Application that crashed: kmail
Version of the application: 1.12.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.31-ARCH i686

What I was doing when the application crashed:
1. KMail informed me it lost network connection via alert box (I've unplugged
my ethernet cable)
2. I clicked 'ok'
3. Kmail crashed

Note : It not happens all time


 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#6  0xb4c825dd in KIO::Slave::deref() () from /usr/lib/libkio.so.5
#7  0xb4c83186 in KIO::Slave::gotInput() () from /usr/lib/libkio.so.5
#8  0xb4c85573 in KIO::Slave::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#9  0xb69298ac in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#10 0xb692a4e2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#11 0xb4b8df47 in KIO::Connection::readyRead() () from /usr/lib/libkio.so.5
#12 0xb4b8fcfe in KIO::ConnectionPrivate::dequeue() () from /usr/lib/libkio.so.5
#13 0xb4b8fe2e in KIO::Connection::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#14 0xb692259b in QMetaCallEvent::placeMetaCall(QObject*) () from /usr/lib/libQtCore.so.4
#15 0xb6923c9e in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#16 0xb5f6b3a4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb5f72a8c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#18 0xb76dd0aa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#19 0xb6913e8b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#20 0xb6914ab2 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#21 0xb6914c7d in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#22 0xb693ea9f in ?? () from /usr/lib/libQtCore.so.4
#23 0xb409a328 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#24 0xb409dba0 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#25 0xb409dcd3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#26 0xb693e5f5 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#27 0xb6009185 in ?? () from /usr/lib/libQtGui.so.4
#28 0xb6912479 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#29 0xb69128ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0xb6914d3f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#31 0xb5f6b227 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#32 0x0804a6b2 in _start ()

Reported using DrKonqi