Application that crashed: kontact
Version of the application: 4.3.2
KDE Version: 4.3.1 (KDE 4.3.1) "release 169"
Qt Version: 4.5.2
Operating System: Linux 2.6.25.20-0.5-default i686

What I was doing when the application crashed:
Could be  Akregator - not a product I was using but could be a background process.
Just using firefox at the time to surf

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 0 (LWP 9959)]

Thread 2 (Thread 0xb03deb90 (LWP 10073)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb651ff42 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb657d56c in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0xb6572b7e in ?? () from /usr/lib/libQtCore.so.4
#4  0xb657c582 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb651c175 in start_thread () from /lib/libpthread.so.0
#6  0xb589edae in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb47646d0 (LWP 9959)):
[KCrash Handler]
#6  0xb5843f5b in strlen () from /lib/libc.so.6
#7  0xb03fbd88 in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#8  0xb03fd8ec in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#9  0xb03efac7 in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#10 0xb03f1b14 in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#11 0xb040054c in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#12 0xb0401a9d in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#13 0xb03fd075 in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#14 0xb03f86a5 in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#15 0xb03e64b9 in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#16 0xb03e6a9a in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#17 0xb0400dec in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#18 0xb0404f90 in ?? () from /usr/lib/kde4/akregator_mk4storage_plugin.so
#19 0xb0469669 in Akregator::Article::Private::Private () from /usr/lib/kde4/akregatorpart.so
#20 0xb046a1dd in Akregator::Article::Article () from /usr/lib/kde4/akregatorpart.so
#21 0xb04760d2 in Akregator::Feed::appendArticles () from /usr/lib/kde4/akregatorpart.so
#22 0xb0477d85 in Akregator::Feed::fetchCompleted () from /usr/lib/kde4/akregatorpart.so
#23 0xb04785d8 in Akregator::Feed::qt_metacall () from /usr/lib/kde4/akregatorpart.so
#24 0xb6686728 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#25 0xb66873b2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#26 0xb1725c5f in Syndication::Loader::loadingComplete () from /usr/lib/libsyndication.so.4
#27 0xb1726ec0 in Syndication::Loader::slotRetrieverDone () from /usr/lib/libsyndication.so.4
#28 0xb17273e9 in Syndication::Loader::qt_metacall () from /usr/lib/libsyndication.so.4
#29 0xb6686728 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#30 0xb66873b2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#31 0xb172983f in Syndication::DataRetriever::dataRetrieved () from /usr/lib/libsyndication.so.4
#32 0xb172a58e in Syndication::FileRetriever::slotResult () from /usr/lib/libsyndication.so.4
#33 0xb172a8bc in Syndication::FileRetriever::qt_metacall () from /usr/lib/libsyndication.so.4
#34 0xb6686728 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#35 0xb66873b2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#36 0xb68a7873 in KJob::result () from /usr/lib/libkdecore.so.5
#37 0xb68a7d19 in KJob::emitResult () from /usr/lib/libkdecore.so.5
#38 0xb6e9fe65 in KIO::SimpleJob::slotFinished () from /usr/lib/libkio.so.5
#39 0xb6ea07a3 in KIO::TransferJob::slotFinished () from /usr/lib/libkio.so.5
#40 0xb6e9cd1b in KIO::TransferJob::qt_metacall () from /usr/lib/libkio.so.5
#41 0xb6686728 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#42 0xb66873b2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#43 0xb6f66ee7 in KIO::SlaveInterface::finished () from /usr/lib/libkio.so.5
#44 0xb6f6ac37 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#45 0xb6f673c7 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#46 0xb6f5912d in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#47 0xb6f5b5c3 in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#48 0xb6686728 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#49 0xb66873b2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#50 0xb6e63907 in KIO::Connection::readyRead () from /usr/lib/libkio.so.5
#51 0xb6e65273 in ?? () from /usr/lib/libkio.so.5
#52 0xb6e65656 in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#53 0xb667fdeb in QMetaCallEvent::placeMetaCall () from /usr/lib/libQtCore.so.4
#54 0xb6681908 in QObject::event () from /usr/lib/libQtCore.so.4
#55 0xb5b586ac in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#56 0xb5b609ce in QApplication::notify () from /usr/lib/libQtGui.so.4
#57 0xb6c21f0d in KApplication::notify () from /usr/lib/libkdeui.so.5
#58 0xb667105b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#59 0xb6671ca5 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#60 0xb6671e9d in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#61 0xb669ccaf in ?? () from /usr/lib/libQtCore.so.4
#62 0xb4e562f9 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#63 0xb4e5987b in ?? () from /usr/lib/libglib-2.0.so.0
#64 0xb4e599f8 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#65 0xb669c8f8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#66 0xb5bf8d45 in ?? () from /usr/lib/libQtGui.so.4
#67 0xb666f69a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#68 0xb666fae2 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#69 0xb6671f69 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#70 0xb5b58527 in QApplication::exec () from /usr/lib/libQtGui.so.4
#71 0x0804c04f in _start ()

Reported using DrKonqi