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-ARCH x86_64

What I was doing when the application crashed:
Using ArchLinux x86_64
qt 4.5.2-6
kde 4.3.1-1

Kmail loses connection when syncing with gmail (an cached imap account), displays a warning and then segfaults.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0x00007fcd091e3068 in KIO::Slave::deref () from /usr/lib/libkio.so.5
#6  0x00007fcd091e3a69 in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#7  0x00007fcd091e5b7c in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#8  0x00007fcd0b864dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#9  0x00007fcd09100ae7 in KIO::ConnectionPrivate::dequeue () from /usr/lib/libkio.so.5
#10 0x00007fcd09100c0d in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#11 0x00007fcd0b85f109 in QObject::event () from /usr/lib/libQtCore.so.4
#12 0x00007fcd0acfb69c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#13 0x00007fcd0ad0296e in QApplication::notify () from /usr/lib/libQtGui.so.4
#14 0x00007fcd0c1ef8d6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#15 0x00007fcd0b84fcec in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#16 0x00007fcd0b8508ca in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#17 0x00007fcd0b878543 in ?? () from /usr/lib/libQtCore.so.4
#18 0x00007fcd043eddbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#19 0x00007fcd043f1568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#20 0x00007fcd043f1690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#21 0x00007fcd0b8781b6 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#22 0x00007fcd0ad8e64e in ?? () from /usr/lib/libQtGui.so.4
#23 0x00007fcd0b84e5f2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#24 0x00007fcd0b84e9c4 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#25 0x00007fcd0b850b79 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#26 0x0000000000403ef7 in _start ()

Reported using DrKonqi