Version:           1.10.3 (using KDE 4.1.3)
OS:                Linux
Installed from:    Ubuntu Packages

When KMail crashed, I got the following report :

Application : KMail (kmail), signal SIGSEGV
[Thread debugging using libthread_db enabled]
[New Thread 0xb41d96c0 (LWP 25957)]
[KCrash handler]
#6  0xb785dea1 in KMail::ISubject::notify (this=0xa300214)
    at /build/buildd/kdepim-4.1.3/kmail/isubject.cpp:30
#7  0xb74ca646 in KMMessage::updateBodyPart (this=0xa3001f8, partSpecifier=
      {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 14360}, alloc = 0, size = 0, data = 0xb7fcb9ba, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 558}, alloc = 0, size = 0, data = 0xb7fcb9ce, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0xbfafbcec, static codecForCStrings = 0x0}, 
    data=@0xa3143f0) at /build/buildd/kdepim-4.1.3/kmail/kmmessage.cpp:4178
#8  0xb783195d in KMail::ImapJob::slotGetMessageResult (this=0xa39aad8, 
    job=0xa420250) at /build/buildd/kdepim-4.1.3/kmail/imapjob.cpp:435
#9  0xb7835ee4 in KMail::ImapJob::qt_metacall (this=0xa39aad8, 
    _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfafbdfc)
    at /build/buildd/kdepim-4.1.3/obj-i486-linux-gnu/kmail/imapjob.moc:81
#10 0xb7efaa60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#11 0xb7efb7e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#12 0xb7c5f283 in KJob::result (this=0xa420250, _t1=0xa420250)
    at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kdecore/kjob.moc:186
#13 0xb7c5f792 in KJob::emitResult (this=0xa420250)
    at /build/buildd/kde4libs-4.1.3/kdecore/jobs/kjob.cpp:290
#14 0xb53f98c5 in KIO::SimpleJob::slotFinished (this=0xa420250)
    at /build/buildd/kde4libs-4.1.3/kio/kio/job.cpp:498
#15 0xb5400353 in KIO::TransferJob::slotFinished (this=0xa420250)
    at /build/buildd/kde4libs-4.1.3/kio/kio/job.cpp:967
#16 0xb540112b in KIO::TransferJob::qt_metacall (this=0xa420250, 
    _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfafc038)
    at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/jobclasses.moc:336
#17 0xb7efaa60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0xb7efb7e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0xb54bff27 in KIO::SlaveInterface::finished (this=0xa124dc8)
    at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/slaveinterface.moc:161
#20 0xb54c3b97 in KIO::SlaveInterface::dispatch (this=0xa124dc8, _cmd=104, 
    rawdata=@0xbfafc204)
    at /build/buildd/kde4libs-4.1.3/kio/kio/slaveinterface.cpp:175
#21 0xb54c06a7 in KIO::SlaveInterface::dispatch (this=0xa124dc8)
    at /build/buildd/kde4libs-4.1.3/kio/kio/slaveinterface.cpp:90
#22 0xb54b06cd in KIO::Slave::gotInput (this=0xa124dc8)
    at /build/buildd/kde4libs-4.1.3/kio/kio/slave.cpp:322
#23 0xb54b3113 in KIO::Slave::qt_metacall (this=0xa124dc8, 
    _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfafc318)
    at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/slave.moc:75
#24 0xb7efaa60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#25 0xb7efb7e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#26 0xb53c08f7 in KIO::Connection::readyRead (this=0xa132b08)
    at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/connection.moc:84
#27 0xb53c29c9 in KIO::ConnectionPrivate::dequeue (this=0xa132b28)
    at /build/buildd/kde4libs-4.1.3/kio/kio/connection.cpp:82
#28 0xb53c2b56 in KIO::Connection::qt_metacall (this=0xa132b08, 
    _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xa2f4798)
    at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/connection.moc:72
#29 0xb7ef3bfb in QMetaCallEvent::placeMetaCall ()
   from /usr/lib/libQtCore.so.4
#30 0xb7ef5771 in QObject::event () from /usr/lib/libQtCore.so.4
#31 0xb67d48ec in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#32 0xb67dc72e in QApplication::notify () from /usr/lib/libQtGui.so.4
#33 0xb716bb2d in KApplication::notify (this=0xbfafcb68, receiver=0xa132b08, 
    event=0x9f56fc0)
    at /build/buildd/kde4libs-4.1.3/kdeui/kernel/kapplication.cpp:311
#34 0xb7ee5e61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#35 0xb7ee6ae5 in QCoreApplicationPrivate::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#36 0xb7ee6cdd in QCoreApplication::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#37 0xb7f1082f in ?? () from /usr/lib/libQtCore.so.4
#38 0xb639a6f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#39 0xb639dda3 in ?? () from /usr/lib/libglib-2.0.so.0
#40 0xb639df61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#41 0xb7f10478 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#42 0xb686eea5 in ?? () from /usr/lib/libQtGui.so.4
#43 0xb7ee452a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#44 0xb7ee46ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#45 0xb7ee6da5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#46 0xb67d4767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#47 0x0804a6c0 in main (argc=-1212760536, argv=0xa496b38)
    at /build/buildd/kdepim-4.1.3/kmail/main.cpp:146
#0  0xb7ffd430 in __kernel_vsyscall ()