Version:            (using KDE 4.2.2)
Compiler:          gcc 4.3.2 20081105 (Red Hat 4.3.2-7) 
OS:                Linux
Installed from:    Fedora RPMs

Here's my backtrace:

--snip--
Application: Kontact (kontact), signal SIGSEGV
[Current thread is 1 (Thread 0xb809f770 (LWP 2517))]

Thread 3 (Thread 0xb21ffb90 (LWP 2553)):
#0  0x00986416 in __kernel_vsyscall ()
#1  0x0891a3d1 in select () from /lib/libc.so.6
#2  0x0133db67 in ?? () from /usr/lib/libQtCore.so.4
#3  0x0126be2e in ?? () from /usr/lib/libQtCore.so.4
#4  0x03d1f51f in start_thread (arg=0xb21ffb90) at pthread_create.c:297
#5  0x0892204e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 2 (Thread 0xb2f03b90 (LWP 5854)):
#0  0x00986416 in __kernel_vsyscall ()
#1  0x03d23432 in pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S:179
#2  0x0126ce4c in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0x01262376 in ?? () from /usr/lib/libQtCore.so.4
#4  0x0126be2e in ?? () from /usr/lib/libQtCore.so.4
#5  0x03d1f51f in start_thread (arg=0xb2f03b90) at pthread_create.c:297
#6  0x0892204e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb809f770 (LWP 2517)):
[KCrash Handler]
#6  0x00a73bfe in KHTMLPart::slotChildStarted () from /usr/lib/libkhtml.so.5
#7  0x00a9f811 in KHTMLPart::qt_metacall () from /usr/lib/libkhtml.so.5
#8  0x013763a8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#9  0x01377b32 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#10 0x00959a53 in KParts::ReadOnlyPart::started () from /usr/lib/libkparts.so.4
#11 0x00aa8c8d in ?? () from /usr/lib/libkhtml.so.5
#12 0x00a91777 in KHTMLPart::requestObject () from /usr/lib/libkhtml.so.5
#13 0x00a95a0a in KHTMLPart::requestFrame () from /usr/lib/libkhtml.so.5
#14 0x00b53cbb in ?? () from /usr/lib/libkhtml.so.5
#15 0x00b6fb34 in ?? () from /usr/lib/libkhtml.so.5
#16 0x00b2d688 in ?? () from /usr/lib/libkhtml.so.5
#17 0x00b2d848 in ?? () from /usr/lib/libkhtml.so.5
#18 0x00b2db96 in ?? () from /usr/lib/libkhtml.so.5
#19 0x00b357f9 in ?? () from /usr/lib/libkhtml.so.5
#20 0x00addfe6 in ?? () from /usr/lib/libkhtml.so.5
#21 0x00a85d3a in KHTMLPart::clear () from /usr/lib/libkhtml.so.5
#22 0x00a88544 in KHTMLPart::~KHTMLPart () from /usr/lib/libkhtml.so.5
#23 0x00a859d6 in KHTMLPart::clear () from /usr/lib/libkhtml.so.5
#24 0x00a88544 in KHTMLPart::~KHTMLPart () from /usr/lib/libkhtml.so.5
#25 0x03347464 in ?? () from /usr/lib/kde4/akregatorpart.so
#26 0x03345589 in ?? () from /usr/lib/kde4/akregatorpart.so
#27 0x03342410 in ?? () from /usr/lib/kde4/akregatorpart.so
#28 0x03344357 in ?? () from /usr/lib/kde4/akregatorpart.so
#29 0x013763a8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#30 0x01377b32 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#31 0x033322d3 in ?? () from /usr/lib/kde4/akregatorpart.so
#32 0x0333243c in ?? () from /usr/lib/kde4/akregatorpart.so
#33 0x010c7370 in KRun::mimeTypeDetermined () from /usr/lib/libkio.so.5
#34 0x009701bb in KParts::BrowserRun::slotBrowserMimetype () from /usr/lib/libkparts.so.4
#35 0x00970e2e in KParts::BrowserRun::qt_metacall () from /usr/lib/libkparts.so.4
#36 0x0333231a in ?? () from /usr/lib/kde4/akregatorpart.so
#37 0x013763a8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#38 0x01377b32 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#39 0x01053bf9 in KIO::TransferJob::mimetype () from /usr/lib/libkio.so.5
#40 0x01054712 in KIO::TransferJob::slotMimetype () from /usr/lib/libkio.so.5
#41 0x0105e8cd in KIO::TransferJob::qt_metacall () from /usr/lib/libkio.so.5
#42 0x013763a8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#43 0x01377b32 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#44 0x0110d693 in KIO::SlaveInterface::mimeType () from /usr/lib/libkio.so.5
#45 0x011101d4 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#46 0x0110e187 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#47 0x01100a80 in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#48 0x01100df3 in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#49 0x013763a8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#50 0x01377b32 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#51 0x01029627 in KIO::Connection::readyRead () from /usr/lib/libkio.so.5
#52 0x0102b053 in ?? () from /usr/lib/libkio.so.5
#53 0x0102b6a6 in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#54 0x0136effb in QMetaCallEvent::placeMetaCall () from /usr/lib/libQtCore.so.4
#55 0x01370aa0 in QObject::event () from /usr/lib/libQtCore.so.4
#56 0x01567cec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#57 0x0156ffce in QApplication::notify () from /usr/lib/libQtGui.so.4
#58 0x020a5a1d in KApplication::notify () from /usr/lib/libkdeui.so.5
#59 0x013600fb in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#60 0x01360d55 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#61 0x01360f4d in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#62 0x0138bedf in ?? () from /usr/lib/libQtCore.so.4
#63 0x02930258 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#64 0x02933903 in ?? () from /lib/libglib-2.0.so.0
#65 0x02933ac1 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#66 0x0138bb28 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#67 0x01607665 in ?? () from /usr/lib/libQtGui.so.4
#68 0x0135e72a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#69 0x0135eb6a in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#70 0x01361019 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#71 0x01567b67 in QApplication::exec () from /usr/lib/libQtGui.so.4
#72 0x0804bc1f in _start ()
--snip--