Version:           3.5.9 (using KDE 3.5.9)
Installed from:    Debian testing/unstable Packages

Kmail uses to have this failure on IMAP folders: sometimes it starts showing each message several times. To operate in any of them causes Kmail to crash.

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Using host libthread_db library "/lib/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread 0xb5822b70 (LWP 19845)]
[New Thread 0xb3a85b90 (LWP 19849)]
[New Thread 0xb4286b90 (LWP 19848)]
[New Thread 0xb4a87b90 (LWP 19847)]
[New Thread 0xb5288b90 (LWP 19846)]
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[KCrash handler]
#6  0xb7c120cf in KMFolder::open () from /usr/lib/libkmailprivate.so
#7  0xb7d6aadf in KMCommand::keepFolderOpen ()
   from /usr/lib/libkmailprivate.so
#8  0xb7d75f03 in KMCommand::slotStart () from /usr/lib/libkmailprivate.so
#9  0xb7d74ba7 in KMCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#10 0xb7d751ab in KMFilterActionCommand::qt_invoke ()
   from /usr/lib/libkmailprivate.so
#11 0xb7069f6d in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#12 0xb739405e in QSignal::signal () from /usr/lib/libqt-mt.so.3
#13 0xb70858c7 in QSignal::activate () from /usr/lib/libqt-mt.so.3
#14 0xb708c993 in QSingleShotTimer::event () from /usr/lib/libqt-mt.so.3
#15 0xb700c18a in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#16 0xb700cf76 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#17 0xb76bcec2 in KApplication::notify () from /usr/lib/libkdecore.so.4
#18 0xb700156e in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#19 0xb6fbb348 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#20 0xb7022b80 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#21 0xb7022a16 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#22 0xb700bcff in QApplication::exec () from /usr/lib/libqt-mt.so.3
#23 0x0804a2ed in ?? ()
#24 0xbfddfdb0 in ?? ()
#25 0xbfddffa0 in ?? ()
#26 0x00000000 in ?? ()