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 2.6.31.12-174.2.3.fc12.x86_64 x86_64
Distribution: "Fedora release 12 (Constantine)"

What I was doing when the application crashed:
kmail crashes (repeatably) after connection times out, and I close the dialog telling me so

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#5  0x000000373979f298 in KIO::Slave::deref() () from /usr/lib64/libkio.so.5
#6  0x000000373979fc89 in KIO::Slave::gotInput() () from /usr/lib64/libkio.so.5
#7  0x00000037397a1d8c in KIO::Slave::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkio.so.5
#8  0x0000003fe835408c in QMetaObject::activate (sender=0x30273b0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3112
#9  0x00000037396bb207 in ?? () from /usr/lib64/libkio.so.5
#10 0x00000037396bb31d in KIO::Connection::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkio.so.5
#11 0x0000003fe834e401 in QObject::event (this=0x30273b0, e=0x317b000) at kernel/qobject.cpp:1110
#12 0x0000003736b8f65c in QApplicationPrivate::notify_helper (this=0x1fd1e90, receiver=0x30273b0, e=0x317b000) at kernel/qapplication.cpp:4065
#13 0x0000003736b968ce in QApplication::notify (this=<value optimized out>, receiver=0x30273b0, e=0x317b000) at kernel/qapplication.cpp:4030
#14 0x0000003738811a66 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#15 0x0000003fe833ee6c in QCoreApplication::notifyInternal (this=0x7fffcb204240, receiver=0x30273b0, event=0x317b000) at kernel/qcoreapplication.cpp:610
#16 0x0000003fe833fa42 in sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x1f98900) at kernel/qcoreapplication.h:213
#17 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x1f98900) at kernel/qcoreapplication.cpp:1247
#18 0x0000003fe8367573 in sendPostedEvents (s=<value optimized out>) at kernel/qcoreapplication.h:218
#19 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:210
#20 0x0000003fdea3922e in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#21 0x0000003fdea3cc18 in ?? () from /lib64/libglib-2.0.so.0
#22 0x0000003fdea3cd3a in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#23 0x0000003fe83671e6 in QEventDispatcherGlib::processEvents (this=0x1f98170, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#24 0x0000003736c21ffe in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#25 0x0000003fe833d772 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#26 0x0000003fe833db44 in QEventLoop::exec (this=0x7fffcb204090, flags=...) at kernel/qeventloop.cpp:201
#27 0x0000003fe833fcd9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#28 0x0000000000402e69 in _start ()

Reported using DrKonqi