Application that crashed: kmail
Version of the application: 1.12.4
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.32-3-686-bigmem i686
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
In a yahoogroups.com-style email list digest, I clicked on a link to an attached pdf file. The application-chooser prompt appeared. No MIME-type was specified. I chose konqueror. The attachment opened properly, and kmail crashed.

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#6  0xb4be0b2d in KIO::Slave::deref() () from /usr/lib/libkio.so.5
#7  0xb4be16d6 in KIO::Slave::gotInput() () from /usr/lib/libkio.so.5
#8  0xb4be3ac3 in KIO::Slave::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#9  0xb68e8303 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#10 0xb68e8f42 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#11 0xb4aeafc7 in KIO::Connection::readyRead() () from /usr/lib/libkio.so.5
#12 0xb4aecd8e in ?? () from /usr/lib/libkio.so.5
#13 0xb4aecebe in KIO::Connection::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#14 0xb68e1b0b in QMetaCallEvent::placeMetaCall(QObject*) () from /usr/lib/libQtCore.so.4
#15 0xb68e35e0 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#16 0xb5f12a94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb5f1abee in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#18 0xb76a0e2a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#19 0xb68d31eb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#20 0xb68d3e2e in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#21 0xb68d400d in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#22 0xb68fe4cf in ?? () from /usr/lib/libQtCore.so.4
#23 0xb3fd0b38 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#24 0xb3fd43d0 in ?? () from /lib/libglib-2.0.so.0
#25 0xb3fd4503 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#26 0xb68fe041 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#27 0xb5fb2305 in ?? () from /usr/lib/libQtGui.so.4
#28 0xb68d183a in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#29 0xb68d1c82 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0xb68d40d9 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#31 0xb5f12917 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#32 0x0804a6e2 in _start ()

This bug may be a duplicate of or related to bug 214728

Reported using DrKonqi