Application that crashed: kmail
Version of the application: 1.12.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-20-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
After starting Kmail (with 3 online IMAP accounts), Kmail always ends with a segfault after ~ 2 secs (probably at opening a folder or message). I'm sorry that I have absolutely no time to study the backtrace at the moment, I will provide further details later.

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7706aa0 (LWP 6212))]

Thread 2 (Thread 0xb16e1b70 (LWP 6217)):
#0  0x00e70422 in __kernel_vsyscall ()
#1  0x0748e142 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x016f38d4 in pthread_cond_timedwait () from /lib/tls/i686/cmov/libc.so.6
#3  0x00c10def in QWaitConditionPrivate::wait (this=0x9f61260, mutex=0x9f6125c, time=30000) at thread/qwaitcondition_unix.cpp:85
#4  QWaitCondition::wait (this=0x9f61260, mutex=0x9f6125c, time=30000) at thread/qwaitcondition_unix.cpp:159
#5  0x00c059ae in QThreadPoolThread::run (this=0x9f59210) at concurrent/qthreadpool.cpp:140
#6  0x00c0fe32 in QThreadPrivate::start (arg=0x9f59210) at thread/qthread_unix.cpp:188
#7  0x0748980e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x016e68de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7706aa0 (LWP 6212)):
[KCrash Handler]
#6  QAbstractItemView::d_func (this=0x1) at itemviews/qabstractitemview.h:348
#7  QAbstractItemView::model (this=0x1) at itemviews/qabstractitemview.cpp:585
#8  0x06ac4f32 in QTreeWidgetItem::insertChild (this=0xa05d980, index=0, child=0xa1ef080) at itemviews/qtreewidget.cpp:1891
#9  0x06ac540d in QTreeWidgetItem::addChild (this=0xa05d980, child=0xa1ef080) at itemviews/qtreewidget.cpp:1876
#10 0x06ac5850 in QTreeWidgetItem (this=0xa1ef080, parent=0xa05d980, type=0) at itemviews/qtreewidget.cpp:1424
#11 0x01188194 in KMMimePartTreeItem (this=0xa1ef080, parent=0xa05d980, node=0xa18e550, description=..., mimetype=..., encoding=..., size=0, revertOrder=false) at ../../kmail/kmmimeparttree.cpp:378
#12 0x011cdbaa in partNode::fillMimePartTree (this=0xa18e550, parentItem=0xa05d980, mimePartTree=0x0, labelDescr=..., labelCntType=..., labelEncoding=..., size=0, revertOrder=<value optimized out>)
    at ../../kmail/partNode.cpp:496
#13 0x011ba82d in KMail::ObjectTreeParser::insertAndParseNewChildNode (this=0xbfa815b4, startNode=..., content=0xdf2398 "", cntDesc=0x14ec47d "encapsulated message", append=<value optimized out>)
    at ../../kmail/objecttreeparser.cpp:222
#14 0x011be857 in KMail::ObjectTreeParser::processMessageRfc822Subtype (this=0xbfa815b4, node=0x9f7b9e8) at ../../kmail/objecttreeparser.cpp:1426
#15 0x011c865b in process (this=0xa2e1778, otp=0xbfa815b4, node=0x9f7b9e8, result=...) at ../../kmail/bodypartformatter.cpp:116
#16 0x011b9e48 in KMail::ObjectTreeParser::parseObjectTree (this=0xbfa815b4, node=0x9f7b9e8) at ../../kmail/objecttreeparser.cpp:293
#17 0x011ba077 in KMail::ObjectTreeParser::stdChildHandling (this=0xbfa817e0, child=0x9f7b960) at ../../kmail/objecttreeparser.cpp:1143
#18 0x011ba3e1 in KMail::ObjectTreeParser::processMultiPartMixedSubtype (this=0xbfa817e0, node=0x9f7b8d8) at ../../kmail/objecttreeparser.cpp:1156
#19 0x011c861b in process (this=0xa20e520, otp=0xbfa817e0, node=0x9f7b8d8, result=...) at ../../kmail/bodypartformatter.cpp:118
#20 0x011b9e48 in KMail::ObjectTreeParser::parseObjectTree (this=0xbfa817e0, node=0x9f7b8d8) at ../../kmail/objecttreeparser.cpp:293
#21 0x0101de67 in KMReaderWin::parseMsg (this=0x97e4140, aMsg=0xa13bf50) at ../../kmail/kmreaderwin.cpp:1672
#22 0x0100b4d9 in KMReaderWin::displayMessage (this=0x97e4140) at ../../kmail/kmreaderwin.cpp:1605
#23 0x0100b6cb in KMReaderWin::updateReaderWin (this=0x97e4140) at ../../kmail/kmreaderwin.cpp:1545
#24 0x01015798 in KMReaderWin::update (this=0x97e4140, observable=0x1) at ../../kmail/kmreaderwin.cpp:947
#25 0x0126ead2 in KMail::ISubject::notify (this=0xa13bfc0) at ../../kmail/isubject.cpp:30
#26 0x00f0ce62 in KMMessage::updateBodyPart (this=0xa13bf50, partSpecifier=..., data=...) at ../../kmail/kmmessage.cpp:3235
#27 0x0123fdd0 in KMail::ImapJob::slotGetMessageResult (this=0xa0faef0, job=0xa142c40) at ../../kmail/imapjob.cpp:435
#28 0x0124460f in KMail::ImapJob::qt_metacall (this=0xa0faef0, _c=QMetaObject::InvokeMetaMethod, _id=12, _a=0xbfa81d68) at ./imapjob.moc:82
#29 0x00d16263 in QMetaObject::activate (sender=0xa142c40, from_signal_index=7, to_signal_index=7, argv=0xbfa81d68) at kernel/qobject.cpp:3113
#30 0x00d16ec2 in QMetaObject::activate (sender=0xa142c40, m=0x34fd68, local_signal_index=3, argv=0xbfa81d68) at kernel/qobject.cpp:3187
#31 0x001e9fe3 in KJob::result (this=0xa142c40, _t1=0xa142c40) at ./kjob.moc:188
#32 0x001ea469 in KJob::emitResult (this=0xa142c40) at ../../kdecore/jobs/kjob.cpp:304
#33 0x01fec660 in KIO::SimpleJob::slotFinished (this=0xa142c40) at ../../kio/kio/job.cpp:477
#34 0x01fecb7a in KIO::TransferJob::slotFinished (this=0xa142c40) at ../../kio/kio/job.cpp:948
#35 0x01fea8a3 in KIO::TransferJob::qt_metacall (this=0xa142c40, _c=QMetaObject::InvokeMetaMethod, _id=47, _a=0xbfa81fcc) at ./jobclasses.moc:343
#36 0x00d16263 in QMetaObject::activate (sender=0x98564b8, from_signal_index=8, to_signal_index=8, argv=0x0) at kernel/qobject.cpp:3113
#37 0x00d16ec2 in QMetaObject::activate (sender=0x98564b8, m=0x219ef64, local_signal_index=4, argv=0x0) at kernel/qobject.cpp:3187
#38 0x020b6557 in KIO::SlaveInterface::finished (this=0x98564b8) at ./slaveinterface.moc:165
#39 0x020ba44d in KIO::SlaveInterface::dispatch (this=0x98564b8, _cmd=104, rawdata=...) at ../../kio/kio/slaveinterface.cpp:175
#40 0x020b6a13 in KIO::SlaveInterface::dispatch (this=0x98564b8) at ../../kio/kio/slaveinterface.cpp:91
#41 0x020a8aea in KIO::Slave::gotInput (this=0x98564b8) at ../../kio/kio/slave.cpp:322
#42 0x020aaee3 in KIO::Slave::qt_metacall (this=0x98564b8, _c=QMetaObject::InvokeMetaMethod, _id=30, _a=0xbfa822ac) at ./slave.moc:76
#43 0x00d16263 in QMetaObject::activate (sender=0x9f775b8, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#44 0x00d16ec2 in QMetaObject::activate (sender=0x9f775b8, m=0x219b8a0, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#45 0x01fb2f97 in KIO::Connection::readyRead (this=0x9f775b8) at ./connection.moc:86
#46 0x01fb4d5e in KIO::ConnectionPrivate::dequeue (this=0x9f752e8) at ../../kio/kio/connection.cpp:82
#47 0x01fb4e8e in KIO::Connection::qt_metacall (this=0x9f775b8, _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0xa1e7160) at ./connection.moc:73
#48 0x00d0ef0b in QMetaCallEvent::placeMetaCall (this=0xa1fb328, object=0x9f775b8) at kernel/qobject.cpp:477
#49 0x00d105fe in QObject::event (this=0x9f775b8, e=0xa1fb328) at kernel/qobject.cpp:1111
#50 0x064f8f54 in QApplicationPrivate::notify_helper (this=0x968b440, receiver=0x9f775b8, e=0xa1fb328) at kernel/qapplication.cpp:4056
#51 0x0650067c in QApplication::notify (this=0xbfa82be0, receiver=0x9f775b8, e=0xa1fb328) at kernel/qapplication.cpp:3603
#52 0x007febfa in KApplication::notify (this=0xbfa82be0, receiver=0x9f775b8, event=0xa1fb328) at ../../kdeui/kernel/kapplication.cpp:302
#53 0x00d006cb in QCoreApplication::notifyInternal (this=0xbfa82be0, receiver=0x9f775b8, event=0xa1fb328) at kernel/qcoreapplication.cpp:610
#54 0x00d012b2 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x95f8fa8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#55 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x95f8fa8) at kernel/qcoreapplication.cpp:1247
#56 0x00d0147d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#57 0x00d2b3ff in QCoreApplication::sendPostedEvents (s=0x9621890) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#58 postEventSourceDispatch (s=0x9621890) at kernel/qeventdispatcher_glib.cpp:210
#59 0x02b24e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#60 0x02b28730 in ?? () from /lib/libglib-2.0.so.0
#61 0x02b28863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#62 0x00d2b02c in QEventDispatcherGlib::processEvents (this=0x9689658, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#63 0x06599be5 in QGuiEventDispatcherGlib::processEvents (this=0x9689658, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#64 0x00cfec79 in QEventLoop::processEvents (this=0xbfa82aa4, flags=) at kernel/qeventloop.cpp:149
#65 0x00cff0ca in QEventLoop::exec (this=0xbfa82aa4, flags=...) at kernel/qeventloop.cpp:201
#66 0x00d0153f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#67 0x064f8dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#68 0x0804a702 in main (argc=3, argv=0xbfa82d94) at ../../kmail/main.cpp:146

Reported using DrKonqi