Version:            (using KDE 4.2.4)
OS:                Linux
Installed from:    Ubuntu Packages

To make this crash occur, I typed some text in the search bar above a mailbox (my Inbox) and then selected one of the messages that appeared.  It may be noteworthy that 3 copies of the message appeared in the Inbox view, yet other mail clients show only one.

Expected behaviour is to not crash.  Furthermore, the ghost copies of emails is quite annoying, but that's a different bug.

The crash resulted in the following backtrace:

Application: Kontact (kontact), signal SIGABRT
0x00007fb708bf6d21 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (LWP 18137)]

Thread 3 (Thread 0x7fb6edfba950 (LWP 18382)):
#0  0x00007fb705fa52e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fb7096d8939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007fb70b09e4cc in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007fb7096d7952 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fb705fa13ba in start_thread () from /lib/libpthread.so.0
#5  0x00007fb708c34fcd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fb6e7fff950 (LWP 28283)):
#0  0x00007fb708c2d742 in select () from /lib/libc.so.6
#1  0x00007fb70979ef06 in ?? () from /usr/lib/libQtCore.so.4
#2  0x00007fb7096d7952 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007fb705fa13ba in start_thread () from /lib/libpthread.so.0
#4  0x00007fb708c34fcd in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fb70f09f750 (LWP 18137)):
[KCrash Handler]
#5  0x00007fb708b81fb5 in raise () from /lib/libc.so.6
#6  0x00007fb708b83bc3 in abort () from /lib/libc.so.6
#7  0x00007fb7096cf885 in qt_message_output () from /usr/lib/libQtCore.so.4
#8  0x00007fb7096cf9cb in qFatal () from /usr/lib/libQtCore.so.4
#9  0x00007fb6f665b1d8 in ?? () from /usr/lib/libkmailprivate.so.4
#10 0x00007fb6f66b8ad3 in ?? () from /usr/lib/libkmailprivate.so.4
#11 0x00007fb6f6661a94 in ?? () from /usr/lib/libkmailprivate.so.4
#12 0x00007fb6f66c1ef4 in ?? () from /usr/lib/libkmailprivate.so.4
#13 0x00007fb6f66f04ad in ?? () from /usr/lib/libkmailprivate.so.4
#14 0x00007fb6f664d835 in ?? () from /usr/lib/libkmailprivate.so.4
#15 0x00007fb6f66f62fa in ?? () from /usr/lib/libkmailprivate.so.4
#16 0x00007fb6f662afa8 in ?? () from /usr/lib/libkmailprivate.so.4
#17 0x00007fb6f663bf44 in ?? () from /usr/lib/libkmailprivate.so.4
#18 0x00007fb6f663d1bd in ?? () from /usr/lib/libkmailprivate.so.4
#19 0x00007fb6f663d47c in ?? () from /usr/lib/libkmailprivate.so.4
#20 0x00007fb7097d61f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#21 0x00007fb6f6849aaf in ?? () from /usr/lib/libkmailprivate.so.4
#22 0x00007fb6f685bc78 in ?? () from /usr/lib/libkmailprivate.so.4
#23 0x00007fb6f685bfe7 in ?? () from /usr/lib/libkmailprivate.so.4
#24 0x00007fb7097d61f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#25 0x00007fb709e17932 in KJob::result () from /usr/lib/libkdecore.so.5
#26 0x00007fb709e17caf in KJob::emitResult () from /usr/lib/libkdecore.so.5
#27 0x00007fb70bc70760 in KIO::SimpleJob::slotFinished () from /usr/lib/libkio.so.5
#28 0x00007fb70bc71983 in KIO::TransferJob::slotFinished () from /usr/lib/libkio.so.5
#29 0x00007fb70bc72a05 in KIO::TransferJob::qt_metacall () from /usr/lib/libkio.so.5
#30 0x00007fb7097d61f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#31 0x00007fb70bd26ec1 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#32 0x00007fb70bd23a12 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#33 0x00007fb70bd14c03 in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#34 0x00007fb70bd16f08 in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#35 0x00007fb7097d61f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#36 0x00007fb70bc3c361 in ?? () from /usr/lib/libkio.so.5
#37 0x00007fb70bc3c7ba in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#38 0x00007fb7097d0848 in QObject::event () from /usr/lib/libQtCore.so.4
#39 0x00007fb70a36678d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#40 0x00007fb70a36e97a in QApplication::notify () from /usr/lib/libQtGui.so.4
#41 0x00007fb70b79b84b in KApplication::notify () from /usr/lib/libkdeui.so.5
#42 0x00007fb7097c075c in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#43 0x00007fb7097c13ca in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#44 0x00007fb7097ea1e3 in ?? () from /usr/lib/libQtCore.so.4
#45 0x00007fb702f0720a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#46 0x00007fb702f0a8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#47 0x00007fb702f0aa7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#48 0x00007fb7097e9e6f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#49 0x00007fb70a3febef in ?? () from /usr/lib/libQtGui.so.4
#50 0x00007fb7097bf002 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#51 0x00007fb7097bf3cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#52 0x00007fb7097c1694 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#53 0x0000000000404a15 in _start ()