Version:           1.9.1 (using KDE 3.5.1, Debian Package 4:3.5.1-4 (testing/unstable))
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.15.6-kanotix-1

I had a crash when I emptied the trash folder of my dimap-account. I noticed to late, but at the same time Kmail was updating the trash-folder during email check (I have a slow modem connection). Here is the backtrace:
Using host libthread_db library "/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1249002976 (LWP 14641)]
[New Thread -1280746576 (LWP 14683)]
[New Thread -1272357968 (LWP 14682)]
[New Thread -1263969360 (LWP 14681)]
[New Thread -1255580752 (LWP 14680)]
[KCrash handler]
#5  0x00000000 in ?? ()
#6  0xb7e1bf07 in KMail::CachedImapJob::slotPutMessageInfoData (
    this=0x9822de8, job=0x9fce3a0, data=@0x9c933c0)
    at /tmp/buildd/kdepim-3.5.1/build-tree/kdepim-3.5.1/kmail/cachedimapjob.cpp:437
#7  0xb7e1d061 in KMail::CachedImapJob::qt_invoke (this=0x9822de8, _id=9, 
    _o=0xbf9a23f0) at cachedimapjob.moc:160
#8  0xb70ea7ff in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#9  0xb5b176ef in KIO::Job::infoMessage (this=0xa037800, t0=0x9fce3a0, 
    t1=@0x9fce3a0) at jobclasses.moc:189
#10 0xb5b17748 in KIO::SimpleJob::slotInfoMessage (this=0x9f19058, 
    msg=@0x9fce3a0) at job.cpp:609
#11 0xb5b6d6b0 in KIO::SimpleJob::qt_invoke (this=0xa037800, _id=9, 
    _o=0xbf9a2548) at jobclasses.moc:419
#12 0xb5b6d743 in KIO::TransferJob::qt_invoke (this=0xa037800, _id=9, 
    _o=0xbf9a2548) at jobclasses.moc:1082
#13 0xb70ea7ff in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#14 0xb70ead2c in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#15 0xb5b310c3 in KIO::SlaveInterface::infoMessage (this=0x9fce3a0, 
    t0=@0x9fce3a0) at slaveinterface.moc:382
#16 0xb5b83180 in KIO::SlaveInterface::dispatch (this=0x9c00d90, _cmd=26, 
    rawdata=@0xbf9a2770) at slaveinterface.cpp:369
#17 0xb5b2a9c7 in KIO::SlaveInterface::dispatch (this=0x9c00d90)
    at slaveinterface.cpp:173
#18 0xb5b2f8db in KIO::Slave::gotInput (this=0x9c00d90) at slave.cpp:300
#19 0xb5b2fa8b in KIO::Slave::qt_invoke (this=0x9c00d90, _id=4, _o=0xbf9a2898)
    at slave.moc:113
#20 0xb70ea7ff in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#21 0xb70eb106 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#22 0xb74791f7 in QSocketNotifier::activated () from /usr/lib/libqt-mt.so.3
#23 0xb710aaaa in QSocketNotifier::event () from /usr/lib/libqt-mt.so.3
#24 0xb7081122 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#25 0xb7081314 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#26 0xb7784fde in KApplication::notify (this=0xbf9a2e78, receiver=0x9e9e9a8, 
    event=0xbf9a2bf0) at kapplication.cpp:550
#27 0xb7012861 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#28 0xb7072cdd in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/libqt-mt.so.3
#29 0xb7026542 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#30 0xb7099b01 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#31 0xb7099a26 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#32 0xb707fc35 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#33 0x0804a098 in main (argc=167568288, argv=0x9fce3a0)
    at /tmp/buildd/kdepim-3.5.1/build-tree/kdepim-3.5.1/kmail/main.cpp:110
#34 0xb784a001 in __libc_start_main () from /lib/tls/libc.so.6
#35 0x08049e11 in _start () at ../sysdeps/i386/elf/start.S:119