Version:            (using KDE KDE 3.5.5)
Installed from:    Ubuntu Packages

After I've started KMail it fetched new mails from IMAP, started sorting them (downloading and re-uploading) and then hung in an infinite loop.

I've attached gdb and it produced this backtrace:
[Switching to Thread -1248635216 (LWP 14107)]
0xb72430b2 in QListViewItem::takeItem () from /usr/lib/libqt-mt.so.3
(gdb) bt
#0  0xb72430b2 in QListViewItem::takeItem () from /usr/lib/libqt-mt.so.3
#1  0xb5f204cc in KListViewItem::takeItem () from /usr/lib/libkdeui.so.4
#2  0xb7232686 in QListViewItem::~QListViewItem () from /usr/lib/libqt-mt.so.3
#3  0xb5f2060d in KListViewItem::~KListViewItem () from /usr/lib/libkdeui.so.4
#4  0xb7cc0e51 in KMail::HeaderItem::~HeaderItem ()
   from /usr/lib/libkmailprivate.so
#5  0xb7cae94e in KMHeaders::msgRemoved () from /usr/lib/libkmailprivate.so
#6  0xb7cb9f39 in KMHeaders::qt_invoke () from /usr/lib/libkmailprivate.so
#7  0xb7139957 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#8  0xb7ce8fd0 in KMFolder::msgRemoved () from /usr/lib/libkmailprivate.so
#9  0xb7ce9c8d in KMFolder::qt_emit () from /usr/lib/libkmailprivate.so
#10 0xb713992b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#11 0xb7d06bd0 in FolderStorage::msgRemoved () from /usr/lib/libkmailprivate.so
#12 0xb7d08242 in FolderStorage::removeMsg () from /usr/lib/libkmailprivate.so
#13 0xb7d96f8b in KMFolderImap::removeMsg () from /usr/lib/libkmailprivate.so
#14 0xb7ce7976 in KMFolder::removeMsg () from /usr/lib/libkmailprivate.so
#15 0xb7e3266c in KMMoveCommand::execute () from /usr/lib/libkmailprivate.so
#16 0xb7e24949 in KMCommand::slotPostTransfer ()
   from /usr/lib/libkmailprivate.so
#17 0xb7e2c386 in KMCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#18 0xb7e2c66b in KMMenuCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#19 0xb7e2c6f7 in KMMoveCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#20 0xb7139957 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
---Type <return> to continue, or q <return> to quit---
#21 0xb7e249de in KMCommand::messagesTransfered ()
   from /usr/lib/libkmailprivate.so
#22 0xb7e2d241 in KMCommand::transferSelectedMsgs ()
   from /usr/lib/libkmailprivate.so
#23 0xb7e2d3a7 in KMCommand::slotStart () from /usr/lib/libkmailprivate.so
#24 0xb7e2c398 in KMCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#25 0xb7e2c66b in KMMenuCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#26 0xb7e2c6f7 in KMMoveCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#27 0xb7139957 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#28 0xb74c5f44 in QSignal::signal () from /usr/lib/libqt-mt.so.3
#29 0xb71598ea in QSignal::activate () from /usr/lib/libqt-mt.so.3
#30 0xb7161300 in QSingleShotTimer::event () from /usr/lib/libqt-mt.so.3
#31 0xb70d0b88 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#32 0xb70d29b7 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#33 0xb77f9db2 in KApplication::notify () from /usr/lib/libkdecore.so.4
#34 0xb7063389 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#35 0xb70c35d3 in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#36 0xb7077ec5 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#37 0xb70eb25e in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#38 0xb70eb06e in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#39 0xb70d2731 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#40 0x0804a0fe in ?? ()
#41 0xbf835234 in ?? ()
---Type <return> to continue, or q <return> to quit---
#42 0xbf83522c in ?? ()
#43 0x00000000 in ?? ()