Application that crashed: kmail
Version of the application: 1.12.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-custom x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
While moving two messages from Inbox to another just created folder and selecting the inbox again, kmail crashed.

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#5  0x00007f4acb814c5e in KMReaderWin::parseMsg (this=0x3007b20, aMsg=0x4db7670) at /build/buildd/kdepim-4.3.2/kmail/kmreaderwin.cpp:1681
#6  0x00007f4acb8027ba in KMReaderWin::displayMessage (this=0x3007b20) at /build/buildd/kdepim-4.3.2/kmail/kmreaderwin.cpp:1605
#7  0x00007f4acb8029a5 in KMReaderWin::updateReaderWin (this=0x3007b20) at /build/buildd/kdepim-4.3.2/kmail/kmreaderwin.cpp:1545
#8  0x00007f4acb802d5d in KMReaderWin::update (this=0x4db7670, observable=0x1e2bb94) at /build/buildd/kdepim-4.3.2/kmail/kmreaderwin.cpp:947
#9  0x00007f4acba3fe19 in KMail::ISubject::notify (this=0x4db7740) at /build/buildd/kdepim-4.3.2/kmail/isubject.cpp:30
#10 0x00007f4acb71d99a in KMMessage::updateBodyPart (this=0x4db7670, partSpecifier=
      {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 25413}, alloc = 0, size = 0, data = 0x7f4ac7e0683a, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 3994}, alloc = 0, size = 0, data = 0x7f4ac7e0685a, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x7fffe190ef00, static codecForCStrings = 0x0}, data=<value optimized out>) at /build/buildd/kdepim-4.3.2/kmail/kmmessage.cpp:3235
#11 0x00007f4acba129d4 in KMail::ImapJob::slotGetMessageResult (this=0x4daefd0, job=0x4805c90) at /build/buildd/kdepim-4.3.2/kmail/imapjob.cpp:435
#12 0x00007f4acba15b87 in KMail::ImapJob::qt_metacall (this=0x4daefd0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffe190f090)
    at /build/buildd/kdepim-4.3.2/obj-x86_64-linux-gnu/kmail/imapjob.moc:82
#13 0x00007f4ac7b28ea2 in QMetaObject::activate (sender=0x4805c90, from_signal_index=<value optimized out>, to_signal_index=7, argv=0x1) at kernel/qobject.cpp:3113
#14 0x00007f4acc0f28f2 in KJob::result (this=0x4db7670, _t1=0x4805c90) at /build/buildd/kde4libs-4.3.2/obj-x86_64-linux-gnu/kdecore/kjob.moc:188
#15 0x00007f4acc0f2c6f in KJob::emitResult (this=0x4805c90) at /build/buildd/kde4libs-4.3.2/kdecore/jobs/kjob.cpp:304
#16 0x00007f4ac95045c0 in KIO::SimpleJob::slotFinished (this=0x4805c90) at /build/buildd/kde4libs-4.3.2/kio/kio/job.cpp:477
#17 0x00007f4ac9504a73 in KIO::TransferJob::slotFinished (this=0x4805c90) at /build/buildd/kde4libs-4.3.2/kio/kio/job.cpp:948
#18 0x00007f4ac94ff865 in KIO::TransferJob::qt_metacall (this=0x4805c90, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffe190f490)
    at /build/buildd/kde4libs-4.3.2/obj-x86_64-linux-gnu/kio/jobclasses.moc:343
#19 0x00007f4ac7b28ea2 in QMetaObject::activate (sender=0x4108070, from_signal_index=<value optimized out>, to_signal_index=8, argv=0x1) at kernel/qobject.cpp:3113
#20 0x00007f4ac95c0be1 in KIO::SlaveInterface::dispatch (this=0x4108070, _cmd=104, rawdata=<value optimized out>) at /build/buildd/kde4libs-4.3.2/kio/kio/slaveinterface.cpp:175
#21 0x00007f4ac95bd732 in KIO::SlaveInterface::dispatch (this=0x4108070) at /build/buildd/kde4libs-4.3.2/kio/kio/slaveinterface.cpp:91
#22 0x00007f4ac95b02b3 in KIO::Slave::gotInput (this=0x4108070) at /build/buildd/kde4libs-4.3.2/kio/kio/slave.cpp:322
#23 0x00007f4ac95b2518 in KIO::Slave::qt_metacall (this=0x4108070, _c=QMetaObject::InvokeMetaMethod, _id=73602784, _a=0x7fffe190f8b0)
    at /build/buildd/kde4libs-4.3.2/obj-x86_64-linux-gnu/kio/slave.moc:76
#24 0x00007f4ac7b28ea2 in QMetaObject::activate (sender=0x4112cd0, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x1) at kernel/qobject.cpp:3113
#25 0x00007f4ac94cd161 in KIO::ConnectionPrivate::dequeue (this=0x4136810) at /build/buildd/kde4libs-4.3.2/kio/kio/connection.cpp:82
#26 0x00007f4ac94cd5ba in KIO::Connection::qt_metacall (this=0x4112cd0, _c=QMetaObject::InvokeMetaMethod, _id=73602784, _a=0x48f6650)
    at /build/buildd/kde4libs-4.3.2/obj-x86_64-linux-gnu/kio/connection.moc:73
#27 0x00007f4ac7b235d8 in QObject::event (this=0x4112cd0, e=0x4647c80) at kernel/qobject.cpp:1111
#28 0x00007f4ac821cf4d in QApplicationPrivate::notify_helper (this=0x2169ac0, receiver=0x4112cd0, e=0x4647c80) at kernel/qapplication.cpp:4056
#29 0x00007f4ac822518a in QApplication::notify (this=0x7fffe1910440, receiver=0x4112cd0, e=0x4647c80) at kernel/qapplication.cpp:4021
#30 0x00007f4acc68aabb in KApplication::notify (this=0x7fffe1910440, receiver=0x4112cd0, event=0x4647c80) at /build/buildd/kde4libs-4.3.2/kdeui/kernel/kapplication.cpp:302
#31 0x00007f4ac7b136ac in QCoreApplication::notifyInternal (this=0x7fffe1910440, receiver=0x4112cd0, event=0x4647c80) at kernel/qcoreapplication.cpp:610
#32 0x00007f4ac7b1431a in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x1e2baa0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#33 0x00007f4ac7b3ce03 in postEventSourceDispatch (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#34 0x00007f4abe9f120a in IA__g_main_context_dispatch (context=0x1e5fab0) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#35 0x00007f4abe9f48e0 in g_main_context_iterate (context=0x1e5fab0, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#36 0x00007f4abe9f4a7c in IA__g_main_context_iteration (context=0x1e5fab0, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#37 0x00007f4ac7b3ca8f in QEventDispatcherGlib::processEvents (this=0x1e2b6d0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#38 0x00007f4ac82b5bdf in QGuiEventDispatcherGlib::processEvents (this=0x4db7670, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#39 0x00007f4ac7b11f42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -510590416}) at kernel/qeventloop.cpp:149
#40 0x00007f4ac7b12314 in QEventLoop::exec (this=0x7fffe1910270, flags={i = -510590336}) at kernel/qeventloop.cpp:201
#41 0x00007f4ac7b145e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#42 0x00000000004030db in main (argc=<value optimized out>, argv=<value optimized out>) at /build/buildd/kdepim-4.3.2/kmail/main.cpp:146

Reported using DrKonqi