Application that crashed: kmail
Version of the application: 1.12.0
KDE Version: 4.2.96 (KDE 4.2.96 (KDE 4.3 RC2))
Qt Version: 4.5.2
Operating System: Linux 2.6.30-1-amd64 x86_64
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
Kmail was displaying a popup saying that it could not contact the IMAP server
After clicking on Ok in the popup, kmail crashed

This is not reproducible

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#5  KIO::Slave::deref (this=0x243c900) at ../../kio/kio/slave.cpp:242
#6  0x00007f2b320c7c4a in KIO::Slave::gotInput (this=0x243c900) at ../../kio/kio/slave.cpp:335
#7  0x00007f2b320c9f68 in KIO::Slave::qt_metacall (this=0x243c900, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fff9c9c8f10) at ./slave.moc:76
#8  0x00007f2b38843602 in QMetaObject::activate (sender=0x386c8e0, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x3229df0) at kernel/qobject.cpp:3112
#9  0x00007f2b31fe5281 in KIO::ConnectionPrivate::dequeue (this=0x373f490) at ../../kio/kio/connection.cpp:82
#10 0x00007f2b31fe56da in KIO::Connection::qt_metacall (this=0x386c8e0, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x384ab10) at ./connection.moc:73
#11 0x00007f2b3883dee8 in QObject::event (this=0x386c8e0, e=0x3525bd0) at kernel/qobject.cpp:1110
#12 0x00007f2b37ca67ad in QApplicationPrivate::notify_helper (this=0x20bbeb0, receiver=0x386c8e0, e=0x3525bd0) at kernel/qapplication.cpp:4056
#13 0x00007f2b37cae80a in QApplication::notify (this=0x7fff9c9c9c90, receiver=0x386c8e0, e=0x3525bd0) at kernel/qapplication.cpp:4021
#14 0x00007f2b39edaa1b in KApplication::notify (this=0x7fff9c9c9c90, receiver=0x386c8e0, event=0x3525bd0) at ../../kdeui/kernel/kapplication.cpp:302
#15 0x00007f2b3882e49c in QCoreApplication::notifyInternal (this=0x7fff9c9c9c90, receiver=0x386c8e0, event=0x3525bd0) at kernel/qcoreapplication.cpp:610
#16 0x00007f2b3882f0e4 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x2087340) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#17 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x2087340) at kernel/qcoreapplication.cpp:1247
#18 0x00007f2b37d3e4da in QCoreApplication::sendPostedEvents (this=0x2086fa0, flags=...) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#19 QEventDispatcherX11::processEvents (this=0x2086fa0, flags=...) at kernel/qeventdispatcher_x11.cpp:75
#20 0x00007f2b3882cd62 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#21 0x00007f2b3882d134 in QEventLoop::exec (this=0x7fff9c9c9ae0, flags=...) at kernel/qeventloop.cpp:201
#22 0x00007f2b3882f3a4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#23 0x0000000000402fab in _start ()

Reported using DrKonqi