, from_signal_index=4, to_signal_index=4, argv=0xbfd2fb4c) at kernel/qobject.cpp:3113
#15 0xb5ca8e42 in QMetaObject::activate (sender=0x9686d08, m=0xb7172f44, local_signal_index=0, argv=0xbfd2fb4c) at kernel/qobject.cpp:3187
#16 0xb708fd33 in KIO::SlaveInterface::data (this=0x9686d08, _t1=@0xbfd2fcd4) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/slaveinterface.moc:140
#17 0xb7093a7c in KIO::SlaveInterface::dispatch (this=0x9686d08, _cmd=100, rawdata=@0xbfd2fcd4) at /build/buildd/kde4libs-4.3.0/kio/kio/slaveinterface.cpp:163
#18 0xb70900f7 in KIO::SlaveInterface::dispatch (this=0x9686d08) at /build/buildd/kde4libs-4.3.0/kio/kio/slaveinterface.cpp:91
#19 0xb7081e6d in KIO::Slave::gotInput (this=0x9686d08) at /build/buildd/kde4libs-4.3.0/kio/kio/slave.cpp:322
#20 0xb7084303 in KIO::Slave::qt_metacall (this=0x9686d08, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfd2fde8) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/slave.moc:76
#21 0xb5ca81b8 in QMetaObject::activate (sender=0xaa4b6f0, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#22 0xb5ca8e42 in QMetaObject::activate (sender=0xaa4b6f0, m=0xb716f880, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#23 0xb6f8e1d7 in KIO::Connection::readyRead (this=0xaa4b6f0) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/connection.moc:86
#24 0xb6f8fb43 in KIO::ConnectionPrivate::dequeue (this=0xab36f38) at /build/buildd/kde4libs-4.3.0/kio/kio/connection.cpp:82
#25 0xb6f8ff26 in KIO::Connection::qt_metacall (this=0xaa4b6f0, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xac30060) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/connection.moc:73
#26 0xb5ca18cb in QMetaCallEvent::placeMetaCall (this=0xbb5f718, object=0xaa4b6f0) at kernel/qobject.cpp:477
#27 0xb5ca33b0 in QObject::event (this=0xaa4b6f0, e=0xbb5f718) at kernel/qobject.cpp:1111
#28 0xb6153d3c in QApplicationPrivate::notify_helper (this=0x9567590, receiver=0xaa4b6f0, e=0xbb5f718) at kernel/qapplication.cpp:4056
#29 0xb615c03e in QApplication::notify (this=0xbfd305a8, receiver=0xaa4b6f0, e=0xbb5f718) at kernel/qapplication.cpp:3603
#30 0xb6d4d5cd in KApplication::notify (this=0xbfd305a8, receiver=0xaa4b6f0, event=0xbb5f718) at /build/buildd/kde4libs-4.3.0/kdeui/kernel/kapplication.cpp:302
#31 0xb5c92bcb in QCoreApplication::notifyInternal (this=0xbfd305a8, receiver=0xaa4b6f0, event=0xbb5f718) at kernel/qcoreapplication.cpp:610
#32 0xb5c93825 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x953a440) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#33 0xb5c93a1d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#34 0xb5cbe6af in postEventSourceDispatch (s=0x955b920) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#35 0xb4d64b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#36 0xb4d680eb in ?? () from /usr/lib/libglib-2.0.so.0
#37 0xb4d68268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#38 0xb5cbe2f8 in QEventDispatcherGlib::processEvents (this=0x953a028, flags={i = -1076689800}) at kernel/qeventdispatcher_glib.cpp:327
#39 0xb61f5a75 in QGuiEventDispatcherGlib::processEvents (this=0x953a028, flags={i = -1076689752}) at kernel/qguieventdispatcher_glib.cpp:202
#40 0xb5c911fa in QEventLoop::processEvents (this=0xbfd30520, flags={i = -1076689688}) at kernel/qeventloop.cpp:149
#41 0xb5c91642 in QEventLoop::exec (this=0xbfd30520, flags={i = -1076689624}) at kernel/qeventloop.cpp:201
#42 0xb5c93ae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#43 0xb6153bb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#44 0x0804bfef in main (argc=1, argv=0xbfd308a4) at /build/buildd/kdepim-4.3.0/kontact/src/main.cpp:218

Reported using DrKonqi