Application that crashed: kontact
Version of the application: 4.3.1
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.30-2-amd64 x86_64
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
I am able to reproduce this crash all the time. If the address is not in the "recent address sent to", kmail crashes. The completion order in my settings are: IO??? (I forgot what is called), the default address book and LDAP address book. Normally the autocomplete works fine but for some addresses it crashes kmail. Weird.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0x00007f13a409f52f in KPIM::AddresseeLineEdit::slotLDAPSearchData(QList<KPIM::LdapResult> const&) () from /usr/lib/libkdepim.so.4
#6  0x00007f13a40a051c in KPIM::AddresseeLineEdit::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdepim.so.4
#7  0x00007f138d0683ed in ?? () from /usr/lib/libkmailprivate.so.4
#8  0x00007f138d0d7b7d in ?? () from /usr/lib/libkmailprivate.so.4
#9  0x00007f13a3274df2 in QMetaObject::activate (sender=0x3f0cea0, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x0) at kernel/qobject.cpp:3112
#10 0x00007f13a40a3275 in KPIM::LdapSearch::searchData(QList<KPIM::LdapResult> const&) () from /usr/lib/libkdepim.so.4
#11 0x00007f13a40a63e1 in KPIM::LdapSearch::slotDataTimer() () from /usr/lib/libkdepim.so.4
#12 0x00007f13a40a6465 in KPIM::LdapSearch::finish() () from /usr/lib/libkdepim.so.4
#13 0x00007f13a40a8d88 in KPIM::LdapSearch::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdepim.so.4
#14 0x00007f13a3274df2 in QMetaObject::activate (sender=0x3efdc00, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#15 0x00007f13a40a3969 in KPIM::LdapClient::slotDone() () from /usr/lib/libkdepim.so.4
#16 0x00007f13a40a94d8 in KPIM::LdapClient::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdepim.so.4
#17 0x00007f13a3274df2 in QMetaObject::activate (sender=0x3e82b70, from_signal_index=<value optimized out>, to_signal_index=7, argv=0x0) at kernel/qobject.cpp:3112
#18 0x00007f13a364ce52 in KJob::result (this=0x406dbe0, _t1=0x3e82b70) at ./kjob.moc:188
#19 0x00007f13a364d1cf in KJob::emitResult (this=0x3e82b70) at ../../kdecore/jobs/kjob.cpp:304
#20 0x00007f13a0ad3ec0 in KIO::SimpleJob::slotFinished (this=0x3e82b70) at ../../kio/kio/job.cpp:477
#21 0x00007f13a0ad4383 in KIO::TransferJob::slotFinished (this=0x3e82b70) at ../../kio/kio/job.cpp:948
#22 0x00007f13a0acf09d in KIO::TransferJob::qt_metacall (this=0x3e82b70, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff8bf9e840) at ./jobclasses.moc:343
#23 0x00007f13a3274df2 in QMetaObject::activate (sender=0x3e44000, from_signal_index=<value optimized out>, to_signal_index=8, argv=0x0) at kernel/qobject.cpp:3112
#24 0x00007f13a0b91021 in KIO::SlaveInterface::dispatch (this=0x3e44000, _cmd=104, rawdata=<value optimized out>) at ../../kio/kio/slaveinterface.cpp:175
#25 0x00007f13a0b8dab2 in KIO::SlaveInterface::dispatch (this=0x3e44000) at ../../kio/kio/slaveinterface.cpp:91
#26 0x00007f13a0b8051e in KIO::Slave::gotInput (this=0x3e44000) at ../../kio/kio/slave.cpp:322
#27 0x00007f13a0b82848 in KIO::Slave::qt_metacall (this=0x3e44000, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fff8bf9ec60) at ./slave.moc:76
#28 0x00007f13a3274df2 in QMetaObject::activate (sender=0x3eff9c0, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#29 0x00007f13a0a9cd91 in KIO::ConnectionPrivate::dequeue (this=0x2f55420) at ../../kio/kio/connection.cpp:82
#30 0x00007f13a0a9d1ea in KIO::Connection::qt_metacall (this=0x3eff9c0, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x3e791b0) at ./connection.moc:73
#31 0x00007f13a326f6c8 in QObject::event (this=0x3eff9c0, e=0x3e876f0) at kernel/qobject.cpp:1110
#32 0x00007f13a26d901d in QApplicationPrivate::notify_helper (this=0x2249990, receiver=0x3eff9c0, e=0x3e876f0) at kernel/qapplication.cpp:4065
#33 0x00007f13a26e107a in QApplication::notify (this=0x7fff8bf9f7c0, receiver=0x3eff9c0, e=0x3e876f0) at kernel/qapplication.cpp:4030
#34 0x00007f13a3bff0db in KApplication::notify (this=0x7fff8bf9f7c0, receiver=0x3eff9c0, event=0x3e876f0) at ../../kdeui/kernel/kapplication.cpp:302
#35 0x00007f13a325fc9c in QCoreApplication::notifyInternal (this=0x7fff8bf9f7c0, receiver=0x3eff9c0, event=0x3e876f0) at kernel/qcoreapplication.cpp:610
#36 0x00007f13a32608e4 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x2216340) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#37 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x2216340) at kernel/qcoreapplication.cpp:1247
#38 0x00007f13a32887d3 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#39 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:276
#40 0x00007f139c38f12a in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#41 0x00007f139c392988 in ?? () from /lib/libglib-2.0.so.0
#42 0x00007f139c392b3c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#43 0x00007f13a328839c in QEventDispatcherGlib::processEvents (this=0x2215f70, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#44 0x00007f13a276ff1f in QGuiEventDispatcherGlib::processEvents (this=0x406dbe0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#45 0x00007f13a325e562 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#46 0x00007f13a325e934 in QEventLoop::exec (this=0x7fff8bf9f620, flags=...) at kernel/qeventloop.cpp:201
#47 0x00007f13a3260ba4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#48 0x0000000000404751 in _start ()

Reported using DrKonqi