Version:            (using KDE KDE 3.3.1)
Installed from:    RedHat RPMs
OS:                Linux

Kmail crashed on me while I was writing a message.
Sorry I can't describe how to reproduce, but I really wasn't doing anything peculiar - I wasn't even typing, I was just moving the cursor between the lines to proof-read the message. I'm attaching the crash dump.
The setup I'm using is the following: 3 pop + 1 imap accounts. The pop accounts are set for periodic checking.


[New Thread 16384 (LWP 28305)]
[KCrash handler]
#4  0x41987ed4 in QObject::receivers(int) const ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#5  0x40a2c988 in KPIM::ProgressItem::progressItemProgress(KPIM::ProgressItem*, unsigned) () from /usr/lib/libkdepim.so.1
#6  0x40a2bf0d in KPIM::ProgressItem::setProgress(unsigned) ()
   from /usr/lib/libkdepim.so.1
#7  0x402d5f34 in KMAcctExpPop::slotJobFinished() ()
   from /usr/lib/libkmailprivate.so.0
#8  0x402d8f7e in KMAcctExpPop::slotResult(KIO::Job*) ()
   from /usr/lib/libkmailprivate.so.0
#9  0x402d93c7 in KMAcctExpPop::qt_invoke(int, QUObject*) ()
   from /usr/lib/libkmailprivate.so.0
#10 0x41989ffc in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#11 0x40f3717a in KIO::Job::result(KIO::Job*) () from /usr/lib/libkio.so.4
#12 0x40f203fc in KIO::Job::emitResult() () from /usr/lib/libkio.so.4
#13 0x40f218fc in KIO::SimpleJob::slotFinished() () from /usr/lib/libkio.so.4
#14 0x40f24d4e in KIO::TransferJob::slotFinished() () from /usr/lib/libkio.so.4
#15 0x40f3915d in KIO::TransferJob::qt_invoke(int, QUObject*) ()
   from /usr/lib/libkio.so.4
#16 0x41989ffc in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#17 0x41989e24 in QObject::activate_signal(int) ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#18 0x40f1466e in KIO::SlaveInterface::finished() () from /usr/lib/libkio.so.4
#19 0x40f13269 in KIO::SlaveInterface::dispatch(int, QMemArray<char> const&) ()
   from /usr/lib/libkio.so.4
#20 0x40f12789 in KIO::SlaveInterface::dispatch() () from /usr/lib/libkio.so.4
#21 0x40f0ffeb in KIO::Slave::gotInput() () from /usr/lib/libkio.so.4
#22 0x40f11d08 in KIO::Slave::qt_invoke(int, QUObject*) ()
   from /usr/lib/libkio.so.4
#23 0x41989ffc in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#24 0x4198a15d in QObject::activate_signal(int, int) ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#25 0x41ccb1f2 in QSocketNotifier::activated(int) ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#26 0x419a6770 in QSocketNotifier::event(QEvent*) ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#27 0x4192daff in QApplication::internalNotify(QObject*, QEvent*) ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#28 0x4192d0fe in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#29 0x41506273 in KApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/libkdecore.so.4
#30 0x4191d5ba in QEventLoop::activateSocketNotifiers() ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#31 0x418d7d13 in QEventLoop::processEvents(unsigned) ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#32 0x4193fd48 in QEventLoop::enterLoop() ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#33 0x4193fbf8 in QEventLoop::exec() () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#34 0x4192dd51 in QApplication::exec() ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#35 0x0804a2e4 in QObject::checkConnectArgs(char const*, QObject const*, char const*) ()
#36 0x42074f55 in __libc_start_main () from /lib/libc.so.6