Application: kmail (1.13.7)
KDE Platform Version: 4.6.3 (4.6.3)
Qt Version: 4.7.3
Operating System: Linux 2.6.38-ARCH i686
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:
First I delete spam into the trash folder. 
Than i empty the trash (there is an unread messages).
- Unusual behavior I noticed:

- Custom settings of the application:
IMAP server, bogofilter enabled

The crash can be reproduced every time.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[Current thread is 1 (Thread 0xb2296710 (LWP 14314))]

Thread 2 (Thread 0xad768b70 (LWP 14334)):
#0  0xb77be424 in __kernel_vsyscall ()
#1  0xb5682bd3 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb5bc0724 in pthread_cond_timedwait () from /lib/libc.so.6
#3  0xb5db4cde in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0xb5da8b54 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb5db4843 in ?? () from /usr/lib/libQtCore.so.4
#6  0xb567ec77 in start_thread () from /lib/libpthread.so.0
#7  0xb5bb2c6e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb2296710 (LWP 14314)):
[KCrash Handler]
#7  0x00000000 in ?? ()
#8  0xb6dca5f7 in ?? () from /usr/lib/libkmailprivate.so.4
#9  0xb6dcb61b in ?? () from /usr/lib/libkmailprivate.so.4
#10 0xb5eb54cd in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
#11 0xb5ec428a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#12 0xb71b5285 in KJob::infoMessage(KJob*, QString const&, QString const&) () from /usr/lib/libkdecore.so.5
#13 0xb53db199 in ?? () from /usr/lib/libkio.so.5
#14 0xb53dec96 in KIO::SimpleJob::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#15 0xb53e1e52 in KIO::TransferJob::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#16 0xb5eb54cd in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
#17 0xb5ec428a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#18 0xb54950f5 in KIO::SlaveInterface::infoMessage(QString const&) () from /usr/lib/libkio.so.5
#19 0xb54975a3 in KIO::SlaveInterface::dispatch(int, QByteArray const&) () from /usr/lib/libkio.so.5
#20 0xb5493f7a in KIO::SlaveInterface::dispatch() () from /usr/lib/libkio.so.5
#21 0xb5485da8 in KIO::Slave::gotInput() () from /usr/lib/libkio.so.5
#22 0xb54864dc in KIO::Slave::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#23 0xb5eb54cd in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
#24 0xb5ec428a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#25 0xb53a6635 in KIO::Connection::readyRead() () from /usr/lib/libkio.so.5
#26 0xb53a6e6a in ?? () from /usr/lib/libkio.so.5
#27 0xb53a6f3f in KIO::Connection::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#28 0xb5eb54cd in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
#29 0xb5ebfe85 in QMetaCallEvent::placeMetaCall(QObject*) () from /usr/lib/libQtCore.so.4
#30 0xb5ec736f in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#31 0xb6113084 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#32 0xb6118432 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#33 0xb7556ed1 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#34 0xb5eaf0de in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#35 0xb5eb2838 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#36 0xb5eb29fc in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#37 0xb5edce84 in ?? () from /usr/lib/libQtCore.so.4
#38 0xb3d7aeff in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#39 0xb3d7b660 in ?? () from /usr/lib/libglib-2.0.so.0
#40 0xb3d7b98a in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#41 0xb5edd2b7 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#42 0xb61c67ea in ?? () from /usr/lib/libQtGui.so.4
#43 0xb5eae11d in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#44 0xb5eae361 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#45 0xb5eb2aaa in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#46 0xb6110ed4 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#47 0x0804a322 in ?? ()
#48 0xb5afc103 in __libc_start_main () from /lib/libc.so.6
#49 0x0804a7b1 in _start ()

Reported using DrKonqi