Application that crashed: kontact
Version of the application: 4.3.1
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-custom i686
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
I have an online imap (localhost) account configured.

When I went to the next message (which has lots of attachments), while kmail was loading the mail, I clicked on one of the attachments. And then exactly, kontact crashed

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  DwString::c_str (this=0x9fc51a8, msg=0xa2e65c8, partSpecifier=...) at ../../mimelib/mimelib/string.h:618
#7  DwMessageComponent::partId (this=0x9fc51a8, msg=0xa2e65c8, partSpecifier=...) at ../../mimelib/mimelib/msgcmp.h:259
#8  KMLoadPartsCommand::slotPartRetrieved (this=0x9fc51a8, msg=0xa2e65c8, partSpecifier=...) at ../../kmail/kmcommands.cpp:2742
#9  0xb12125ad in KMLoadPartsCommand::qt_metacall (this=0x9fc51a8, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xbfe389a8) at ./kmcommands.moc:1858
#10 0xb76fab33 in QMetaObject::activate (sender=0x9dc56d0, from_signal_index=5, to_signal_index=5, argv=0xbfe389a8) at kernel/qobject.cpp:3112
#11 0xb76fb782 in QMetaObject::activate (sender=0x9dc56d0, m=0xb16364d0, local_signal_index=1, argv=0xbfe389a8) at kernel/qobject.cpp:3186
#12 0xb1267649 in KMail::FolderJob::messageUpdated (this=0x9dc56d0, _t1=0xa2e65c8, _t2=...) at ./folderjob.moc:106
#13 0xb1273f1b in KMail::ImapJob::slotGetMessageResult (this=0x9dc56d0, job=0xa1f0bf8) at ../../kmail/imapjob.cpp:476
#14 0xb12784bc in KMail::ImapJob::qt_metacall (this=0x9dc56d0, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfe38b1c) at ./imapjob.moc:82
#15 0xb76fab33 in QMetaObject::activate (sender=0xa1f0bf8, from_signal_index=7, to_signal_index=7, argv=0xbfe38b1c) at kernel/qobject.cpp:3112
#16 0xb76fb782 in QMetaObject::activate (sender=0xa1f0bf8, m=0xb7a0db48, local_signal_index=3, argv=0xbfe38b1c) at kernel/qobject.cpp:3186
#17 0xb78b13d3 in KJob::result (this=0xa1f0bf8, _t1=0xa1f0bf8) at ./kjob.moc:188
#18 0xb78b1879 in KJob::emitResult (this=0xa1f0bf8) at ../../kdecore/jobs/kjob.cpp:304
#19 0xb610e7b5 in KIO::SimpleJob::slotFinished (this=0xa1f0bf8) at ../../kio/kio/job.cpp:477
#20 0xb610f113 in KIO::TransferJob::slotFinished (this=0xa1f0bf8) at ../../kio/kio/job.cpp:948
#21 0xb610b6a3 in KIO::TransferJob::qt_metacall (this=0xa1f0bf8, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfe38d58) at ./jobclasses.moc:343
#22 0xb76fab33 in QMetaObject::activate (sender=0x973f840, from_signal_index=8, to_signal_index=8, argv=0x0) at kernel/qobject.cpp:3112
#23 0xb76fb782 in QMetaObject::activate (sender=0x973f840, m=0xb62b5b84, local_signal_index=4, argv=0x0) at kernel/qobject.cpp:3186
#24 0xb61d4437 in KIO::SlaveInterface::finished (this=0x973f840) at ./slaveinterface.moc:165
#25 0xb61d81e7 in KIO::SlaveInterface::dispatch (this=0x973f840, _cmd=104, rawdata=...) at ../../kio/kio/slaveinterface.cpp:175
#26 0xb61d4917 in KIO::SlaveInterface::dispatch (this=0x973f840) at ../../kio/kio/slaveinterface.cpp:91
#27 0xb61c68fd in KIO::Slave::gotInput (this=0x973f840) at ../../kio/kio/slave.cpp:322
#28 0xb61c8de3 in KIO::Slave::qt_metacall (this=0x973f840, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfe39028) at ./slave.moc:76
#29 0xb76fab33 in QMetaObject::activate (sender=0x9733fb8, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#30 0xb76fb782 in QMetaObject::activate (sender=0x9733fb8, m=0xb62b24c0, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3186
#31 0xb60d2937 in KIO::Connection::readyRead (this=0x9733fb8) at ./connection.moc:86
#32 0xb60d4243 in KIO::ConnectionPrivate::dequeue (this=0x9733fc8) at ../../kio/kio/connection.cpp:82
#33 0xb60d4626 in KIO::Connection::qt_metacall (this=0x9733fb8, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xa14e5e0) at ./connection.moc:73
#34 0xb76f433b in QMetaCallEvent::placeMetaCall (this=0x9fc6a78, object=0x9733fb8) at kernel/qobject.cpp:477
#35 0xb76f5e10 in QObject::event (this=0x9733fb8, e=0x9fc6a78) at kernel/qobject.cpp:1110
#36 0xb6d25814 in QApplicationPrivate::notify_helper (this=0x8bd9968, receiver=0x9733fb8, e=0x9fc6a78) at kernel/qapplication.cpp:4056
#37 0xb6d2d97e in QApplication::notify (this=0xbfe3999c, receiver=0x9733fb8, e=0x9fc6a78) at kernel/qapplication.cpp:3603
#38 0xb7be64ad in KApplication::notify (this=0xbfe3999c, receiver=0x9733fb8, event=0x9fc6a78) at ../../kdeui/kernel/kapplication.cpp:302
#39 0xb76e59cb in QCoreApplication::notifyInternal (this=0xbfe3999c, receiver=0x9733fb8, event=0x9fc6a78) at kernel/qcoreapplication.cpp:610
#40 0xb76e660e in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x8bb2998) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#41 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8bb2998) at kernel/qcoreapplication.cpp:1247
#42 0xb76e67ed in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#43 0xb6dc60ce in QCoreApplication::sendPostedEvents (this=0x8bb26e8, flags=...) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#44 QEventDispatcherX11::processEvents (this=0x8bb26e8, flags=...) at kernel/qeventdispatcher_x11.cpp:75
#45 0xb76e401a in QEventLoop::processEvents (this=0xbfe39810, flags=...) at kernel/qeventloop.cpp:149
#46 0xb76e4462 in QEventLoop::exec (this=0xbfe39810, flags=...) at kernel/qeventloop.cpp:201
#47 0xb76e68b9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#48 0xb6d25697 in QApplication::exec () at kernel/qapplication.cpp:3525
#49 0x0804bd40 in main (argc=1, argv=0xbfe39b94) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi