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:
was entering an email address in the "to" field. The address book is populated by LDAP. Kontact crashed. I can reproduce this this on a daily baisi. Waiting for an updated package from squeeze

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0x00007f53c2c7752f in KPIM::AddresseeLineEdit::slotLDAPSearchData(QList<KPIM::LdapResult> const&) () from /usr/lib/libkdepim.so.4
#6  0x00007f53c2c7851c in KPIM::AddresseeLineEdit::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdepim.so.4
#7  0x00007f53abc3f3ed in ?? () from /usr/lib/libkmailprivate.so.4
#8  0x00007f53abcaeb7d in ?? () from /usr/lib/libkmailprivate.so.4
#9  0x00007f53c1e4cdf2 in QMetaObject::activate (sender=0x1fb2e40, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x0) at kernel/qobject.cpp:3112
#10 0x00007f53c2c7b275 in KPIM::LdapSearch::searchData(QList<KPIM::LdapResult> const&) () from /usr/lib/libkdepim.so.4
#11 0x00007f53c2c7e3e1 in KPIM::LdapSearch::slotDataTimer() () from /usr/lib/libkdepim.so.4
#12 0x00007f53c2c7e465 in KPIM::LdapSearch::finish() () from /usr/lib/libkdepim.so.4
#13 0x00007f53c2c80d88 in KPIM::LdapSearch::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdepim.so.4
#14 0x00007f53c1e4cdf2 in QMetaObject::activate (sender=0x1fb66d0, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#15 0x00007f53c2c7b969 in KPIM::LdapClient::slotDone() () from /usr/lib/libkdepim.so.4
#16 0x00007f53c2c814d8 in KPIM::LdapClient::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdepim.so.4
#17 0x00007f53c1e4cdf2 in QMetaObject::activate (sender=0x312b790, from_signal_index=<value optimized out>, to_signal_index=7, argv=0x0) at kernel/qobject.cpp:3112
#18 0x00007f53c2224e52 in KJob::result (this=0x248e100, _t1=0x312b790) at ./kjob.moc:188
#19 0x00007f53c22251cf in KJob::emitResult (this=0x312b790) at ../../kdecore/jobs/kjob.cpp:304
#20 0x00007f53bf6abec0 in KIO::SimpleJob::slotFinished (this=0x312b790) at ../../kio/kio/job.cpp:477
#21 0x00007f53bf6ac383 in KIO::TransferJob::slotFinished (this=0x312b790) at ../../kio/kio/job.cpp:948
#22 0x00007f53bf6a709d in KIO::TransferJob::qt_metacall (this=0x312b790, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffb1cb0080) at ./jobclasses.moc:343
#23 0x00007f53c1e4cdf2 in QMetaObject::activate (sender=0x20149b0, from_signal_index=<value optimized out>, to_signal_index=8, argv=0x0) at kernel/qobject.cpp:3112
#24 0x00007f53bf769021 in KIO::SlaveInterface::dispatch (this=0x20149b0, _cmd=104, rawdata=<value optimized out>) at ../../kio/kio/slaveinterface.cpp:175
#25 0x00007f53bf765ab2 in KIO::SlaveInterface::dispatch (this=0x20149b0) at ../../kio/kio/slaveinterface.cpp:91
#26 0x00007f53bf75851e in KIO::Slave::gotInput (this=0x20149b0) at ../../kio/kio/slave.cpp:322
#27 0x00007f53bf75a848 in KIO::Slave::qt_metacall (this=0x20149b0, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fffb1cb04a0) at ./slave.moc:76
#28 0x00007f53c1e4cdf2 in QMetaObject::activate (sender=0x338b530, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#29 0x00007f53bf674d91 in KIO::ConnectionPrivate::dequeue (this=0x25c8210) at ../../kio/kio/connection.cpp:82
#30 0x00007f53bf6751ea in KIO::Connection::qt_metacall (this=0x338b530, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x1fb0b40) at ./connection.moc:73
#31 0x00007f53c1e476c8 in QObject::event (this=0x338b530, e=0x2046390) at kernel/qobject.cpp:1110
#32 0x00007f53c12b101d in QApplicationPrivate::notify_helper (this=0x1736e40, receiver=0x338b530, e=0x2046390) at kernel/qapplication.cpp:4065
#33 0x00007f53c12b907a in QApplication::notify (this=0x7fffb1cb1000, receiver=0x338b530, e=0x2046390) at kernel/qapplication.cpp:4030
#34 0x00007f53c27d70db in KApplication::notify (this=0x7fffb1cb1000, receiver=0x338b530, event=0x2046390) at ../../kdeui/kernel/kapplication.cpp:302
#35 0x00007f53c1e37c9c in QCoreApplication::notifyInternal (this=0x7fffb1cb1000, receiver=0x338b530, event=0x2046390) at kernel/qcoreapplication.cpp:610
#36 0x00007f53c1e388e4 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x1704340) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#37 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x1704340) at kernel/qcoreapplication.cpp:1247
#38 0x00007f53c1e607d3 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 0x00007f53baf6712a in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#41 0x00007f53baf6a988 in ?? () from /lib/libglib-2.0.so.0
#42 0x00007f53baf6ab3c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#43 0x00007f53c1e6039c in QEventDispatcherGlib::processEvents (this=0x1703f70, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#44 0x00007f53c1347f1f in QGuiEventDispatcherGlib::processEvents (this=0x248e100, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#45 0x00007f53c1e36562 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#46 0x00007f53c1e36934 in QEventLoop::exec (this=0x7fffb1cb0e60, flags=...) at kernel/qeventloop.cpp:201
#47 0x00007f53c1e38ba4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#48 0x0000000000404751 in _start ()

Reported using DrKonqi