Application that crashed: kmail
Version of the application: 1.12.4
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.6.0
Operating System: Linux 2.6.32-2.slh.4-sidux-686 i686
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
my wireless connection dropped, and then kmail crashed.

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#6  KIO::Slave::deref (this=0x8fa32a0) at ../../kio/kio/slave.cpp:242
#7  0xb4b00bdc in KIO::Slave::gotInput (this=0x8fa32a0) at ../../kio/kio/slave.cpp:335
#8  0xb4b030b3 in KIO::Slave::qt_metacall (this=0x8fa32a0, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfb04cb8) at ./slave.moc:76
#9  0xb68e2755 in QMetaObject::metacall (object=0xb5bcd3c0, cl=QMetaObject::InvokeMetaMethod, idx=30, argv=0xbfb04cb8) at kernel/qmetaobject.cpp:237
#10 0xb68f1ad1 in QMetaObject::activate (sender=0x8e75870, m=0xb4bec4c0, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3294
#11 0xb4a0cc07 in KIO::Connection::readyRead (this=0x8e75870) at ./connection.moc:86
#12 0xb4a0e513 in KIO::ConnectionPrivate::dequeue (this=0x8f9efd0) at ../../kio/kio/connection.cpp:82
#13 0xb4a0e8f6 in KIO::Connection::qt_metacall (this=0x8e75870, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x9954188) at ./connection.moc:73
#14 0xb68e2755 in QMetaObject::metacall (object=0xb5bcd3c0, cl=QMetaObject::InvokeMetaMethod, idx=5, argv=0x9954188) at kernel/qmetaobject.cpp:237
#15 0xb68eccc6 in QMetaCallEvent::placeMetaCall (this=0x97571c8, object=0x8e75870) at kernel/qobject.cpp:574
#16 0xb68ee163 in QObject::event (this=0x8e75870, e=0x97571c8) at kernel/qobject.cpp:1260
#17 0xb5e37b5c in QApplicationPrivate::notify_helper (this=0x8a0e6b0, receiver=0x8e75870, e=0x97571c8) at kernel/qapplication.cpp:4242
#18 0xb5e3f33d in QApplication::notify (this=0xbfb055f0, receiver=0x8e75870, e=0x97571c8) at kernel/qapplication.cpp:3661
#19 0xb76c562d in KApplication::notify (this=0xbfb055f0, receiver=0x8e75870, event=0x97571c8) at ../../kdeui/kernel/kapplication.cpp:302
#20 0xb68dd3eb in QCoreApplication::notifyInternal (this=0xbfb055f0, receiver=0x8e75870, event=0x97571c8) at kernel/qcoreapplication.cpp:704
#21 0xb68de31f in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x89e14e0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#22 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x89e14e0) at kernel/qcoreapplication.cpp:1345
#23 0xb68de4cd in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1238
#24 0xb69099cf in QCoreApplication::sendPostedEvents (s=0x8a11510) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#25 postEventSourceDispatch (s=0x8a11510) at kernel/qeventdispatcher_glib.cpp:276
#26 0xb3c24b38 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#27 0xb3c283d0 in ?? () from /lib/libglib-2.0.so.0
#28 0xb3c28503 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#29 0xb69094e1 in QEventDispatcherGlib::processEvents (this=0x89e1068, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#30 0xb5ef39a5 in QGuiEventDispatcherGlib::processEvents (this=0x89e1068, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#31 0xb68dba3a in QEventLoop::processEvents (this=0xbfb054f0, flags=...) at kernel/qeventloop.cpp:149
#32 0xb68dbe82 in QEventLoop::exec (this=0xbfb054f0, flags=...) at kernel/qeventloop.cpp:201
#33 0xb68de599 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#34 0xb5e37bf7 in QApplication::exec () at kernel/qapplication.cpp:3570
#35 0x0804a6e2 in main (argc=3, argv=0xbfb05784) at ../../kmail/main.cpp:146

Reported using DrKonqi